From bf084cb04c7024d438b9919223e0f4752a0edf14 Mon Sep 17 00:00:00 2001
From: Janice Collins <jcollins@google.com>
Date: Wed, 27 Oct 2021 10:51:18 -0700
Subject: [PATCH 1/5] squash from chain merges

---
 .../templates.runtime_renderers.dart          | 3591 ++++++++++-------
 lib/src/mustachio/renderer_base.dart          |    6 +-
 test/mustachio/foo.dart                       |   34 +-
 test/mustachio/foo.runtime_renderers.dart     |  155 +-
 .../runtime_renderer_builder_test.dart        |   16 +-
 .../runtime_renderer_render_test.dart         |    6 +-
 tool/mustachio/codegen_runtime_renderer.dart  |   40 +-
 7 files changed, 2326 insertions(+), 1522 deletions(-)

diff --git a/lib/src/generator/templates.runtime_renderers.dart b/lib/src/generator/templates.runtime_renderers.dart
index 56508a6a6f..87c9ba1f86 100644
--- a/lib/src/generator/templates.runtime_renderers.dart
+++ b/lib/src/generator/templates.runtime_renderers.dart
@@ -6,7 +6,6 @@
 // ignore_for_file: camel_case_types, deprecated_member_use_from_same_package
 // ignore_for_file: non_constant_identifier_names, unnecessary_string_escapes
 // ignore_for_file: unused_import
-// @dart=2.9
 import 'package:dartdoc/src/element_type.dart';
 import 'package:dartdoc/src/generator/template_data.dart';
 import 'package:dartdoc/src/model/annotation.dart';
@@ -22,14 +21,14 @@ import 'package:dartdoc/src/mustachio/renderer_base.dart';
 import 'package:dartdoc/src/warnings.dart';
 import 'templates.dart';
 
-void _render_Accessor(Accessor context, List<MustachioNode> ast,
+void _render_Accessor(Accessor? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Accessor(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Accessor extends RendererBase<Accessor> {
+class _Renderer_Accessor extends RendererBase<Accessor?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Accessor>() =>
       _propertyMapCache.putIfAbsent(
@@ -47,7 +46,7 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'definingCombo': Property(
@@ -60,15 +59,17 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty = _Renderer_GetterSetterCombo.propertyMap()
                         .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as GetterSetterCombo,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.definingCombo == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.definingCombo, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['GetterSetterCombo']);
+                        getters: _invisibleGetters['GetterSetterCombo']!);
                   },
                 ),
                 'documentationComment': Property(
@@ -81,8 +82,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationComment == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -103,7 +106,7 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['PropertyAccessorElement']);
+                        getters: _invisibleGetters['PropertyAccessorElement']!);
                   },
                 ),
                 'enclosingCombo': Property(
@@ -116,15 +119,17 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty = _Renderer_GetterSetterCombo.propertyMap()
                         .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as GetterSetterCombo,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingCombo == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.enclosingCombo, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['GetterSetterCombo']);
+                        getters: _invisibleGetters['GetterSetterCombo']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -137,8 +142,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -158,8 +165,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -185,8 +194,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -232,8 +243,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -241,6 +254,28 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
                   },
                 ),
+                'library': Property(
+                  getValue: (CT_ c) => c.library,
+                  renderVariable:
+                      (CT_ c, Property<CT_> self, List<String> remainingNames) {
+                    if (remainingNames.isEmpty) {
+                      return self.getValue(c).toString();
+                    }
+                    var name = remainingNames.first;
+                    var nextProperty =
+                        _Renderer_Library.propertyMap().getValue(name);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
+                  },
+                  isNullValue: (CT_ c) => c.library == null,
+                  renderValue: (CT_ c, RendererBase<CT_> r,
+                      List<MustachioNode> ast, StringSink sink) {
+                    _render_Library(c.library, ast, r.template, sink,
+                        parent: r);
+                  },
+                ),
                 'modelType': Property(
                   getValue: (CT_ c) => c.modelType,
                   renderVariable:
@@ -251,8 +286,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Callable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Callable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -271,8 +308,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.namePart == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -292,7 +331,7 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.originalMember, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ExecutableMember']);
+                        getters: _invisibleGetters['ExecutableMember']!);
                   },
                 ),
                 'referenceChildren': Property(
@@ -305,7 +344,7 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -319,7 +358,7 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'sourceCode': Property(
@@ -332,8 +371,10 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sourceCode == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -342,14 +383,14 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Accessor(Accessor context, RendererBase<Object> parent,
+  _Renderer_Accessor(Accessor? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Accessor> getProperty(String key) {
+  Property<Accessor?>? getProperty(String key) {
     if (propertyMap<Accessor>().containsKey(key)) {
       return propertyMap<Accessor>()[key];
     } else {
@@ -358,14 +399,14 @@ class _Renderer_Accessor extends RendererBase<Accessor> {
   }
 }
 
-void _render_Annotation(Annotation context, List<MustachioNode> ast,
+void _render_Annotation(Annotation? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Annotation(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Annotation extends RendererBase<Annotation> {
+class _Renderer_Annotation extends RendererBase<Annotation?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Annotation>() =>
       _propertyMapCache.putIfAbsent(
@@ -384,7 +425,7 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.annotation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ElementAnnotation']);
+                        getters: _invisibleGetters['ElementAnnotation']!);
                   },
                 ),
                 'hashCode': Property(
@@ -396,7 +437,7 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'isPublic': Property(
@@ -416,8 +457,10 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -436,8 +479,10 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -456,8 +501,10 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedNameWithParameters == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -477,8 +524,10 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -497,7 +546,7 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
                 'parameterText': Property(
@@ -510,8 +559,10 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.parameterText == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -520,14 +571,14 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Annotation(Annotation context, RendererBase<Object> parent,
+  _Renderer_Annotation(Annotation? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Annotation> getProperty(String key) {
+  Property<Annotation?>? getProperty(String key) {
     if (propertyMap<Annotation>().containsKey(key)) {
       return propertyMap<Annotation>()[key];
     } else {
@@ -536,14 +587,14 @@ class _Renderer_Annotation extends RendererBase<Annotation> {
   }
 }
 
-void _render_Callable(Callable context, List<MustachioNode> ast,
+void _render_Callable(Callable? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Callable(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Callable extends RendererBase<Callable> {
+class _Renderer_Callable extends RendererBase<Callable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Callable>() =>
       _propertyMapCache.putIfAbsent(
@@ -559,8 +610,10 @@ class _Renderer_Callable extends RendererBase<Callable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -591,8 +644,10 @@ class _Renderer_Callable extends RendererBase<Callable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.returnType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -611,17 +666,17 @@ class _Renderer_Callable extends RendererBase<Callable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.type, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['FunctionType']);
+                        parent: r, getters: _invisibleGetters['FunctionType']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Callable(Callable context, RendererBase<Object> parent,
+  _Renderer_Callable(Callable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Callable> getProperty(String key) {
+  Property<Callable?>? getProperty(String key) {
     if (propertyMap<Callable>().containsKey(key)) {
       return propertyMap<Callable>()[key];
     } else {
@@ -630,7 +685,7 @@ class _Renderer_Callable extends RendererBase<Callable> {
   }
 }
 
-class _Renderer_Canonicalization extends RendererBase<Canonicalization> {
+class _Renderer_Canonicalization extends RendererBase<Canonicalization?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends Canonicalization>() =>
@@ -648,8 +703,10 @@ class _Renderer_Canonicalization extends RendererBase<Canonicalization> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.canonicalLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -668,7 +725,7 @@ class _Renderer_Canonicalization extends RendererBase<Canonicalization> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'isCanonical': Property(
@@ -690,14 +747,14 @@ class _Renderer_Canonicalization extends RendererBase<Canonicalization> {
                         _render_String(e, ast, r.template, sink, parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Canonicalization(Canonicalization context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_Canonicalization(Canonicalization? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Canonicalization> getProperty(String key) {
+  Property<Canonicalization?>? getProperty(String key) {
     if (propertyMap<Canonicalization>().containsKey(key)) {
       return propertyMap<Canonicalization>()[key];
     } else {
@@ -706,7 +763,7 @@ class _Renderer_Canonicalization extends RendererBase<Canonicalization> {
   }
 }
 
-class _Renderer_Categorization extends RendererBase<Categorization> {
+class _Renderer_Categorization extends RendererBase<Categorization?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Categorization>() =>
       _propertyMapCache.putIfAbsent(
@@ -735,7 +792,7 @@ class _Renderer_Categorization extends RendererBase<Categorization> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.categoryNames, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'displayedCategories': Property(
@@ -795,8 +852,10 @@ class _Renderer_Categorization extends RendererBase<Categorization> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.image == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -814,8 +873,10 @@ class _Renderer_Categorization extends RendererBase<Categorization> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.samples == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -833,17 +894,17 @@ class _Renderer_Categorization extends RendererBase<Categorization> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.subCategoryNames, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Categorization(Categorization context, RendererBase<Object> parent,
-      Template template, StringSink sink)
+  _Renderer_Categorization(Categorization? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Categorization> getProperty(String key) {
+  Property<Categorization?>? getProperty(String key) {
     if (propertyMap<Categorization>().containsKey(key)) {
       return propertyMap<Categorization>()[key];
     } else {
@@ -852,14 +913,14 @@ class _Renderer_Categorization extends RendererBase<Categorization> {
   }
 }
 
-void _render_Category(Category context, List<MustachioNode> ast,
+void _render_Category(Category? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Category(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Category extends RendererBase<Category> {
+class _Renderer_Category extends RendererBase<Category?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Category>() =>
       _propertyMapCache.putIfAbsent(
@@ -885,8 +946,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.canonicalLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -906,7 +969,7 @@ class _Renderer_Category extends RendererBase<Category> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.categoryDefinition, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CategoryDefinition']);
+                        getters: _invisibleGetters['CategoryDefinition']!);
                   },
                 ),
                 'categoryIndex': Property(
@@ -918,7 +981,7 @@ class _Renderer_Category extends RendererBase<Category> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.categoryIndex, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'categoryLabel': Property(
@@ -931,8 +994,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.categoryLabel == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -963,7 +1028,7 @@ class _Renderer_Category extends RendererBase<Category> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'config': Property(
@@ -977,7 +1042,7 @@ class _Renderer_Category extends RendererBase<Category> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DartdocOptionContext']);
+                        getters: _invisibleGetters['DartdocOptionContext']!);
                   },
                 ),
                 'constants': Property(
@@ -1014,7 +1079,7 @@ class _Renderer_Category extends RendererBase<Category> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentationFile, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['File']);
+                        parent: r, getters: _invisibleGetters['File']!);
                   },
                 ),
                 'documentationFrom': Property(
@@ -1027,7 +1092,7 @@ class _Renderer_Category extends RendererBase<Category> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.documentationFrom.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Locatable']));
+                        parent: r, getters: _invisibleGetters['Locatable']!));
                   },
                 ),
                 'documentedWhere': Property(
@@ -1041,7 +1106,7 @@ class _Renderer_Category extends RendererBase<Category> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentedWhere, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DocumentLocation']);
+                        getters: _invisibleGetters['DocumentLocation']!);
                   },
                 ),
                 'element': Property(
@@ -1053,7 +1118,7 @@ class _Renderer_Category extends RendererBase<Category> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Element']);
+                        parent: r, getters: _invisibleGetters['Element']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -1066,14 +1131,16 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Warnable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Warnable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.enclosingElement, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Warnable']);
+                        parent: r, getters: _invisibleGetters['Warnable']!);
                   },
                 ),
                 'enclosingName': Property(
@@ -1086,8 +1153,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1142,8 +1211,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1162,8 +1233,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1195,8 +1268,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1228,8 +1303,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1247,8 +1324,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1279,8 +1358,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1298,8 +1379,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1318,7 +1401,7 @@ class _Renderer_Category extends RendererBase<Category> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
                 'properties': Property(
@@ -1344,7 +1427,7 @@ class _Renderer_Category extends RendererBase<Category> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -1358,7 +1441,7 @@ class _Renderer_Category extends RendererBase<Category> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'sortKey': Property(
@@ -1371,8 +1454,10 @@ class _Renderer_Category extends RendererBase<Category> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sortKey == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1392,14 +1477,14 @@ class _Renderer_Category extends RendererBase<Category> {
                         _render_Typedef(e, ast, r.template, sink, parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Category(Category context, RendererBase<Object> parent,
+  _Renderer_Category(Category? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Category> getProperty(String key) {
+  Property<Category?>? getProperty(String key) {
     if (propertyMap<Category>().containsKey(key)) {
       return propertyMap<Category>()[key];
     } else {
@@ -1408,22 +1493,22 @@ class _Renderer_Category extends RendererBase<Category> {
   }
 }
 
-String renderCategory(CategoryTemplateData context, Template template) {
+String renderCategory(CategoryTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_CategoryTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_CategoryTemplateData(CategoryTemplateData context,
+void _render_CategoryTemplateData(CategoryTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_CategoryTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_CategoryTemplateData
-    extends RendererBase<CategoryTemplateData> {
+    extends RendererBase<CategoryTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends CategoryTemplateData>() =>
@@ -1441,8 +1526,10 @@ class _Renderer_CategoryTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Category.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Category,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.category == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1461,8 +1548,10 @@ class _Renderer_CategoryTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1481,8 +1570,10 @@ class _Renderer_CategoryTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1501,8 +1592,10 @@ class _Renderer_CategoryTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1534,8 +1627,10 @@ class _Renderer_CategoryTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Category.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Category,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1553,8 +1648,10 @@ class _Renderer_CategoryTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1562,14 +1659,14 @@ class _Renderer_CategoryTemplateData
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_CategoryTemplateData(CategoryTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_CategoryTemplateData(CategoryTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<CategoryTemplateData> getProperty(String key) {
+  Property<CategoryTemplateData?>? getProperty(String key) {
     if (propertyMap<CategoryTemplateData>().containsKey(key)) {
       return propertyMap<CategoryTemplateData>()[key];
     } else {
@@ -1579,13 +1676,13 @@ class _Renderer_CategoryTemplateData
 }
 
 void _render_Class(
-    Class context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    Class? context, List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Class(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Class extends RendererBase<Class> {
+class _Renderer_Class extends RendererBase<Class?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Class>() =>
       _propertyMapCache.putIfAbsent(
@@ -1605,7 +1702,7 @@ class _Renderer_Class extends RendererBase<Class> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.allModelElements, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'constantFields': Property(
@@ -1630,8 +1727,10 @@ class _Renderer_Class extends RendererBase<Class> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1651,7 +1750,7 @@ class _Renderer_Class extends RendererBase<Class> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.extraReferenceChildren.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['MapEntry']));
+                        parent: r, getters: _invisibleGetters['MapEntry']!));
                   },
                 ),
                 'fileName': Property(
@@ -1664,8 +1763,10 @@ class _Renderer_Class extends RendererBase<Class> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1684,8 +1785,10 @@ class _Renderer_Class extends RendererBase<Class> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1704,8 +1807,10 @@ class _Renderer_Class extends RendererBase<Class> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullkind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1724,8 +1829,10 @@ class _Renderer_Class extends RendererBase<Class> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1789,8 +1896,10 @@ class _Renderer_Class extends RendererBase<Class> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1805,14 +1914,14 @@ class _Renderer_Class extends RendererBase<Class> {
                       self.renderSimpleVariable(c, remainingNames, 'bool'),
                   getBool: (CT_ c) => c.publicInheritedInstanceFields == true,
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Class(Class context, RendererBase<Object> parent, Template template,
-      StringSink sink)
+  _Renderer_Class(Class? context, RendererBase<Object>? parent,
+      Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Class> getProperty(String key) {
+  Property<Class?>? getProperty(String key) {
     if (propertyMap<Class>().containsKey(key)) {
       return propertyMap<Class>()[key];
     } else {
@@ -1821,20 +1930,20 @@ class _Renderer_Class extends RendererBase<Class> {
   }
 }
 
-String renderClass(ClassTemplateData context, Template template) {
+String renderClass(ClassTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_ClassTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_ClassTemplateData(ClassTemplateData context,
+void _render_ClassTemplateData(ClassTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_ClassTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_ClassTemplateData extends RendererBase<ClassTemplateData> {
+class _Renderer_ClassTemplateData extends RendererBase<ClassTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends ClassTemplateData>() =>
@@ -1853,8 +1962,10 @@ class _Renderer_ClassTemplateData extends RendererBase<ClassTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Class.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Class,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.clazz == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1862,14 +1973,14 @@ class _Renderer_ClassTemplateData extends RendererBase<ClassTemplateData> {
                     _render_Class(c.clazz, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ClassTemplateData(ClassTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ClassTemplateData(ClassTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ClassTemplateData> getProperty(String key) {
+  Property<ClassTemplateData?>? getProperty(String key) {
     if (propertyMap<ClassTemplateData>().containsKey(key)) {
       return propertyMap<ClassTemplateData>()[key];
     } else {
@@ -1878,7 +1989,7 @@ class _Renderer_ClassTemplateData extends RendererBase<ClassTemplateData> {
   }
 }
 
-class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
+class _Renderer_CommentReferable extends RendererBase<CommentReferable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends CommentReferable>() =>
@@ -1895,8 +2006,10 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_CommentReferable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as CommentReferable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.definingCommentReferable == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1904,7 +2017,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                     renderSimple(
                         c.definingCommentReferable, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']);
+                        getters: _invisibleGetters['CommentReferable']!);
                   },
                 ),
                 'href': Property(
@@ -1917,8 +2030,10 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1936,8 +2051,10 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -1956,7 +2073,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceGrandparentOverrides': Property(
@@ -1971,7 +2088,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
                         c.referenceGrandparentOverrides, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'referenceName': Property(
@@ -1984,8 +2101,10 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.referenceName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2005,7 +2124,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'scope': Property(
@@ -2017,17 +2136,17 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.scope, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Scope']);
+                        parent: r, getters: _invisibleGetters['Scope']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_CommentReferable(CommentReferable context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_CommentReferable(CommentReferable? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<CommentReferable> getProperty(String key) {
+  Property<CommentReferable?>? getProperty(String key) {
     if (propertyMap<CommentReferable>().containsKey(key)) {
       return propertyMap<CommentReferable>()[key];
     } else {
@@ -2036,7 +2155,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable> {
   }
 }
 
-class _Renderer_Constructable extends RendererBase<Constructable> {
+class _Renderer_Constructable extends RendererBase<Constructable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Constructable>() =>
       _propertyMapCache.putIfAbsent(
@@ -2065,8 +2184,10 @@ class _Renderer_Constructable extends RendererBase<Constructable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Constructor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Constructor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.defaultConstructor == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2086,7 +2207,7 @@ class _Renderer_Constructable extends RendererBase<Constructable> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.extraReferenceChildren.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['MapEntry']));
+                        parent: r, getters: _invisibleGetters['MapEntry']!));
                   },
                 ),
                 'hasPublicConstructors': Property(
@@ -2119,8 +2240,10 @@ class _Renderer_Constructable extends RendererBase<Constructable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Constructor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Constructor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.unnamedConstructor == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2130,14 +2253,14 @@ class _Renderer_Constructable extends RendererBase<Constructable> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Constructable(Constructable context, RendererBase<Object> parent,
+  _Renderer_Constructable(Constructable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Constructable> getProperty(String key) {
+  Property<Constructable?>? getProperty(String key) {
     if (propertyMap<Constructable>().containsKey(key)) {
       return propertyMap<Constructable>()[key];
     } else {
@@ -2146,14 +2269,14 @@ class _Renderer_Constructable extends RendererBase<Constructable> {
   }
 }
 
-void _render_Constructor(Constructor context, List<MustachioNode> ast,
+void _render_Constructor(Constructor? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Constructor(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Constructor extends RendererBase<Constructor> {
+class _Renderer_Constructor extends RendererBase<Constructor?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Constructor>() =>
       _propertyMapCache.putIfAbsent(
@@ -2173,7 +2296,7 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'element': Property(
@@ -2187,7 +2310,7 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ConstructorElement']);
+                        getters: _invisibleGetters['ConstructorElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -2200,8 +2323,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2221,8 +2346,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2241,8 +2368,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullKind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2261,8 +2390,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2309,8 +2440,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2328,8 +2461,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Callable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Callable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2348,8 +2483,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2367,8 +2504,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nameWithGenerics == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2387,7 +2526,7 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceName': Property(
@@ -2400,8 +2539,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.referenceName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2420,8 +2561,10 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.shortName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2443,14 +2586,14 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Constructor(Constructor context, RendererBase<Object> parent,
+  _Renderer_Constructor(Constructor? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Constructor> getProperty(String key) {
+  Property<Constructor?>? getProperty(String key) {
     if (propertyMap<Constructor>().containsKey(key)) {
       return propertyMap<Constructor>()[key];
     } else {
@@ -2459,22 +2602,22 @@ class _Renderer_Constructor extends RendererBase<Constructor> {
   }
 }
 
-String renderConstructor(ConstructorTemplateData context, Template template) {
+String renderConstructor(ConstructorTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_ConstructorTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_ConstructorTemplateData(ConstructorTemplateData context,
+void _render_ConstructorTemplateData(ConstructorTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_ConstructorTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_ConstructorTemplateData
-    extends RendererBase<ConstructorTemplateData> {
+    extends RendererBase<ConstructorTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends ConstructorTemplateData>() =>
@@ -2492,8 +2635,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Class.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Class,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.clazz == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2511,8 +2656,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Constructor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Constructor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.constructor == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2531,8 +2678,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.container == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2551,8 +2700,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2571,8 +2722,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2591,8 +2744,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2611,8 +2766,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2656,8 +2813,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Constructor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Constructor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2676,8 +2835,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2696,8 +2857,10 @@ class _Renderer_ConstructorTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2705,14 +2868,14 @@ class _Renderer_ConstructorTemplateData
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ConstructorTemplateData(ConstructorTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ConstructorTemplateData(ConstructorTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ConstructorTemplateData> getProperty(String key) {
+  Property<ConstructorTemplateData?>? getProperty(String key) {
     if (propertyMap<ConstructorTemplateData>().containsKey(key)) {
       return propertyMap<ConstructorTemplateData>()[key];
     } else {
@@ -2721,14 +2884,14 @@ class _Renderer_ConstructorTemplateData
   }
 }
 
-void _render_Container(Container context, List<MustachioNode> ast,
+void _render_Container(Container? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Container(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Container extends RendererBase<Container> {
+class _Renderer_Container extends RendererBase<Container?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Container>() =>
       _propertyMapCache.putIfAbsent(
@@ -2760,7 +2923,7 @@ class _Renderer_Container extends RendererBase<Container> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.allElements.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Element']));
+                        parent: r, getters: _invisibleGetters['Element']!));
                   },
                 ),
                 'allModelElements': Property(
@@ -2773,7 +2936,7 @@ class _Renderer_Container extends RendererBase<Container> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.allModelElements, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'constantFields': Property(
@@ -2798,7 +2961,7 @@ class _Renderer_Container extends RendererBase<Container> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.declaredFields, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'declaredMethods': Property(
@@ -2811,7 +2974,7 @@ class _Renderer_Container extends RendererBase<Container> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.declaredMethods, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'declaredOperators': Property(
@@ -2836,8 +2999,10 @@ class _Renderer_Container extends RendererBase<Container> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -2857,7 +3022,7 @@ class _Renderer_Container extends RendererBase<Container> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.extraReferenceChildren.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['MapEntry']));
+                        parent: r, getters: _invisibleGetters['MapEntry']!));
                   },
                 ),
                 'hasInstanceFields': Property(
@@ -3030,8 +3195,10 @@ class _Renderer_Container extends RendererBase<Container> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3050,8 +3217,10 @@ class _Renderer_Container extends RendererBase<Container> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3273,7 +3442,7 @@ class _Renderer_Container extends RendererBase<Container> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -3287,7 +3456,7 @@ class _Renderer_Container extends RendererBase<Container> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'scope': Property(
@@ -3299,7 +3468,7 @@ class _Renderer_Container extends RendererBase<Container> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.scope, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Scope']);
+                        parent: r, getters: _invisibleGetters['Scope']!);
                   },
                 ),
                 'staticAccessors': Property(
@@ -3350,14 +3519,14 @@ class _Renderer_Container extends RendererBase<Container> {
                         _render_Field(e, ast, r.template, sink, parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Container(Container context, RendererBase<Object> parent,
+  _Renderer_Container(Container? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Container> getProperty(String key) {
+  Property<Container?>? getProperty(String key) {
     if (propertyMap<Container>().containsKey(key)) {
       return propertyMap<Container>()[key];
     } else {
@@ -3366,14 +3535,14 @@ class _Renderer_Container extends RendererBase<Container> {
   }
 }
 
-void _render_ContainerAccessor(ContainerAccessor context,
+void _render_ContainerAccessor(ContainerAccessor? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_ContainerAccessor(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_ContainerAccessor extends RendererBase<ContainerAccessor> {
+class _Renderer_ContainerAccessor extends RendererBase<ContainerAccessor?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends ContainerAccessor>() =>
@@ -3394,7 +3563,7 @@ class _Renderer_ContainerAccessor extends RendererBase<ContainerAccessor> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -3407,8 +3576,10 @@ class _Renderer_ContainerAccessor extends RendererBase<ContainerAccessor> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3441,8 +3612,10 @@ class _Renderer_ContainerAccessor extends RendererBase<ContainerAccessor> {
                     var name = remainingNames.first;
                     var nextProperty = _Renderer_ContainerAccessor.propertyMap()
                         .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ContainerAccessor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.overriddenElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3452,14 +3625,14 @@ class _Renderer_ContainerAccessor extends RendererBase<ContainerAccessor> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ContainerAccessor(ContainerAccessor context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ContainerAccessor(ContainerAccessor? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ContainerAccessor> getProperty(String key) {
+  Property<ContainerAccessor?>? getProperty(String key) {
     if (propertyMap<ContainerAccessor>().containsKey(key)) {
       return propertyMap<ContainerAccessor>()[key];
     } else {
@@ -3468,7 +3641,7 @@ class _Renderer_ContainerAccessor extends RendererBase<ContainerAccessor> {
   }
 }
 
-class _Renderer_ContainerMember extends RendererBase<ContainerMember> {
+class _Renderer_ContainerMember extends RendererBase<ContainerMember?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends ContainerMember>() =>
@@ -3485,8 +3658,10 @@ class _Renderer_ContainerMember extends RendererBase<ContainerMember> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.canonicalEnclosingContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3506,8 +3681,10 @@ class _Renderer_ContainerMember extends RendererBase<ContainerMember> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.definingEnclosingContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3527,7 +3704,7 @@ class _Renderer_ContainerMember extends RendererBase<ContainerMember> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.features.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Feature']));
+                        parent: r, getters: _invisibleGetters['Feature']!));
                   },
                 ),
                 'isExtended': Property(
@@ -3561,14 +3738,14 @@ class _Renderer_ContainerMember extends RendererBase<ContainerMember> {
                         _render_Container(e, ast, r.template, sink, parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ContainerMember(ContainerMember context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ContainerMember(ContainerMember? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ContainerMember> getProperty(String key) {
+  Property<ContainerMember?>? getProperty(String key) {
     if (propertyMap<ContainerMember>().containsKey(key)) {
       return propertyMap<ContainerMember>()[key];
     } else {
@@ -3577,14 +3754,14 @@ class _Renderer_ContainerMember extends RendererBase<ContainerMember> {
   }
 }
 
-void _render_DefinedElementType(DefinedElementType context,
+void _render_DefinedElementType(DefinedElementType? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_DefinedElementType(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
+class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends DefinedElementType>() =>
@@ -3602,8 +3779,10 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_CommentReferable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as CommentReferable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.definingCommentReferable == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3611,7 +3790,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                     renderSimple(
                         c.definingCommentReferable, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']);
+                        getters: _invisibleGetters['CommentReferable']!);
                   },
                 ),
                 'element': Property(
@@ -3623,7 +3802,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Element']);
+                        parent: r, getters: _invisibleGetters['Element']!);
                   },
                 ),
                 'fullyQualifiedName': Property(
@@ -3636,8 +3815,10 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3655,7 +3836,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.instantiatedType, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['DartType']);
+                        parent: r, getters: _invisibleGetters['DartType']!);
                   },
                 ),
                 'isParameterType': Property(
@@ -3682,8 +3863,10 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3702,8 +3885,10 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3721,7 +3906,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceGrandparentOverrides': Property(
@@ -3736,7 +3921,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
                         c.referenceGrandparentOverrides, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -3750,7 +3935,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'typeArguments': Property(
@@ -3766,14 +3951,14 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_DefinedElementType(DefinedElementType context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_DefinedElementType(DefinedElementType? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<DefinedElementType> getProperty(String key) {
+  Property<DefinedElementType?>? getProperty(String key) {
     if (propertyMap<DefinedElementType>().containsKey(key)) {
       return propertyMap<DefinedElementType>()[key];
     } else {
@@ -3782,14 +3967,14 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType> {
   }
 }
 
-void _render_Documentable(Documentable context, List<MustachioNode> ast,
+void _render_Documentable(Documentable? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Documentable(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Documentable extends RendererBase<Documentable> {
+class _Renderer_Documentable extends RendererBase<Documentable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Documentable>() =>
       _propertyMapCache.putIfAbsent(
@@ -3807,7 +3992,7 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DartdocOptionContext']);
+                        getters: _invisibleGetters['DartdocOptionContext']!);
                   },
                 ),
                 'documentation': Property(
@@ -3820,8 +4005,10 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentation == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3840,8 +4027,10 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationAsHtml == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3874,8 +4063,10 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3900,8 +4091,10 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3919,8 +4112,10 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.oneLineDoc == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3939,17 +4134,17 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Documentable(Documentable context, RendererBase<Object> parent,
+  _Renderer_Documentable(Documentable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Documentable> getProperty(String key) {
+  Property<Documentable?>? getProperty(String key) {
     if (propertyMap<Documentable>().containsKey(key)) {
       return propertyMap<Documentable>()[key];
     } else {
@@ -3959,7 +4154,7 @@ class _Renderer_Documentable extends RendererBase<Documentable> {
 }
 
 class _Renderer_DocumentationComment
-    extends RendererBase<DocumentationComment> {
+    extends RendererBase<DocumentationComment?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends DocumentationComment>() =>
@@ -3976,8 +4171,10 @@ class _Renderer_DocumentationComment
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationAsHtml == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -3996,8 +4193,10 @@ class _Renderer_DocumentationComment
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationComment == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4018,7 +4217,7 @@ class _Renderer_DocumentationComment
                     return c.documentationFrom.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DocumentationComment']));
+                        getters: _invisibleGetters['DocumentationComment']!));
                   },
                 ),
                 'documentationLocal': Property(
@@ -4031,8 +4230,10 @@ class _Renderer_DocumentationComment
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationLocal == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4051,7 +4252,8 @@ class _Renderer_DocumentationComment
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.elementDocumentation, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Documentation']);
+                        parent: r,
+                        getters: _invisibleGetters['Documentation']!);
                   },
                 ),
                 'fullyQualifiedNameWithoutLibrary': Property(
@@ -4064,8 +4266,10 @@ class _Renderer_DocumentationComment
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) =>
                       c.fullyQualifiedNameWithoutLibrary == null,
@@ -4101,7 +4305,7 @@ class _Renderer_DocumentationComment
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelElementRenderer, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ModelElementRenderer']);
+                        getters: _invisibleGetters['ModelElementRenderer']!);
                   },
                 ),
                 'needsPrecache': Property(
@@ -4120,7 +4324,7 @@ class _Renderer_DocumentationComment
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.pathContext, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Context']);
+                        parent: r, getters: _invisibleGetters['Context']!);
                   },
                 ),
                 'sourceFileName': Property(
@@ -4133,8 +4337,10 @@ class _Renderer_DocumentationComment
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sourceFileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4143,14 +4349,14 @@ class _Renderer_DocumentationComment
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_DocumentationComment(DocumentationComment context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_DocumentationComment(DocumentationComment? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<DocumentationComment> getProperty(String key) {
+  Property<DocumentationComment?>? getProperty(String key) {
     if (propertyMap<DocumentationComment>().containsKey(key)) {
       return propertyMap<DocumentationComment>()[key];
     } else {
@@ -4159,14 +4365,14 @@ class _Renderer_DocumentationComment
   }
 }
 
-void _render_ElementType(ElementType context, List<MustachioNode> ast,
+void _render_ElementType(ElementType? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_ElementType(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_ElementType extends RendererBase<ElementType> {
+class _Renderer_ElementType extends RendererBase<ElementType?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends ElementType>() =>
       _propertyMapCache.putIfAbsent(
@@ -4192,7 +4398,7 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.instantiatedType, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['DartType']);
+                        parent: r, getters: _invisibleGetters['DartType']!);
                   },
                 ),
                 'isTypedef': Property(
@@ -4212,8 +4418,10 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4232,8 +4440,10 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4252,8 +4462,10 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nameWithGenerics == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4272,8 +4484,10 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nullabilitySuffix == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4292,7 +4506,7 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
                 'returnedFrom': Property(
@@ -4305,8 +4519,10 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.returnedFrom == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4324,7 +4540,7 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.type, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['DartType']);
+                        parent: r, getters: _invisibleGetters['DartType']!);
                   },
                 ),
                 'typeArguments': Property(
@@ -4340,14 +4556,14 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ElementType(ElementType context, RendererBase<Object> parent,
+  _Renderer_ElementType(ElementType? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ElementType> getProperty(String key) {
+  Property<ElementType?>? getProperty(String key) {
     if (propertyMap<ElementType>().containsKey(key)) {
       return propertyMap<ElementType>()[key];
     } else {
@@ -4357,13 +4573,13 @@ class _Renderer_ElementType extends RendererBase<ElementType> {
 }
 
 void _render_Enum(
-    Enum context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    Enum? context, List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Enum(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Enum extends RendererBase<Enum> {
+class _Renderer_Enum extends RendererBase<Enum?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Enum>() =>
       _propertyMapCache.putIfAbsent(
@@ -4394,8 +4610,10 @@ class _Renderer_Enum extends RendererBase<Enum> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4403,14 +4621,14 @@ class _Renderer_Enum extends RendererBase<Enum> {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Enum(Enum context, RendererBase<Object> parent, Template template,
+  _Renderer_Enum(Enum? context, RendererBase<Object>? parent, Template template,
       StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Enum> getProperty(String key) {
+  Property<Enum?>? getProperty(String key) {
     if (propertyMap<Enum>().containsKey(key)) {
       return propertyMap<Enum>()[key];
     } else {
@@ -4419,20 +4637,20 @@ class _Renderer_Enum extends RendererBase<Enum> {
   }
 }
 
-String renderEnum(EnumTemplateData context, Template template) {
+String renderEnum(EnumTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_EnumTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_EnumTemplateData(EnumTemplateData context, List<MustachioNode> ast,
-    Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+void _render_EnumTemplateData(EnumTemplateData? context,
+    List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_EnumTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData> {
+class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>>
       propertyMap<CT_ extends EnumTemplateData>() =>
@@ -4451,8 +4669,10 @@ class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData> {
                         var name = remainingNames.first;
                         var nextProperty =
                             _Renderer_Enum.propertyMap().getValue(name);
-                        return nextProperty.renderVariable(self.getValue(c),
-                            nextProperty, [...remainingNames.skip(1)]);
+                        return nextProperty.renderVariable(
+                            self.getValue(c) as Enum,
+                            nextProperty,
+                            [...remainingNames.skip(1)]);
                       },
                       isNullValue: (CT_ c) => c.eNum == null,
                       renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4470,8 +4690,10 @@ class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData> {
                         var name = remainingNames.first;
                         var nextProperty =
                             _Renderer_Enum.propertyMap().getValue(name);
-                        return nextProperty.renderVariable(self.getValue(c),
-                            nextProperty, [...remainingNames.skip(1)]);
+                        return nextProperty.renderVariable(
+                            self.getValue(c) as Enum,
+                            nextProperty,
+                            [...remainingNames.skip(1)]);
                       },
                       isNullValue: (CT_ c) => c.self == null,
                       renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4479,14 +4701,14 @@ class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData> {
                         _render_Enum(c.self, ast, r.template, sink, parent: r);
                       },
                     ),
-                  });
+                  }) as Map<String, Property<CT_>>;
 
-  _Renderer_EnumTemplateData(EnumTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_EnumTemplateData(EnumTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<EnumTemplateData> getProperty(String key) {
+  Property<EnumTemplateData?>? getProperty(String key) {
     if (propertyMap<EnumTemplateData>().containsKey(key)) {
       return propertyMap<EnumTemplateData>()[key];
     } else {
@@ -4495,14 +4717,14 @@ class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData> {
   }
 }
 
-void _render_Extension(Extension context, List<MustachioNode> ast,
+void _render_Extension(Extension? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Extension(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Extension extends RendererBase<Extension> {
+class _Renderer_Extension extends RendererBase<Extension?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Extension>() =>
       _propertyMapCache.putIfAbsent(
@@ -4519,7 +4741,7 @@ class _Renderer_Extension extends RendererBase<Extension> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.allModelElements, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'alwaysApplies': Property(
@@ -4539,7 +4761,7 @@ class _Renderer_Extension extends RendererBase<Extension> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.declaredFields, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'declaredMethods': Property(
@@ -4552,7 +4774,7 @@ class _Renderer_Extension extends RendererBase<Extension> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.declaredMethods, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'element': Property(
@@ -4566,7 +4788,7 @@ class _Renderer_Extension extends RendererBase<Extension> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ExtensionElement']);
+                        getters: _invisibleGetters['ExtensionElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -4579,8 +4801,10 @@ class _Renderer_Extension extends RendererBase<Extension> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4600,8 +4824,10 @@ class _Renderer_Extension extends RendererBase<Extension> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.extendedType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4620,8 +4846,10 @@ class _Renderer_Extension extends RendererBase<Extension> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4640,8 +4868,10 @@ class _Renderer_Extension extends RendererBase<Extension> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4659,8 +4889,10 @@ class _Renderer_Extension extends RendererBase<Extension> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4678,7 +4910,7 @@ class _Renderer_Extension extends RendererBase<Extension> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'typeParameters': Property(
@@ -4694,14 +4926,14 @@ class _Renderer_Extension extends RendererBase<Extension> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Extension(Extension context, RendererBase<Object> parent,
+  _Renderer_Extension(Extension? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Extension> getProperty(String key) {
+  Property<Extension?>? getProperty(String key) {
     if (propertyMap<Extension>().containsKey(key)) {
       return propertyMap<Extension>()[key];
     } else {
@@ -4710,7 +4942,7 @@ class _Renderer_Extension extends RendererBase<Extension> {
   }
 }
 
-class _Renderer_ExtensionTarget extends RendererBase<ExtensionTarget> {
+class _Renderer_ExtensionTarget extends RendererBase<ExtensionTarget?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends ExtensionTarget>() =>
@@ -4742,8 +4974,10 @@ class _Renderer_ExtensionTarget extends RendererBase<ExtensionTarget> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4764,7 +4998,7 @@ class _Renderer_ExtensionTarget extends RendererBase<ExtensionTarget> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.potentiallyApplicableExtensions, ast,
                         r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'potentiallyApplicableExtensionsSorted': Property(
@@ -4779,14 +5013,14 @@ class _Renderer_ExtensionTarget extends RendererBase<ExtensionTarget> {
                         _render_Extension(e, ast, r.template, sink, parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ExtensionTarget(ExtensionTarget context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ExtensionTarget(ExtensionTarget? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ExtensionTarget> getProperty(String key) {
+  Property<ExtensionTarget?>? getProperty(String key) {
     if (propertyMap<ExtensionTarget>().containsKey(key)) {
       return propertyMap<ExtensionTarget>()[key];
     } else {
@@ -4796,25 +5030,25 @@ class _Renderer_ExtensionTarget extends RendererBase<ExtensionTarget> {
 }
 
 String renderExtension<T extends Extension>(
-    ExtensionTemplateData<T> context, Template template) {
+    ExtensionTemplateData<T>? context, Template template) {
   var buffer = StringBuffer();
   _render_ExtensionTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
 void _render_ExtensionTemplateData<T extends Extension>(
-    ExtensionTemplateData<T> context,
+    ExtensionTemplateData<T>? context,
     List<MustachioNode> ast,
     Template template,
     StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_ExtensionTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_ExtensionTemplateData<T extends Extension>
-    extends RendererBase<ExtensionTemplateData<T>> {
+    extends RendererBase<ExtensionTemplateData<T>?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<T extends Extension,
           CT_ extends ExtensionTemplateData>() =>
@@ -4832,8 +5066,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.container == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4852,8 +5088,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Extension.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Extension,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.extension == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4872,8 +5110,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4892,8 +5132,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4912,8 +5154,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4932,8 +5176,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4965,8 +5211,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Extension.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Extension,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -4984,8 +5232,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5004,8 +5254,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5024,8 +5276,10 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5033,23 +5287,23 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ExtensionTemplateData(ExtensionTemplateData<T> context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ExtensionTemplateData(ExtensionTemplateData<T>? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ExtensionTemplateData<T>> getProperty(String key) {
-    if (propertyMap<T, ExtensionTemplateData>().containsKey(key)) {
-      return propertyMap<T, ExtensionTemplateData>()[key];
+  Property<ExtensionTemplateData<T>?>? getProperty(String key) {
+    if (propertyMap<T, ExtensionTemplateData<T>>().containsKey(key)) {
+      return propertyMap<T, ExtensionTemplateData<T>>()[key];
     } else {
       return null;
     }
   }
 }
 
-class _Renderer_Feature extends RendererBase<Feature> {
+class _Renderer_Feature extends RendererBase<Feature?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Feature>() =>
       _propertyMapCache.putIfAbsent(
@@ -5066,8 +5320,10 @@ class _Renderer_Feature extends RendererBase<Feature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.featurePrefix == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5093,8 +5349,10 @@ class _Renderer_Feature extends RendererBase<Feature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5113,8 +5371,10 @@ class _Renderer_Feature extends RendererBase<Feature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedNameWithParameters == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5134,8 +5394,10 @@ class _Renderer_Feature extends RendererBase<Feature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5152,17 +5414,17 @@ class _Renderer_Feature extends RendererBase<Feature> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.sortGroup, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Feature(Feature context, RendererBase<Object> parent,
+  _Renderer_Feature(Feature? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Feature> getProperty(String key) {
+  Property<Feature?>? getProperty(String key) {
     if (propertyMap<Feature>().containsKey(key)) {
       return propertyMap<Feature>()[key];
     } else {
@@ -5171,7 +5433,7 @@ class _Renderer_Feature extends RendererBase<Feature> {
   }
 }
 
-class _Renderer_FeatureSet extends RendererBase<FeatureSet> {
+class _Renderer_FeatureSet extends RendererBase<FeatureSet?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends FeatureSet>() =>
       _propertyMapCache.putIfAbsent(
@@ -5214,8 +5476,10 @@ class _Renderer_FeatureSet extends RendererBase<FeatureSet> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5234,17 +5498,17 @@ class _Renderer_FeatureSet extends RendererBase<FeatureSet> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_FeatureSet(FeatureSet context, RendererBase<Object> parent,
+  _Renderer_FeatureSet(FeatureSet? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<FeatureSet> getProperty(String key) {
+  Property<FeatureSet?>? getProperty(String key) {
     if (propertyMap<FeatureSet>().containsKey(key)) {
       return propertyMap<FeatureSet>()[key];
     } else {
@@ -5254,13 +5518,13 @@ class _Renderer_FeatureSet extends RendererBase<FeatureSet> {
 }
 
 void _render_Field(
-    Field context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    Field? context, List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Field(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Field extends RendererBase<Field> {
+class _Renderer_Field extends RendererBase<Field?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Field>() =>
       _propertyMapCache.putIfAbsent(
@@ -5280,8 +5544,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentation == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5300,8 +5566,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5320,7 +5588,7 @@ class _Renderer_Field extends RendererBase<Field> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.features.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Feature']));
+                        parent: r, getters: _invisibleGetters['Feature']!));
                   },
                 ),
                 'field': Property(
@@ -5333,7 +5601,7 @@ class _Renderer_Field extends RendererBase<Field> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.field, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['FieldElement']);
+                        parent: r, getters: _invisibleGetters['FieldElement']!);
                   },
                 ),
                 'fileName': Property(
@@ -5346,8 +5614,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5366,8 +5636,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5386,8 +5658,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullkind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5406,8 +5680,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty = _Renderer_ContainerAccessor.propertyMap()
                         .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ContainerAccessor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.getter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5426,8 +5702,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5480,8 +5758,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5499,8 +5779,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5519,14 +5801,16 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Inheritable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Inheritable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.overriddenElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.overriddenElement, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Inheritable']);
+                        parent: r, getters: _invisibleGetters['Inheritable']!);
                   },
                 ),
                 'package': Property(
@@ -5539,8 +5823,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5559,8 +5845,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty = _Renderer_ContainerAccessor.propertyMap()
                         .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ContainerAccessor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.setter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5579,8 +5867,10 @@ class _Renderer_Field extends RendererBase<Field> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sourceCode == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5589,14 +5879,14 @@ class _Renderer_Field extends RendererBase<Field> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Field(Field context, RendererBase<Object> parent, Template template,
-      StringSink sink)
+  _Renderer_Field(Field? context, RendererBase<Object>? parent,
+      Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Field> getProperty(String key) {
+  Property<Field?>? getProperty(String key) {
     if (propertyMap<Field>().containsKey(key)) {
       return propertyMap<Field>()[key];
     } else {
@@ -5605,22 +5895,22 @@ class _Renderer_Field extends RendererBase<Field> {
   }
 }
 
-String renderFunction(FunctionTemplateData context, Template template) {
+String renderFunction(FunctionTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_FunctionTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_FunctionTemplateData(FunctionTemplateData context,
+void _render_FunctionTemplateData(FunctionTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_FunctionTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_FunctionTemplateData
-    extends RendererBase<FunctionTemplateData> {
+    extends RendererBase<FunctionTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends FunctionTemplateData>() =>
@@ -5638,8 +5928,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelFunction.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelFunction,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.function == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5658,8 +5950,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5678,8 +5972,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5698,8 +5994,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5718,8 +6016,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5751,8 +6051,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelFunction.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelFunction,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5771,8 +6073,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5791,8 +6095,10 @@ class _Renderer_FunctionTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5800,14 +6106,14 @@ class _Renderer_FunctionTemplateData
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_FunctionTemplateData(FunctionTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_FunctionTemplateData(FunctionTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<FunctionTemplateData> getProperty(String key) {
+  Property<FunctionTemplateData?>? getProperty(String key) {
     if (propertyMap<FunctionTemplateData>().containsKey(key)) {
       return propertyMap<FunctionTemplateData>()[key];
     } else {
@@ -5816,14 +6122,14 @@ class _Renderer_FunctionTemplateData
   }
 }
 
-void _render_FunctionTypedef(FunctionTypedef context, List<MustachioNode> ast,
+void _render_FunctionTypedef(FunctionTypedef? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_FunctionTypedef(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_FunctionTypedef extends RendererBase<FunctionTypedef> {
+class _Renderer_FunctionTypedef extends RendererBase<FunctionTypedef?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends FunctionTypedef>() =>
@@ -5841,8 +6147,10 @@ class _Renderer_FunctionTypedef extends RendererBase<FunctionTypedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Callable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Callable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5861,17 +6169,17 @@ class _Renderer_FunctionTypedef extends RendererBase<FunctionTypedef> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_FunctionTypedef(FunctionTypedef context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_FunctionTypedef(FunctionTypedef? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<FunctionTypedef> getProperty(String key) {
+  Property<FunctionTypedef?>? getProperty(String key) {
     if (propertyMap<FunctionTypedef>().containsKey(key)) {
       return propertyMap<FunctionTypedef>()[key];
     } else {
@@ -5880,7 +6188,7 @@ class _Renderer_FunctionTypedef extends RendererBase<FunctionTypedef> {
   }
 }
 
-class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
+class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends GetterSetterCombo>() =>
@@ -5922,8 +6230,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.arrow == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5942,7 +6252,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'constantInitializer': Property(
@@ -5955,7 +6265,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.constantInitializer, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Expression']);
+                        parent: r, getters: _invisibleGetters['Expression']!);
                   },
                 ),
                 'constantValue': Property(
@@ -5968,8 +6278,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.constantValue == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -5988,8 +6300,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.constantValueBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6008,8 +6322,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.constantValueTruncated == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6029,8 +6345,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationComment == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6051,7 +6369,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     return c.documentationFrom.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DocumentationComment']));
+                        getters: _invisibleGetters['DocumentationComment']!));
                   },
                 ),
                 'enclosingElement': Property(
@@ -6064,8 +6382,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6085,8 +6405,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Accessor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Accessor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.getter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6217,8 +6539,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedParamsNoMetadata == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6238,8 +6562,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6258,8 +6584,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.oneLineDoc == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6304,7 +6632,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'setter': Property(
@@ -6317,8 +6645,10 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Accessor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Accessor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.setter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6334,14 +6664,14 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
                       self.renderSimpleVariable(c, remainingNames, 'bool'),
                   getBool: (CT_ c) => c.writeOnly == true,
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_GetterSetterCombo(GetterSetterCombo context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_GetterSetterCombo(GetterSetterCombo? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<GetterSetterCombo> getProperty(String key) {
+  Property<GetterSetterCombo?>? getProperty(String key) {
     if (propertyMap<GetterSetterCombo>().containsKey(key)) {
       return propertyMap<GetterSetterCombo>()[key];
     } else {
@@ -6350,7 +6680,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo> {
   }
 }
 
-class _Renderer_Indexable extends RendererBase<Indexable> {
+class _Renderer_Indexable extends RendererBase<Indexable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Indexable>() =>
       _propertyMapCache.putIfAbsent(
@@ -6367,8 +6697,10 @@ class _Renderer_Indexable extends RendererBase<Indexable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6386,8 +6718,10 @@ class _Renderer_Indexable extends RendererBase<Indexable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6404,17 +6738,17 @@ class _Renderer_Indexable extends RendererBase<Indexable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.overriddenDepth, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Indexable(Indexable context, RendererBase<Object> parent,
+  _Renderer_Indexable(Indexable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Indexable> getProperty(String key) {
+  Property<Indexable?>? getProperty(String key) {
     if (propertyMap<Indexable>().containsKey(key)) {
       return propertyMap<Indexable>()[key];
     } else {
@@ -6423,7 +6757,7 @@ class _Renderer_Indexable extends RendererBase<Indexable> {
   }
 }
 
-class _Renderer_Inheritable extends RendererBase<Inheritable> {
+class _Renderer_Inheritable extends RendererBase<Inheritable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Inheritable>() =>
       _propertyMapCache.putIfAbsent(
@@ -6439,8 +6773,10 @@ class _Renderer_Inheritable extends RendererBase<Inheritable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.canonicalLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6459,7 +6795,7 @@ class _Renderer_Inheritable extends RendererBase<Inheritable> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.features.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Feature']));
+                        parent: r, getters: _invisibleGetters['Feature']!));
                   },
                 ),
                 'inheritance': Property(
@@ -6505,7 +6841,7 @@ class _Renderer_Inheritable extends RendererBase<Inheritable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.overriddenDepth, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'overriddenElement': Property(
@@ -6518,24 +6854,26 @@ class _Renderer_Inheritable extends RendererBase<Inheritable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Inheritable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Inheritable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.overriddenElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.overriddenElement, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Inheritable']);
+                        parent: r, getters: _invisibleGetters['Inheritable']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Inheritable(Inheritable context, RendererBase<Object> parent,
+  _Renderer_Inheritable(Inheritable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Inheritable> getProperty(String key) {
+  Property<Inheritable?>? getProperty(String key) {
     if (propertyMap<Inheritable>().containsKey(key)) {
       return propertyMap<Inheritable>()[key];
     } else {
@@ -6544,14 +6882,14 @@ class _Renderer_Inheritable extends RendererBase<Inheritable> {
   }
 }
 
-void _render_InheritingContainer(InheritingContainer context,
+void _render_InheritingContainer(InheritingContainer? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_InheritingContainer(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
+class _Renderer_InheritingContainer extends RendererBase<InheritingContainer?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends InheritingContainer>() =>
@@ -6570,7 +6908,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.allFields, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'allModelElements': Property(
@@ -6583,7 +6921,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.allModelElements, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'constantFields': Property(
@@ -6633,8 +6971,10 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                     var nextProperty =
                         _Renderer_InheritingContainer.propertyMap()
                             .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as InheritingContainer,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.definingContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6654,7 +6994,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['ClassElement']);
+                        parent: r, getters: _invisibleGetters['ClassElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -6667,8 +7007,10 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6688,8 +7030,10 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6708,8 +7052,10 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullkind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6774,7 +7120,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.inheritedMethods, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'inheritedOperators': Property(
@@ -6787,7 +7133,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.inheritedOperators, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'instanceFields': Property(
@@ -6844,8 +7190,10 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                     var nextProperty =
                         _Renderer_DefinedElementType.propertyMap()
                             .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as DefinedElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6964,8 +7312,10 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                     var nextProperty =
                         _Renderer_DefinedElementType.propertyMap()
                             .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as DefinedElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.supertype == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -6988,14 +7338,14 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_InheritingContainer(InheritingContainer context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_InheritingContainer(InheritingContainer? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<InheritingContainer> getProperty(String key) {
+  Property<InheritingContainer?>? getProperty(String key) {
     if (propertyMap<InheritingContainer>().containsKey(key)) {
       return propertyMap<InheritingContainer>()[key];
     } else {
@@ -7005,7 +7355,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer> {
 }
 
 class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
-    extends RendererBase<InheritingContainerTemplateData<T>> {
+    extends RendererBase<InheritingContainerTemplateData<T>?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<T extends InheritingContainer,
           CT_ extends InheritingContainerTemplateData>() =>
@@ -7024,8 +7374,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var nextProperty =
                         _Renderer_InheritingContainer.propertyMap()
                             .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as InheritingContainer,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.clazz == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7044,8 +7396,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.container == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7064,8 +7418,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7084,8 +7440,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7104,8 +7462,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7124,8 +7484,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedObjectType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7144,8 +7506,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7177,8 +7541,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Class.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Class,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.objectType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7198,8 +7564,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var nextProperty =
                         _Renderer_InheritingContainer.propertyMap()
                             .getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as InheritingContainer,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7218,8 +7586,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7238,8 +7608,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7258,8 +7630,10 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7267,33 +7641,33 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
   _Renderer_InheritingContainerTemplateData(
-      InheritingContainerTemplateData<T> context,
-      RendererBase<Object> parent,
+      InheritingContainerTemplateData<T>? context,
+      RendererBase<Object>? parent,
       Template template,
       StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<InheritingContainerTemplateData<T>> getProperty(String key) {
-    if (propertyMap<T, InheritingContainerTemplateData>().containsKey(key)) {
-      return propertyMap<T, InheritingContainerTemplateData>()[key];
+  Property<InheritingContainerTemplateData<T>?>? getProperty(String key) {
+    if (propertyMap<T, InheritingContainerTemplateData<T>>().containsKey(key)) {
+      return propertyMap<T, InheritingContainerTemplateData<T>>()[key];
     } else {
       return null;
     }
   }
 }
 
-void _render_LanguageFeature(LanguageFeature context, List<MustachioNode> ast,
+void _render_LanguageFeature(LanguageFeature? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_LanguageFeature(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_LanguageFeature extends RendererBase<LanguageFeature> {
+class _Renderer_LanguageFeature extends RendererBase<LanguageFeature?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends LanguageFeature>() =>
@@ -7311,8 +7685,10 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.featureDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7331,8 +7707,10 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.featureLabel == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7351,8 +7729,10 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.featureUrl == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7371,8 +7751,10 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7380,14 +7762,14 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature> {
                     _render_String(c.name, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_LanguageFeature(LanguageFeature context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_LanguageFeature(LanguageFeature? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<LanguageFeature> getProperty(String key) {
+  Property<LanguageFeature?>? getProperty(String key) {
     if (propertyMap<LanguageFeature>().containsKey(key)) {
       return propertyMap<LanguageFeature>()[key];
     } else {
@@ -7396,14 +7778,14 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature> {
   }
 }
 
-void _render_Library(Library context, List<MustachioNode> ast,
+void _render_Library(Library? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Library(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Library extends RendererBase<Library> {
+class _Renderer_Library extends RendererBase<Library?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Library>() =>
       _propertyMapCache.putIfAbsent(
@@ -7473,7 +7855,7 @@ class _Renderer_Library extends RendererBase<Library> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'classes': Property(
@@ -7500,7 +7882,7 @@ class _Renderer_Library extends RendererBase<Library> {
                     renderSimple(
                         c.compilationUnitElement, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CompilationUnitElement']);
+                        getters: _invisibleGetters['CompilationUnitElement']!);
                   },
                 ),
                 'constants': Property(
@@ -7526,8 +7908,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.dirName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7546,7 +7930,7 @@ class _Renderer_Library extends RendererBase<Library> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['LibraryElement']);
+                        getters: _invisibleGetters['LibraryElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -7559,8 +7943,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7616,8 +8002,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7636,8 +8024,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7669,8 +8059,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7689,7 +8081,7 @@ class _Renderer_Library extends RendererBase<Library> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.inheritanceManager, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['InheritanceManager3']);
+                        getters: _invisibleGetters['InheritanceManager3']!);
                   },
                 ),
                 'isAnonymous': Property(
@@ -7730,8 +8122,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7749,8 +8143,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7781,7 +8177,7 @@ class _Renderer_Library extends RendererBase<Library> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelElementsMap, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['HashMap']);
+                        parent: r, getters: _invisibleGetters['HashMap']!);
                   },
                 ),
                 'name': Property(
@@ -7794,8 +8190,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7813,8 +8211,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nameFromPath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7833,8 +8233,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7853,7 +8255,7 @@ class _Renderer_Library extends RendererBase<Library> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageMeta, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageMeta']);
+                        parent: r, getters: _invisibleGetters['PackageMeta']!);
                   },
                 ),
                 'packageName': Property(
@@ -7866,8 +8268,10 @@ class _Renderer_Library extends RendererBase<Library> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.packageName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -7886,7 +8290,7 @@ class _Renderer_Library extends RendererBase<Library> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.prefixToLibrary, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'properties': Property(
@@ -7912,7 +8316,7 @@ class _Renderer_Library extends RendererBase<Library> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -7926,7 +8330,7 @@ class _Renderer_Library extends RendererBase<Library> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'scope': Property(
@@ -7938,7 +8342,7 @@ class _Renderer_Library extends RendererBase<Library> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.scope, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Scope']);
+                        parent: r, getters: _invisibleGetters['Scope']!);
                   },
                 ),
                 'sdkLib': Property(
@@ -7951,7 +8355,7 @@ class _Renderer_Library extends RendererBase<Library> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.sdkLib, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['SdkLibrary']);
+                        parent: r, getters: _invisibleGetters['SdkLibrary']!);
                   },
                 ),
                 'typeSystem': Property(
@@ -7964,7 +8368,7 @@ class _Renderer_Library extends RendererBase<Library> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.typeSystem, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['TypeSystem']);
+                        parent: r, getters: _invisibleGetters['TypeSystem']!);
                   },
                 ),
                 'typedefs': Property(
@@ -7979,14 +8383,14 @@ class _Renderer_Library extends RendererBase<Library> {
                         _render_Typedef(e, ast, r.template, sink, parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Library(Library context, RendererBase<Object> parent,
+  _Renderer_Library(Library? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Library> getProperty(String key) {
+  Property<Library?>? getProperty(String key) {
     if (propertyMap<Library>().containsKey(key)) {
       return propertyMap<Library>()[key];
     } else {
@@ -7995,14 +8399,14 @@ class _Renderer_Library extends RendererBase<Library> {
   }
 }
 
-void _render_LibraryContainer(LibraryContainer context, List<MustachioNode> ast,
-    Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+void _render_LibraryContainer(LibraryContainer? context,
+    List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_LibraryContainer(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_LibraryContainer extends RendererBase<LibraryContainer> {
+class _Renderer_LibraryContainer extends RendererBase<LibraryContainer?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends LibraryContainer>() =>
@@ -8032,8 +8436,10 @@ class _Renderer_LibraryContainer extends RendererBase<LibraryContainer> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8078,7 +8484,7 @@ class _Renderer_LibraryContainer extends RendererBase<LibraryContainer> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
                 'publicLibraries': Property(
@@ -8115,8 +8521,10 @@ class _Renderer_LibraryContainer extends RendererBase<LibraryContainer> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sortKey == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8124,14 +8532,14 @@ class _Renderer_LibraryContainer extends RendererBase<LibraryContainer> {
                     _render_String(c.sortKey, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_LibraryContainer(LibraryContainer context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_LibraryContainer(LibraryContainer? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<LibraryContainer> getProperty(String key) {
+  Property<LibraryContainer?>? getProperty(String key) {
     if (propertyMap<LibraryContainer>().containsKey(key)) {
       return propertyMap<LibraryContainer>()[key];
     } else {
@@ -8140,20 +8548,20 @@ class _Renderer_LibraryContainer extends RendererBase<LibraryContainer> {
   }
 }
 
-String renderLibrary(LibraryTemplateData context, Template template) {
+String renderLibrary(LibraryTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_LibraryTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_LibraryTemplateData(LibraryTemplateData context,
+void _render_LibraryTemplateData(LibraryTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_LibraryTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
+class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends LibraryTemplateData>() =>
@@ -8171,8 +8579,10 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8191,8 +8601,10 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8211,8 +8623,10 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8231,8 +8645,10 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8264,8 +8680,10 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8283,8 +8701,10 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8303,8 +8723,10 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8312,14 +8734,14 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_LibraryTemplateData(LibraryTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_LibraryTemplateData(LibraryTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<LibraryTemplateData> getProperty(String key) {
+  Property<LibraryTemplateData?>? getProperty(String key) {
     if (propertyMap<LibraryTemplateData>().containsKey(key)) {
       return propertyMap<LibraryTemplateData>()[key];
     } else {
@@ -8328,7 +8750,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData> {
   }
 }
 
-class _Renderer_Locatable extends RendererBase<Locatable> {
+class _Renderer_Locatable extends RendererBase<Locatable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Locatable>() =>
       _propertyMapCache.putIfAbsent(
@@ -8345,7 +8767,7 @@ class _Renderer_Locatable extends RendererBase<Locatable> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.documentationFrom.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Locatable']));
+                        parent: r, getters: _invisibleGetters['Locatable']!));
                   },
                 ),
                 'documentationIsLocal': Property(
@@ -8365,8 +8787,10 @@ class _Renderer_Locatable extends RendererBase<Locatable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8385,8 +8809,10 @@ class _Renderer_Locatable extends RendererBase<Locatable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8404,8 +8830,10 @@ class _Renderer_Locatable extends RendererBase<Locatable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.location == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8414,14 +8842,14 @@ class _Renderer_Locatable extends RendererBase<Locatable> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Locatable(Locatable context, RendererBase<Object> parent,
+  _Renderer_Locatable(Locatable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Locatable> getProperty(String key) {
+  Property<Locatable?>? getProperty(String key) {
     if (propertyMap<Locatable>().containsKey(key)) {
       return propertyMap<Locatable>()[key];
     } else {
@@ -8431,7 +8859,7 @@ class _Renderer_Locatable extends RendererBase<Locatable> {
 }
 
 class _Renderer_MarkdownFileDocumentation
-    extends RendererBase<MarkdownFileDocumentation> {
+    extends RendererBase<MarkdownFileDocumentation?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends MarkdownFileDocumentation>() =>
@@ -8448,8 +8876,10 @@ class _Renderer_MarkdownFileDocumentation
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentation == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8468,8 +8898,10 @@ class _Renderer_MarkdownFileDocumentation
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationAsHtml == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8487,7 +8919,7 @@ class _Renderer_MarkdownFileDocumentation
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentationFile, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['File']);
+                        parent: r, getters: _invisibleGetters['File']!);
                   },
                 ),
                 'documentedWhere': Property(
@@ -8501,7 +8933,7 @@ class _Renderer_MarkdownFileDocumentation
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentedWhere, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DocumentLocation']);
+                        getters: _invisibleGetters['DocumentLocation']!);
                   },
                 ),
                 'hasDocumentation': Property(
@@ -8535,8 +8967,10 @@ class _Renderer_MarkdownFileDocumentation
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.location == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8567,8 +9001,10 @@ class _Renderer_MarkdownFileDocumentation
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.oneLineDoc == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8577,14 +9013,14 @@ class _Renderer_MarkdownFileDocumentation
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_MarkdownFileDocumentation(MarkdownFileDocumentation context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_MarkdownFileDocumentation(MarkdownFileDocumentation? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<MarkdownFileDocumentation> getProperty(String key) {
+  Property<MarkdownFileDocumentation?>? getProperty(String key) {
     if (propertyMap<MarkdownFileDocumentation>().containsKey(key)) {
       return propertyMap<MarkdownFileDocumentation>()[key];
     } else {
@@ -8593,14 +9029,14 @@ class _Renderer_MarkdownFileDocumentation
   }
 }
 
-void _render_Method(
-    Method context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+void _render_Method(Method? context, List<MustachioNode> ast, Template template,
+    StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Method(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Method extends RendererBase<Method> {
+class _Renderer_Method extends RendererBase<Method?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Method>() =>
       _propertyMapCache.putIfAbsent(
@@ -8621,7 +9057,7 @@ class _Renderer_Method extends RendererBase<Method> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'element': Property(
@@ -8634,7 +9070,8 @@ class _Renderer_Method extends RendererBase<Method> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['MethodElement']);
+                        parent: r,
+                        getters: _invisibleGetters['MethodElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -8647,8 +9084,10 @@ class _Renderer_Method extends RendererBase<Method> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8668,7 +9107,7 @@ class _Renderer_Method extends RendererBase<Method> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.features.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Feature']));
+                        parent: r, getters: _invisibleGetters['Feature']!));
                   },
                 ),
                 'filePath': Property(
@@ -8681,8 +9120,10 @@ class _Renderer_Method extends RendererBase<Method> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8701,8 +9142,10 @@ class _Renderer_Method extends RendererBase<Method> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullkind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8721,8 +9164,10 @@ class _Renderer_Method extends RendererBase<Method> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8768,8 +9213,10 @@ class _Renderer_Method extends RendererBase<Method> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8787,8 +9234,10 @@ class _Renderer_Method extends RendererBase<Method> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Callable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Callable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8808,7 +9257,7 @@ class _Renderer_Method extends RendererBase<Method> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.originalMember, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ExecutableMember']);
+                        getters: _invisibleGetters['ExecutableMember']!);
                   },
                 ),
                 'overriddenElement': Property(
@@ -8821,8 +9270,10 @@ class _Renderer_Method extends RendererBase<Method> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Method.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Method,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.overriddenElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8841,7 +9292,7 @@ class _Renderer_Method extends RendererBase<Method> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'typeParameters': Property(
@@ -8857,14 +9308,14 @@ class _Renderer_Method extends RendererBase<Method> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Method(Method context, RendererBase<Object> parent,
+  _Renderer_Method(Method? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Method> getProperty(String key) {
+  Property<Method?>? getProperty(String key) {
     if (propertyMap<Method>().containsKey(key)) {
       return propertyMap<Method>()[key];
     } else {
@@ -8873,20 +9324,20 @@ class _Renderer_Method extends RendererBase<Method> {
   }
 }
 
-String renderMethod(MethodTemplateData context, Template template) {
+String renderMethod(MethodTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_MethodTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_MethodTemplateData(MethodTemplateData context,
+void _render_MethodTemplateData(MethodTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_MethodTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
+class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends MethodTemplateData>() =>
@@ -8904,8 +9355,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.container == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8924,8 +9377,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8944,8 +9399,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8964,8 +9421,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -8984,8 +9443,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9004,8 +9465,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Method.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Method,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.method == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9048,8 +9511,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Method.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Method,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9067,8 +9532,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9087,8 +9554,10 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9096,14 +9565,14 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_MethodTemplateData(MethodTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_MethodTemplateData(MethodTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<MethodTemplateData> getProperty(String key) {
+  Property<MethodTemplateData?>? getProperty(String key) {
     if (propertyMap<MethodTemplateData>().containsKey(key)) {
       return propertyMap<MethodTemplateData>()[key];
     } else {
@@ -9112,7 +9581,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData> {
   }
 }
 
-class _Renderer_MixedInTypes extends RendererBase<MixedInTypes> {
+class _Renderer_MixedInTypes extends RendererBase<MixedInTypes?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends MixedInTypes>() =>
       _propertyMapCache.putIfAbsent(
@@ -9158,14 +9627,14 @@ class _Renderer_MixedInTypes extends RendererBase<MixedInTypes> {
                             parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_MixedInTypes(MixedInTypes context, RendererBase<Object> parent,
+  _Renderer_MixedInTypes(MixedInTypes? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<MixedInTypes> getProperty(String key) {
+  Property<MixedInTypes?>? getProperty(String key) {
     if (propertyMap<MixedInTypes>().containsKey(key)) {
       return propertyMap<MixedInTypes>()[key];
     } else {
@@ -9175,13 +9644,13 @@ class _Renderer_MixedInTypes extends RendererBase<MixedInTypes> {
 }
 
 void _render_Mixin(
-    Mixin context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    Mixin? context, List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Mixin(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Mixin extends RendererBase<Mixin> {
+class _Renderer_Mixin extends RendererBase<Mixin?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Mixin>() =>
       _propertyMapCache.putIfAbsent(
@@ -9199,8 +9668,10 @@ class _Renderer_Mixin extends RendererBase<Mixin> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9246,8 +9717,10 @@ class _Renderer_Mixin extends RendererBase<Mixin> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9279,17 +9752,17 @@ class _Renderer_Mixin extends RendererBase<Mixin> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.superclassConstraints, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Mixin(Mixin context, RendererBase<Object> parent, Template template,
-      StringSink sink)
+  _Renderer_Mixin(Mixin? context, RendererBase<Object>? parent,
+      Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Mixin> getProperty(String key) {
+  Property<Mixin?>? getProperty(String key) {
     if (propertyMap<Mixin>().containsKey(key)) {
       return propertyMap<Mixin>()[key];
     } else {
@@ -9298,20 +9771,20 @@ class _Renderer_Mixin extends RendererBase<Mixin> {
   }
 }
 
-String renderMixin(MixinTemplateData context, Template template) {
+String renderMixin(MixinTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_MixinTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_MixinTemplateData(MixinTemplateData context,
+void _render_MixinTemplateData(MixinTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_MixinTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData> {
+class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends MixinTemplateData>() =>
@@ -9330,8 +9803,10 @@ class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Mixin.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Mixin,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.mixin == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9349,8 +9824,10 @@ class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Mixin.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Mixin,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9358,14 +9835,14 @@ class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData> {
                     _render_Mixin(c.self, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_MixinTemplateData(MixinTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_MixinTemplateData(MixinTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<MixinTemplateData> getProperty(String key) {
+  Property<MixinTemplateData?>? getProperty(String key) {
     if (propertyMap<MixinTemplateData>().containsKey(key)) {
       return propertyMap<MixinTemplateData>()[key];
     } else {
@@ -9374,7 +9851,7 @@ class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData> {
   }
 }
 
-class _Renderer_ModelBuilder extends RendererBase<ModelBuilder> {
+class _Renderer_ModelBuilder extends RendererBase<ModelBuilder?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends ModelBuilder>() =>
       _propertyMapCache.putIfAbsent(
@@ -9391,7 +9868,7 @@ class _Renderer_ModelBuilder extends RendererBase<ModelBuilder> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelBuilder, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ModelObjectBuilder']);
+                        getters: _invisibleGetters['ModelObjectBuilder']!);
                   },
                 ),
                 'packageGraph': Property(
@@ -9404,17 +9881,17 @@ class _Renderer_ModelBuilder extends RendererBase<ModelBuilder> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ModelBuilder(ModelBuilder context, RendererBase<Object> parent,
+  _Renderer_ModelBuilder(ModelBuilder? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ModelBuilder> getProperty(String key) {
+  Property<ModelBuilder?>? getProperty(String key) {
     if (propertyMap<ModelBuilder>().containsKey(key)) {
       return propertyMap<ModelBuilder>()[key];
     } else {
@@ -9423,14 +9900,14 @@ class _Renderer_ModelBuilder extends RendererBase<ModelBuilder> {
   }
 }
 
-void _render_ModelElement(ModelElement context, List<MustachioNode> ast,
+void _render_ModelElement(ModelElement? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_ModelElement(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_ModelElement extends RendererBase<ModelElement> {
+class _Renderer_ModelElement extends RendererBase<ModelElement?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends ModelElement>() =>
       _propertyMapCache.putIfAbsent(
@@ -9457,7 +9934,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.allParameters, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['List']);
+                        parent: r, getters: _invisibleGetters['List']!);
                   },
                 ),
                 'annotations': Property(
@@ -9483,8 +9960,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.canonicalLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9503,8 +9982,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.canonicalModelElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9525,7 +10006,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'commentRefs': Property(
@@ -9538,7 +10019,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'compilationUnitElement': Property(
@@ -9553,7 +10034,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     renderSimple(
                         c.compilationUnitElement, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CompilationUnitElement']);
+                        getters: _invisibleGetters['CompilationUnitElement']!);
                   },
                 ),
                 'config': Property(
@@ -9567,7 +10048,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DartdocOptionContext']);
+                        getters: _invisibleGetters['DartdocOptionContext']!);
                   },
                 ),
                 'definingCommentReferable': Property(
@@ -9580,8 +10061,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_CommentReferable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as CommentReferable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.definingCommentReferable == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9589,7 +10072,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     renderSimple(
                         c.definingCommentReferable, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']);
+                        getters: _invisibleGetters['CommentReferable']!);
                   },
                 ),
                 'definingLibrary': Property(
@@ -9602,8 +10085,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.definingLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9634,8 +10119,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentation == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9654,8 +10141,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationComment == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9674,7 +10163,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Element']);
+                        parent: r, getters: _invisibleGetters['Element']!);
                   },
                 ),
                 'exportedInLibraries': Property(
@@ -9687,7 +10176,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.exportedInLibraries, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Set']);
+                        parent: r, getters: _invisibleGetters['Set']!);
                   },
                 ),
                 'extendedDocLink': Property(
@@ -9700,8 +10189,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.extendedDocLink == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9720,7 +10211,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.features.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Feature']));
+                        parent: r, getters: _invisibleGetters['Feature']!));
                   },
                 ),
                 'featuresAsString': Property(
@@ -9733,8 +10224,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.featuresAsString == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9753,8 +10246,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9773,8 +10268,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9793,8 +10290,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9813,8 +10312,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9833,8 +10334,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) =>
                       c.fullyQualifiedNameWithoutLibrary == null,
@@ -9911,8 +10414,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -9930,8 +10435,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlId == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10054,8 +10561,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10073,8 +10582,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10093,8 +10604,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10113,8 +10626,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedParams == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10133,8 +10648,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedParamsLines == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10153,8 +10670,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedParamsNoMetadata == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10174,8 +10693,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) =>
                       c.linkedParamsNoMetadataOrNames == null,
@@ -10196,8 +10717,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.location == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10227,7 +10750,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelNode, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['ModelNode']);
+                        parent: r, getters: _invisibleGetters['ModelNode']!);
                   },
                 ),
                 'name': Property(
@@ -10240,8 +10763,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10259,8 +10784,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.oneLineDoc == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10278,7 +10805,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.originalMember, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Member']);
+                        parent: r, getters: _invisibleGetters['Member']!);
                   },
                 ),
                 'package': Property(
@@ -10291,8 +10818,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10311,7 +10840,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
                 'parameters': Property(
@@ -10335,7 +10864,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.pathContext, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Context']);
+                        parent: r, getters: _invisibleGetters['Context']!);
                   },
                 ),
                 'sourceCode': Property(
@@ -10348,8 +10877,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sourceCode == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10368,8 +10899,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sourceFileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10388,8 +10921,10 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sourceHref == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10398,14 +10933,14 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ModelElement(ModelElement context, RendererBase<Object> parent,
+  _Renderer_ModelElement(ModelElement? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ModelElement> getProperty(String key) {
+  Property<ModelElement?>? getProperty(String key) {
     if (propertyMap<ModelElement>().containsKey(key)) {
       return propertyMap<ModelElement>()[key];
     } else {
@@ -10414,14 +10949,14 @@ class _Renderer_ModelElement extends RendererBase<ModelElement> {
   }
 }
 
-void _render_ModelFunction(ModelFunction context, List<MustachioNode> ast,
+void _render_ModelFunction(ModelFunction? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_ModelFunction(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_ModelFunction extends RendererBase<ModelFunction> {
+class _Renderer_ModelFunction extends RendererBase<ModelFunction?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends ModelFunction>() =>
       _propertyMapCache.putIfAbsent(
@@ -10440,7 +10975,7 @@ class _Renderer_ModelFunction extends RendererBase<ModelFunction> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['FunctionElement']);
+                        getters: _invisibleGetters['FunctionElement']!);
                   },
                 ),
                 'isStatic': Property(
@@ -10460,8 +10995,10 @@ class _Renderer_ModelFunction extends RendererBase<ModelFunction> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10469,14 +11006,14 @@ class _Renderer_ModelFunction extends RendererBase<ModelFunction> {
                     _render_String(c.name, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ModelFunction(ModelFunction context, RendererBase<Object> parent,
+  _Renderer_ModelFunction(ModelFunction? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ModelFunction> getProperty(String key) {
+  Property<ModelFunction?>? getProperty(String key) {
     if (propertyMap<ModelFunction>().containsKey(key)) {
       return propertyMap<ModelFunction>()[key];
     } else {
@@ -10485,14 +11022,14 @@ class _Renderer_ModelFunction extends RendererBase<ModelFunction> {
   }
 }
 
-void _render_ModelFunctionTyped(ModelFunctionTyped context,
+void _render_ModelFunctionTyped(ModelFunctionTyped? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_ModelFunctionTyped(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
+class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends ModelFunctionTyped>() =>
@@ -10512,7 +11049,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['FunctionTypedElement']);
+                        getters: _invisibleGetters['FunctionTypedElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -10525,8 +11062,10 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10546,8 +11085,10 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10566,8 +11107,10 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10592,8 +11135,10 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10611,8 +11156,10 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Callable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Callable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10631,8 +11178,10 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10651,7 +11200,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -10665,7 +11214,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'typeParameters': Property(
@@ -10681,14 +11230,14 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_ModelFunctionTyped(ModelFunctionTyped context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ModelFunctionTyped(ModelFunctionTyped? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ModelFunctionTyped> getProperty(String key) {
+  Property<ModelFunctionTyped?>? getProperty(String key) {
     if (propertyMap<ModelFunctionTyped>().containsKey(key)) {
       return propertyMap<ModelFunctionTyped>()[key];
     } else {
@@ -10697,7 +11246,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped> {
   }
 }
 
-class _Renderer_Nameable extends RendererBase<Nameable> {
+class _Renderer_Nameable extends RendererBase<Nameable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Nameable>() =>
       _propertyMapCache.putIfAbsent(
@@ -10714,8 +11263,10 @@ class _Renderer_Nameable extends RendererBase<Nameable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10734,8 +11285,10 @@ class _Renderer_Nameable extends RendererBase<Nameable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10753,8 +11306,10 @@ class _Renderer_Nameable extends RendererBase<Nameable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.namePart == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10773,17 +11328,17 @@ class _Renderer_Nameable extends RendererBase<Nameable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.namePieces, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Set']);
+                        parent: r, getters: _invisibleGetters['Set']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Nameable(Nameable context, RendererBase<Object> parent,
+  _Renderer_Nameable(Nameable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Nameable> getProperty(String key) {
+  Property<Nameable?>? getProperty(String key) {
     if (propertyMap<Nameable>().containsKey(key)) {
       return propertyMap<Nameable>()[key];
     } else {
@@ -10792,7 +11347,7 @@ class _Renderer_Nameable extends RendererBase<Nameable> {
   }
 }
 
-class _Renderer_Object extends RendererBase<Object> {
+class _Renderer_Object extends RendererBase<Object?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Object>() =>
       _propertyMapCache.putIfAbsent(
@@ -10807,17 +11362,17 @@ class _Renderer_Object extends RendererBase<Object> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Object(Object context, RendererBase<Object> parent,
+  _Renderer_Object(Object? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Object> getProperty(String key) {
+  Property<Object?>? getProperty(String key) {
     if (propertyMap<Object>().containsKey(key)) {
       return propertyMap<Object>()[key];
     } else {
@@ -10826,14 +11381,14 @@ class _Renderer_Object extends RendererBase<Object> {
   }
 }
 
-void _render_Operator(Operator context, List<MustachioNode> ast,
+void _render_Operator(Operator? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Operator(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Operator extends RendererBase<Operator> {
+class _Renderer_Operator extends RendererBase<Operator?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Operator>() =>
       _propertyMapCache.putIfAbsent(
@@ -10850,8 +11405,10 @@ class _Renderer_Operator extends RendererBase<Operator> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10870,8 +11427,10 @@ class _Renderer_Operator extends RendererBase<Operator> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10897,8 +11456,10 @@ class _Renderer_Operator extends RendererBase<Operator> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10916,8 +11477,10 @@ class _Renderer_Operator extends RendererBase<Operator> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.referenceName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -10926,14 +11489,14 @@ class _Renderer_Operator extends RendererBase<Operator> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Operator(Operator context, RendererBase<Object> parent,
+  _Renderer_Operator(Operator? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Operator> getProperty(String key) {
+  Property<Operator?>? getProperty(String key) {
     if (propertyMap<Operator>().containsKey(key)) {
       return propertyMap<Operator>()[key];
     } else {
@@ -10942,14 +11505,14 @@ class _Renderer_Operator extends RendererBase<Operator> {
   }
 }
 
-void _render_Package(Package context, List<MustachioNode> ast,
+void _render_Package(Package? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Package(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Package extends RendererBase<Package> {
+class _Renderer_Package extends RendererBase<Package?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Package>() =>
       _propertyMapCache.putIfAbsent(
@@ -10984,8 +11547,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.baseHref == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11004,8 +11569,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.canonicalLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11048,7 +11615,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'config': Property(
@@ -11062,7 +11629,7 @@ class _Renderer_Package extends RendererBase<Package> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DartdocOptionContext']);
+                        getters: _invisibleGetters['DartdocOptionContext']!);
                   },
                 ),
                 'containerOrder': Property(
@@ -11087,8 +11654,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_LibraryContainer.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as LibraryContainer,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.defaultCategory == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11108,8 +11677,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentation == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11128,8 +11699,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentationAsHtml == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11147,7 +11720,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentationFile, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['File']);
+                        parent: r, getters: _invisibleGetters['File']!);
                   },
                 ),
                 'documentationFrom': Property(
@@ -11160,7 +11733,7 @@ class _Renderer_Package extends RendererBase<Package> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.documentationFrom.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Locatable']));
+                        parent: r, getters: _invisibleGetters['Locatable']!));
                   },
                 ),
                 'documentedCategories': Property(
@@ -11198,7 +11771,7 @@ class _Renderer_Package extends RendererBase<Package> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentedWhere, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['DocumentLocation']);
+                        getters: _invisibleGetters['DocumentLocation']!);
                   },
                 ),
                 'element': Property(
@@ -11210,7 +11783,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Element']);
+                        parent: r, getters: _invisibleGetters['Element']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -11223,14 +11796,16 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Warnable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Warnable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.enclosingElement, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Warnable']);
+                        parent: r, getters: _invisibleGetters['Warnable']!);
                   },
                 ),
                 'enclosingName': Property(
@@ -11243,8 +11818,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11263,8 +11840,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11283,8 +11862,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11303,8 +11884,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fullyQualifiedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11358,8 +11941,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.homepage == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11378,8 +11963,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11439,8 +12026,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11458,8 +12047,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.location == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11490,8 +12081,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11509,7 +12102,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.nameToCategory, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'oneLineDoc': Property(
@@ -11522,8 +12115,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.oneLineDoc == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11542,8 +12137,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11562,7 +12159,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageGraph']);
+                        parent: r, getters: _invisibleGetters['PackageGraph']!);
                   },
                 ),
                 'packageMeta': Property(
@@ -11575,7 +12172,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageMeta, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['PackageMeta']);
+                        parent: r, getters: _invisibleGetters['PackageMeta']!);
                   },
                 ),
                 'packagePath': Property(
@@ -11588,8 +12185,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.packagePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11620,7 +12219,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceName': Property(
@@ -11633,8 +12232,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.referenceName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11654,7 +12255,7 @@ class _Renderer_Package extends RendererBase<Package> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'toolInvocationIndex': Property(
@@ -11666,7 +12267,7 @@ class _Renderer_Package extends RendererBase<Package> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.toolInvocationIndex, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'usedAnimationIdsByHref': Property(
@@ -11680,7 +12281,7 @@ class _Renderer_Package extends RendererBase<Package> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
                         c.usedAnimationIdsByHref, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'version': Property(
@@ -11693,8 +12294,10 @@ class _Renderer_Package extends RendererBase<Package> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.version == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11702,14 +12305,14 @@ class _Renderer_Package extends RendererBase<Package> {
                     _render_String(c.version, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Package(Package context, RendererBase<Object> parent,
+  _Renderer_Package(Package? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Package> getProperty(String key) {
+  Property<Package?>? getProperty(String key) {
     if (propertyMap<Package>().containsKey(key)) {
       return propertyMap<Package>()[key];
     } else {
@@ -11718,20 +12321,20 @@ class _Renderer_Package extends RendererBase<Package> {
   }
 }
 
-String renderIndex(PackageTemplateData context, Template template) {
+String renderIndex(PackageTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_PackageTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_PackageTemplateData(PackageTemplateData context,
+void _render_PackageTemplateData(PackageTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_PackageTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
+class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends PackageTemplateData>() =>
@@ -11756,8 +12359,10 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.homepage == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11776,8 +12381,10 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11803,8 +12410,10 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11823,8 +12432,10 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11856,8 +12467,10 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11876,8 +12489,10 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11895,8 +12510,10 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11904,14 +12521,14 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_PackageTemplateData(PackageTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_PackageTemplateData(PackageTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<PackageTemplateData> getProperty(String key) {
+  Property<PackageTemplateData?>? getProperty(String key) {
     if (propertyMap<PackageTemplateData>().containsKey(key)) {
       return propertyMap<PackageTemplateData>()[key];
     } else {
@@ -11920,20 +12537,20 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData> {
   }
 }
 
-String renderError(PackageTemplateData context, Template template) {
+String renderError(PackageTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_PackageTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_Parameter(Parameter context, List<MustachioNode> ast,
+void _render_Parameter(Parameter? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Parameter(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Parameter extends RendererBase<Parameter> {
+class _Renderer_Parameter extends RendererBase<Parameter?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Parameter>() =>
       _propertyMapCache.putIfAbsent(
@@ -11950,8 +12567,10 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.defaultValue == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -11971,7 +12590,7 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ParameterElement']);
+                        getters: _invisibleGetters['ParameterElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -11984,8 +12603,10 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12005,8 +12626,10 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12031,7 +12654,7 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'href': Property(
@@ -12044,8 +12667,10 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12063,8 +12688,10 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlId == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12117,8 +12744,10 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12136,8 +12765,10 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12157,7 +12788,7 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.originalMember, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['ParameterMember']);
+                        getters: _invisibleGetters['ParameterMember']!);
                   },
                 ),
                 'referenceChildren': Property(
@@ -12170,7 +12801,7 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -12184,17 +12815,17 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Parameter(Parameter context, RendererBase<Object> parent,
+  _Renderer_Parameter(Parameter? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Parameter> getProperty(String key) {
+  Property<Parameter?>? getProperty(String key) {
     if (propertyMap<Parameter>().containsKey(key)) {
       return propertyMap<Parameter>()[key];
     } else {
@@ -12203,16 +12834,16 @@ class _Renderer_Parameter extends RendererBase<Parameter> {
   }
 }
 
-void _render_ParameterizedElementType(ParameterizedElementType context,
+void _render_ParameterizedElementType(ParameterizedElementType? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_ParameterizedElementType(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_ParameterizedElementType
-    extends RendererBase<ParameterizedElementType> {
+    extends RendererBase<ParameterizedElementType?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>>
       propertyMap<CT_ extends ParameterizedElementType>() =>
@@ -12232,7 +12863,7 @@ class _Renderer_ParameterizedElementType
                           List<MustachioNode> ast, StringSink sink) {
                         renderSimple(c.type, ast, r.template, sink,
                             parent: r,
-                            getters: _invisibleGetters['ParameterizedType']);
+                            getters: _invisibleGetters['ParameterizedType']!);
                       },
                     ),
                     'typeArguments': Property(
@@ -12248,14 +12879,14 @@ class _Renderer_ParameterizedElementType
                             parent: r));
                       },
                     ),
-                  });
+                  }) as Map<String, Property<CT_>>;
 
-  _Renderer_ParameterizedElementType(ParameterizedElementType context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_ParameterizedElementType(ParameterizedElementType? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<ParameterizedElementType> getProperty(String key) {
+  Property<ParameterizedElementType?>? getProperty(String key) {
     if (propertyMap<ParameterizedElementType>().containsKey(key)) {
       return propertyMap<ParameterizedElementType>()[key];
     } else {
@@ -12264,7 +12895,7 @@ class _Renderer_ParameterizedElementType
   }
 }
 
-class _Renderer_Privacy extends RendererBase<Privacy> {
+class _Renderer_Privacy extends RendererBase<Privacy?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Privacy>() =>
       _propertyMapCache.putIfAbsent(
@@ -12278,14 +12909,14 @@ class _Renderer_Privacy extends RendererBase<Privacy> {
                       self.renderSimpleVariable(c, remainingNames, 'bool'),
                   getBool: (CT_ c) => c.isPublic == true,
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Privacy(Privacy context, RendererBase<Object> parent,
+  _Renderer_Privacy(Privacy? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Privacy> getProperty(String key) {
+  Property<Privacy?>? getProperty(String key) {
     if (propertyMap<Privacy>().containsKey(key)) {
       return propertyMap<Privacy>()[key];
     } else {
@@ -12294,22 +12925,22 @@ class _Renderer_Privacy extends RendererBase<Privacy> {
   }
 }
 
-String renderProperty(PropertyTemplateData context, Template template) {
+String renderProperty(PropertyTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_PropertyTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_PropertyTemplateData(PropertyTemplateData context,
+void _render_PropertyTemplateData(PropertyTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_PropertyTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_PropertyTemplateData
-    extends RendererBase<PropertyTemplateData> {
+    extends RendererBase<PropertyTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends PropertyTemplateData>() =>
@@ -12327,8 +12958,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.container == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12347,8 +12980,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12367,8 +13002,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12387,8 +13024,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12407,8 +13046,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12452,8 +13093,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Field.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Field,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.property == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12471,8 +13114,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Field.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Field,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12490,8 +13135,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForContainer == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12510,8 +13157,10 @@ class _Renderer_PropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12519,14 +13168,14 @@ class _Renderer_PropertyTemplateData
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_PropertyTemplateData(PropertyTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_PropertyTemplateData(PropertyTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<PropertyTemplateData> getProperty(String key) {
+  Property<PropertyTemplateData?>? getProperty(String key) {
     if (propertyMap<PropertyTemplateData>().containsKey(key)) {
       return propertyMap<PropertyTemplateData>()[key];
     } else {
@@ -12535,7 +13184,7 @@ class _Renderer_PropertyTemplateData
   }
 }
 
-class _Renderer_Rendered extends RendererBase<Rendered> {
+class _Renderer_Rendered extends RendererBase<Rendered?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Rendered>() =>
       _propertyMapCache.putIfAbsent(
@@ -12551,8 +13200,10 @@ class _Renderer_Rendered extends RendererBase<Rendered> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12571,8 +13222,10 @@ class _Renderer_Rendered extends RendererBase<Rendered> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nameWithGenerics == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12581,14 +13234,14 @@ class _Renderer_Rendered extends RendererBase<Rendered> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Rendered(Rendered context, RendererBase<Object> parent,
+  _Renderer_Rendered(Rendered? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Rendered> getProperty(String key) {
+  Property<Rendered?>? getProperty(String key) {
     if (propertyMap<Rendered>().containsKey(key)) {
       return propertyMap<Rendered>()[key];
     } else {
@@ -12597,7 +13250,7 @@ class _Renderer_Rendered extends RendererBase<Rendered> {
   }
 }
 
-class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
+class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends SourceCodeMixin>() =>
@@ -12616,7 +13269,7 @@ class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.characterLocation, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CharacterLocation']);
+                        getters: _invisibleGetters['CharacterLocation']!);
                   },
                 ),
                 'element': Property(
@@ -12628,7 +13281,7 @@ class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Element']);
+                        parent: r, getters: _invisibleGetters['Element']!);
                   },
                 ),
                 'hasSourceCode': Property(
@@ -12648,8 +13301,10 @@ class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12667,7 +13322,7 @@ class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelNode, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['ModelNode']);
+                        parent: r, getters: _invisibleGetters['ModelNode']!);
                   },
                 ),
                 'sourceCode': Property(
@@ -12680,8 +13335,10 @@ class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sourceCode == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12690,14 +13347,14 @@ class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_SourceCodeMixin(SourceCodeMixin context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_SourceCodeMixin(SourceCodeMixin? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<SourceCodeMixin> getProperty(String key) {
+  Property<SourceCodeMixin?>? getProperty(String key) {
     if (propertyMap<SourceCodeMixin>().containsKey(key)) {
       return propertyMap<SourceCodeMixin>()[key];
     } else {
@@ -12706,14 +13363,14 @@ class _Renderer_SourceCodeMixin extends RendererBase<SourceCodeMixin> {
   }
 }
 
-void _render_String(
-    String context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+void _render_String(String? context, List<MustachioNode> ast, Template template,
+    StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_String(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_String extends RendererBase<String> {
+class _Renderer_String extends RendererBase<String?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends String>() =>
       _propertyMapCache.putIfAbsent(
@@ -12729,7 +13386,7 @@ class _Renderer_String extends RendererBase<String> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.codeUnits.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']));
+                        parent: r, getters: _invisibleGetters['int']!));
                   },
                 ),
                 'hashCode': Property(
@@ -12741,7 +13398,7 @@ class _Renderer_String extends RendererBase<String> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'isEmpty': Property(
@@ -12767,7 +13424,7 @@ class _Renderer_String extends RendererBase<String> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.length, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'runes': Property(
@@ -12779,17 +13436,17 @@ class _Renderer_String extends RendererBase<String> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.runes.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']));
+                        parent: r, getters: _invisibleGetters['int']!));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_String(String context, RendererBase<Object> parent,
+  _Renderer_String(String? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<String> getProperty(String key) {
+  Property<String?>? getProperty(String key) {
     if (propertyMap<String>().containsKey(key)) {
       return propertyMap<String>()[key];
     } else {
@@ -12799,7 +13456,7 @@ class _Renderer_String extends RendererBase<String> {
 }
 
 class _Renderer_TemplateData<T extends Documentable>
-    extends RendererBase<TemplateData<T>> {
+    extends RendererBase<TemplateData<T>?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<T extends Documentable,
           CT_ extends TemplateData>() =>
@@ -12817,8 +13474,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.bareHref == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12837,8 +13496,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.customFooter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12857,8 +13518,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.customHeader == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12877,8 +13540,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.customInnerFooter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12897,8 +13562,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.defaultPackage == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12931,8 +13598,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.homepage == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12951,8 +13620,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -12972,7 +13643,7 @@ class _Renderer_TemplateData<T extends Documentable>
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.htmlOptions, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['TemplateOptions']);
+                        getters: _invisibleGetters['TemplateOptions']!);
                   },
                 ),
                 'includeVersion': Property(
@@ -12992,8 +13663,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13024,8 +13697,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13069,8 +13744,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Documentable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Documentable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.parent == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13089,8 +13766,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.relCanonicalPrefix == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13109,8 +13788,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Documentable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Documentable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13129,8 +13810,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13155,8 +13838,10 @@ class _Renderer_TemplateData<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.version == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13164,16 +13849,16 @@ class _Renderer_TemplateData<T extends Documentable>
                     _render_String(c.version, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TemplateData(TemplateData<T> context, RendererBase<Object> parent,
+  _Renderer_TemplateData(TemplateData<T>? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TemplateData<T>> getProperty(String key) {
-    if (propertyMap<T, TemplateData>().containsKey(key)) {
-      return propertyMap<T, TemplateData>()[key];
+  Property<TemplateData<T>?>? getProperty(String key) {
+    if (propertyMap<T, TemplateData<T>>().containsKey(key)) {
+      return propertyMap<T, TemplateData<T>>()[key];
     } else {
       return null;
     }
@@ -13181,25 +13866,25 @@ class _Renderer_TemplateData<T extends Documentable>
 }
 
 String renderSidebarForContainer<T extends Documentable>(
-    TemplateDataWithContainer<T> context, Template template) {
+    TemplateDataWithContainer<T>? context, Template template) {
   var buffer = StringBuffer();
   _render_TemplateDataWithContainer(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
 void _render_TemplateDataWithContainer<T extends Documentable>(
-    TemplateDataWithContainer<T> context,
+    TemplateDataWithContainer<T>? context,
     List<MustachioNode> ast,
     Template template,
     StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_TemplateDataWithContainer(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_TemplateDataWithContainer<T extends Documentable>
-    extends RendererBase<TemplateDataWithContainer<T>> {
+    extends RendererBase<TemplateDataWithContainer<T>?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<T extends Documentable,
           CT_ extends TemplateDataWithContainer>() =>
@@ -13217,8 +13902,10 @@ class _Renderer_TemplateDataWithContainer<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Container.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Container,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.container == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13227,16 +13914,16 @@ class _Renderer_TemplateDataWithContainer<T extends Documentable>
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TemplateDataWithContainer(TemplateDataWithContainer<T> context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_TemplateDataWithContainer(TemplateDataWithContainer<T>? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TemplateDataWithContainer<T>> getProperty(String key) {
-    if (propertyMap<T, TemplateDataWithContainer>().containsKey(key)) {
-      return propertyMap<T, TemplateDataWithContainer>()[key];
+  Property<TemplateDataWithContainer<T>?>? getProperty(String key) {
+    if (propertyMap<T, TemplateDataWithContainer<T>>().containsKey(key)) {
+      return propertyMap<T, TemplateDataWithContainer<T>>()[key];
     } else {
       return null;
     }
@@ -13244,25 +13931,25 @@ class _Renderer_TemplateDataWithContainer<T extends Documentable>
 }
 
 String renderSidebarForLibrary<T extends Documentable>(
-    TemplateDataWithLibrary<T> context, Template template) {
+    TemplateDataWithLibrary<T>? context, Template template) {
   var buffer = StringBuffer();
   _render_TemplateDataWithLibrary(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
 void _render_TemplateDataWithLibrary<T extends Documentable>(
-    TemplateDataWithLibrary<T> context,
+    TemplateDataWithLibrary<T>? context,
     List<MustachioNode> ast,
     Template template,
     StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_TemplateDataWithLibrary(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_TemplateDataWithLibrary<T extends Documentable>
-    extends RendererBase<TemplateDataWithLibrary<T>> {
+    extends RendererBase<TemplateDataWithLibrary<T>?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<T extends Documentable,
           CT_ extends TemplateDataWithLibrary>() =>
@@ -13280,8 +13967,10 @@ class _Renderer_TemplateDataWithLibrary<T extends Documentable>
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13290,23 +13979,23 @@ class _Renderer_TemplateDataWithLibrary<T extends Documentable>
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TemplateDataWithLibrary(TemplateDataWithLibrary<T> context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_TemplateDataWithLibrary(TemplateDataWithLibrary<T>? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TemplateDataWithLibrary<T>> getProperty(String key) {
-    if (propertyMap<T, TemplateDataWithLibrary>().containsKey(key)) {
-      return propertyMap<T, TemplateDataWithLibrary>()[key];
+  Property<TemplateDataWithLibrary<T>?>? getProperty(String key) {
+    if (propertyMap<T, TemplateDataWithLibrary<T>>().containsKey(key)) {
+      return propertyMap<T, TemplateDataWithLibrary<T>>()[key];
     } else {
       return null;
     }
   }
 }
 
-class _Renderer_TopLevelContainer extends RendererBase<TopLevelContainer> {
+class _Renderer_TopLevelContainer extends RendererBase<TopLevelContainer?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends TopLevelContainer>() =>
@@ -13385,7 +14074,7 @@ class _Renderer_TopLevelContainer extends RendererBase<TopLevelContainer> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.functions, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Iterable']);
+                        parent: r, getters: _invisibleGetters['Iterable']!);
                   },
                 ),
                 'hasPublicClasses': Property(
@@ -13710,14 +14399,14 @@ class _Renderer_TopLevelContainer extends RendererBase<TopLevelContainer> {
                         _render_Typedef(e, ast, r.template, sink, parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TopLevelContainer(TopLevelContainer context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_TopLevelContainer(TopLevelContainer? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TopLevelContainer> getProperty(String key) {
+  Property<TopLevelContainer?>? getProperty(String key) {
     if (propertyMap<TopLevelContainer>().containsKey(key)) {
       return propertyMap<TopLevelContainer>()[key];
     } else {
@@ -13727,22 +14416,22 @@ class _Renderer_TopLevelContainer extends RendererBase<TopLevelContainer> {
 }
 
 String renderTopLevelProperty(
-    TopLevelPropertyTemplateData context, Template template) {
+    TopLevelPropertyTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_TopLevelPropertyTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_TopLevelPropertyTemplateData(TopLevelPropertyTemplateData context,
+void _render_TopLevelPropertyTemplateData(TopLevelPropertyTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer =
       _Renderer_TopLevelPropertyTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
 class _Renderer_TopLevelPropertyTemplateData
-    extends RendererBase<TopLevelPropertyTemplateData> {
+    extends RendererBase<TopLevelPropertyTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends TopLevelPropertyTemplateData>() =>
@@ -13760,8 +14449,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13780,8 +14471,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13800,8 +14493,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13820,8 +14515,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13853,8 +14550,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_TopLevelVariable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as TopLevelVariable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.property == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13873,8 +14572,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_TopLevelVariable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as TopLevelVariable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13893,8 +14594,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13913,8 +14616,10 @@ class _Renderer_TopLevelPropertyTemplateData
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13922,14 +14627,14 @@ class _Renderer_TopLevelPropertyTemplateData
                     _render_String(c.title, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TopLevelPropertyTemplateData(TopLevelPropertyTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_TopLevelPropertyTemplateData(TopLevelPropertyTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TopLevelPropertyTemplateData> getProperty(String key) {
+  Property<TopLevelPropertyTemplateData?>? getProperty(String key) {
     if (propertyMap<TopLevelPropertyTemplateData>().containsKey(key)) {
       return propertyMap<TopLevelPropertyTemplateData>()[key];
     } else {
@@ -13938,14 +14643,14 @@ class _Renderer_TopLevelPropertyTemplateData
   }
 }
 
-void _render_TopLevelVariable(TopLevelVariable context, List<MustachioNode> ast,
-    Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+void _render_TopLevelVariable(TopLevelVariable? context,
+    List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_TopLevelVariable(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
+class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends TopLevelVariable>() =>
@@ -13965,8 +14670,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.documentation == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -13985,8 +14692,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14006,7 +14715,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.features.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Feature']));
+                        parent: r, getters: _invisibleGetters['Feature']!));
                   },
                 ),
                 'fileName': Property(
@@ -14019,8 +14728,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.fileName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14039,8 +14750,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14059,8 +14772,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Accessor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Accessor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.getter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14079,8 +14794,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14126,8 +14843,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14145,8 +14864,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14165,8 +14886,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14186,7 +14909,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'setter': Property(
@@ -14199,8 +14922,10 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Accessor.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Accessor,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.setter == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14209,14 +14934,14 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TopLevelVariable(TopLevelVariable context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_TopLevelVariable(TopLevelVariable? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TopLevelVariable> getProperty(String key) {
+  Property<TopLevelVariable?>? getProperty(String key) {
     if (propertyMap<TopLevelVariable>().containsKey(key)) {
       return propertyMap<TopLevelVariable>()[key];
     } else {
@@ -14225,7 +14950,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable> {
   }
 }
 
-class _Renderer_TypeImplementing extends RendererBase<TypeImplementing> {
+class _Renderer_TypeImplementing extends RendererBase<TypeImplementing?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends TypeImplementing>() =>
@@ -14318,14 +15043,14 @@ class _Renderer_TypeImplementing extends RendererBase<TypeImplementing> {
                             parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TypeImplementing(TypeImplementing context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_TypeImplementing(TypeImplementing? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TypeImplementing> getProperty(String key) {
+  Property<TypeImplementing?>? getProperty(String key) {
     if (propertyMap<TypeImplementing>().containsKey(key)) {
       return propertyMap<TypeImplementing>()[key];
     } else {
@@ -14334,14 +15059,14 @@ class _Renderer_TypeImplementing extends RendererBase<TypeImplementing> {
   }
 }
 
-void _render_TypeParameter(TypeParameter context, List<MustachioNode> ast,
+void _render_TypeParameter(TypeParameter? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_TypeParameter(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
+class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends TypeParameter>() =>
       _propertyMapCache.putIfAbsent(
@@ -14358,8 +15083,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.boundType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14379,7 +15106,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['TypeParameterElement']);
+                        getters: _invisibleGetters['TypeParameterElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -14392,8 +15119,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ModelElement.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ModelElement,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14413,8 +15142,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14440,8 +15171,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14459,8 +15192,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14478,8 +15213,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14498,8 +15235,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.name == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14517,7 +15256,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceName': Property(
@@ -14530,8 +15269,10 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.referenceName == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14551,17 +15292,17 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TypeParameter(TypeParameter context, RendererBase<Object> parent,
+  _Renderer_TypeParameter(TypeParameter? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TypeParameter> getProperty(String key) {
+  Property<TypeParameter?>? getProperty(String key) {
     if (propertyMap<TypeParameter>().containsKey(key)) {
       return propertyMap<TypeParameter>()[key];
     } else {
@@ -14570,7 +15311,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter> {
   }
 }
 
-class _Renderer_TypeParameters extends RendererBase<TypeParameters> {
+class _Renderer_TypeParameters extends RendererBase<TypeParameters?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends TypeParameters>() =>
       _propertyMapCache.putIfAbsent(
@@ -14586,8 +15327,10 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.genericParameters == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14613,8 +15356,10 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedGenericParameters == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14634,8 +15379,10 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nameWithGenerics == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14654,8 +15401,10 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nameWithLinkedGenerics == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14678,14 +15427,14 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TypeParameters(TypeParameters context, RendererBase<Object> parent,
-      Template template, StringSink sink)
+  _Renderer_TypeParameters(TypeParameters? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TypeParameters> getProperty(String key) {
+  Property<TypeParameters?>? getProperty(String key) {
     if (propertyMap<TypeParameters>().containsKey(key)) {
       return propertyMap<TypeParameters>()[key];
     } else {
@@ -14694,14 +15443,14 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters> {
   }
 }
 
-void _render_Typedef(Typedef context, List<MustachioNode> ast,
+void _render_Typedef(Typedef? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_Typedef(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_Typedef extends RendererBase<Typedef> {
+class _Renderer_Typedef extends RendererBase<Typedef?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Typedef>() =>
       _propertyMapCache.putIfAbsent(
@@ -14719,7 +15468,7 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.aliasedType, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['DartType']);
+                        parent: r, getters: _invisibleGetters['DartType']!);
                   },
                 ),
                 'asCallable': Property(
@@ -14732,8 +15481,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_FunctionTypedef.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as FunctionTypedef,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.asCallable == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14753,7 +15504,7 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['TypeAliasElement']);
+                        getters: _invisibleGetters['TypeAliasElement']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -14766,8 +15517,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14786,8 +15539,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.filePath == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14806,8 +15561,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.genericParameters == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14826,8 +15583,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.href == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14852,8 +15611,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.kind == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14871,8 +15632,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14891,8 +15654,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.linkedGenericParameters == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14912,8 +15677,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_ElementType.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as ElementType,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.modelType == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14932,8 +15699,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.nameWithGenerics == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14952,8 +15721,10 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -14972,7 +15743,7 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Map']);
+                        parent: r, getters: _invisibleGetters['Map']!);
                   },
                 ),
                 'referenceParents': Property(
@@ -14986,7 +15757,7 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                     return c.referenceParents.map((e) => renderSimple(
                         e, ast, r.template, sink,
                         parent: r,
-                        getters: _invisibleGetters['CommentReferable']));
+                        getters: _invisibleGetters['CommentReferable']!));
                   },
                 ),
                 'typeParameters': Property(
@@ -15002,14 +15773,14 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
                         parent: r));
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Typedef(Typedef context, RendererBase<Object> parent,
+  _Renderer_Typedef(Typedef? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Typedef> getProperty(String key) {
+  Property<Typedef?>? getProperty(String key) {
     if (propertyMap<Typedef>().containsKey(key)) {
       return propertyMap<Typedef>()[key];
     } else {
@@ -15018,20 +15789,20 @@ class _Renderer_Typedef extends RendererBase<Typedef> {
   }
 }
 
-String renderTypedef(TypedefTemplateData context, Template template) {
+String renderTypedef(TypedefTemplateData? context, Template template) {
   var buffer = StringBuffer();
   _render_TypedefTemplateData(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
-void _render_TypedefTemplateData(TypedefTemplateData context,
+void _render_TypedefTemplateData(TypedefTemplateData? context,
     List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = _Renderer_TypedefTemplateData(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
+class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<
           CT_ extends TypedefTemplateData>() =>
@@ -15049,8 +15820,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.htmlBase == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15069,8 +15842,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.layoutTitle == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15089,8 +15864,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Library.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Library,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.library == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15109,8 +15886,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.metaDescription == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15142,8 +15921,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Typedef.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Typedef,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.self == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15161,8 +15942,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.sidebarForLibrary == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15181,8 +15964,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_String.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as String,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.title == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15200,8 +15985,10 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Typedef.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Typedef,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.typeDef == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15210,14 +15997,14 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_TypedefTemplateData(TypedefTemplateData context,
-      RendererBase<Object> parent, Template template, StringSink sink)
+  _Renderer_TypedefTemplateData(TypedefTemplateData? context,
+      RendererBase<Object>? parent, Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<TypedefTemplateData> getProperty(String key) {
+  Property<TypedefTemplateData?>? getProperty(String key) {
     if (propertyMap<TypedefTemplateData>().containsKey(key)) {
       return propertyMap<TypedefTemplateData>()[key];
     } else {
@@ -15226,7 +16013,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData> {
   }
 }
 
-class _Renderer_Warnable extends RendererBase<Warnable> {
+class _Renderer_Warnable extends RendererBase<Warnable?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Warnable>() =>
       _propertyMapCache.putIfAbsent(
@@ -15241,7 +16028,7 @@ class _Renderer_Warnable extends RendererBase<Warnable> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Element']);
+                        parent: r, getters: _invisibleGetters['Element']!);
                   },
                 ),
                 'enclosingElement': Property(
@@ -15254,14 +16041,16 @@ class _Renderer_Warnable extends RendererBase<Warnable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Warnable.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Warnable,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.enclosingElement == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.enclosingElement, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Warnable']);
+                        parent: r, getters: _invisibleGetters['Warnable']!);
                   },
                 ),
                 'package': Property(
@@ -15274,8 +16063,10 @@ class _Renderer_Warnable extends RendererBase<Warnable> {
                     var name = remainingNames.first;
                     var nextProperty =
                         _Renderer_Package.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Package,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.package == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -15284,14 +16075,14 @@ class _Renderer_Warnable extends RendererBase<Warnable> {
                         parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  _Renderer_Warnable(Warnable context, RendererBase<Object> parent,
+  _Renderer_Warnable(Warnable? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Warnable> getProperty(String key) {
+  Property<Warnable?>? getProperty(String key) {
     if (propertyMap<Warnable>().containsKey(key)) {
       return propertyMap<Warnable>()[key];
     } else {
diff --git a/lib/src/mustachio/renderer_base.dart b/lib/src/mustachio/renderer_base.dart
index c179c2f43e..ba5cc504d9 100644
--- a/lib/src/mustachio/renderer_base.dart
+++ b/lib/src/mustachio/renderer_base.dart
@@ -289,16 +289,16 @@ abstract class RendererBase<T extends Object?> {
 }
 
 String renderSimple(
-    Object context, List<MustachioNode> ast, Template template, StringSink sink,
+    Object? context, List<MustachioNode> ast, Template template, StringSink sink,
     {required RendererBase<Object> parent, required Set<String> getters}) {
   var renderer = SimpleRenderer(context, parent, template, sink, getters);
   renderer.renderBlock(ast);
   return renderer.sink.toString();
 }
 
-class SimpleRenderer extends RendererBase<Object> {
+class SimpleRenderer extends RendererBase<Object?> {
   SimpleRenderer(
-    Object context,
+    Object? context,
     RendererBase<Object> parent,
     Template template,
     StringSink sink,
diff --git a/test/mustachio/foo.dart b/test/mustachio/foo.dart
index e608c984f0..8600431bb4 100644
--- a/test/mustachio/foo.dart
+++ b/test/mustachio/foo.dart
@@ -1,5 +1,3 @@
-// @dart=2.9
-
 @Renderer.forTest(#renderFoo, Context<Foo>(), 'foo',
     visibleTypes: {Property1, Property2, Property3})
 @Renderer.forTest(#renderBar, Context<Bar>(), 'bar')
@@ -9,43 +7,43 @@ library dartdoc.testing.foo;
 import 'package:dartdoc/src/mustachio/annotations.dart';
 
 class FooBase<T extends Object> {
-  T baz;
+  T? baz;
 }
 
 class Foo extends FooBase<Baz> {
-  String s1;
-  bool b1;
-  List<int> l1;
+  String s1 = '';
+  bool b1 = false;
+  List<int> l1 = [];
   @override
   // ignore: overridden_fields
-  Baz baz;
-  Property1 p1;
-  int length;
+  Baz? baz;
+  Property1? p1;
+  int? length;
 }
 
 class Bar {
-  Foo foo;
-  String s2;
-  Baz baz;
-  bool l1;
+  Foo? foo;
+  String? s2;
+  Baz? baz;
+  bool? l1;
 }
 
 class Baz {
-  Bar bar;
+  Bar? bar;
 }
 
 class Property1 {
-  Property2 p2;
+  Property2? p2;
 }
 
 class Property2 with Mixin1 {
-  String s;
+  String? s;
 }
 
 mixin Mixin1 {
-  Property3 p3;
+  Property3? p3;
 }
 
 class Property3 {
-  String s;
+  String? s;
 }
diff --git a/test/mustachio/foo.runtime_renderers.dart b/test/mustachio/foo.runtime_renderers.dart
index 6168845c65..77d48e1b45 100644
--- a/test/mustachio/foo.runtime_renderers.dart
+++ b/test/mustachio/foo.runtime_renderers.dart
@@ -6,7 +6,6 @@
 // ignore_for_file: camel_case_types, deprecated_member_use_from_same_package
 // ignore_for_file: non_constant_identifier_names, unnecessary_string_escapes
 // ignore_for_file: unused_import
-// @dart=2.9
 import 'package:dartdoc/src/element_type.dart';
 import 'package:dartdoc/src/generator/template_data.dart';
 import 'package:dartdoc/src/model/annotation.dart';
@@ -22,20 +21,20 @@ import 'package:dartdoc/src/mustachio/renderer_base.dart';
 import 'package:dartdoc/src/warnings.dart';
 import 'foo.dart';
 
-String renderBar(Bar context, Template template) {
+String renderBar(Bar? context, Template template) {
   var buffer = StringBuffer();
   _render_Bar(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
 void _render_Bar(
-    Bar context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    Bar? context, List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = Renderer_Bar(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class Renderer_Bar extends RendererBase<Bar> {
+class Renderer_Bar extends RendererBase<Bar?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Bar>() =>
       _propertyMapCache.putIfAbsent(
@@ -52,7 +51,7 @@ class Renderer_Bar extends RendererBase<Bar> {
                     var name = remainingNames.first;
                     var nextProperty =
                         Renderer_Baz.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
+                    return nextProperty.renderVariable(self.getValue(c) as Baz,
                         nextProperty, [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.baz == null,
@@ -71,7 +70,7 @@ class Renderer_Bar extends RendererBase<Bar> {
                     var name = remainingNames.first;
                     var nextProperty =
                         Renderer_Foo.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
+                    return nextProperty.renderVariable(self.getValue(c) as Foo,
                         nextProperty, [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.foo == null,
@@ -96,17 +95,17 @@ class Renderer_Bar extends RendererBase<Bar> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.s2, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['String']);
+                        parent: r, getters: _invisibleGetters['String']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Bar(Bar context, RendererBase<Object> parent, Template template,
+  Renderer_Bar(Bar? context, RendererBase<Object>? parent, Template template,
       StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Bar> getProperty(String key) {
+  Property<Bar?>? getProperty(String key) {
     if (propertyMap<Bar>().containsKey(key)) {
       return propertyMap<Bar>()[key];
     } else {
@@ -115,20 +114,20 @@ class Renderer_Bar extends RendererBase<Bar> {
   }
 }
 
-String renderBaz(Baz context, Template template) {
+String renderBaz(Baz? context, Template template) {
   var buffer = StringBuffer();
   _render_Baz(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
 void _render_Baz(
-    Baz context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    Baz? context, List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = Renderer_Baz(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class Renderer_Baz extends RendererBase<Baz> {
+class Renderer_Baz extends RendererBase<Baz?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Baz>() =>
       _propertyMapCache.putIfAbsent(
@@ -145,7 +144,7 @@ class Renderer_Baz extends RendererBase<Baz> {
                     var name = remainingNames.first;
                     var nextProperty =
                         Renderer_Bar.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
+                    return nextProperty.renderVariable(self.getValue(c) as Bar,
                         nextProperty, [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.bar == null,
@@ -154,14 +153,14 @@ class Renderer_Baz extends RendererBase<Baz> {
                     _render_Bar(c.bar, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Baz(Baz context, RendererBase<Object> parent, Template template,
+  Renderer_Baz(Baz? context, RendererBase<Object>? parent, Template template,
       StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Baz> getProperty(String key) {
+  Property<Baz?>? getProperty(String key) {
     if (propertyMap<Baz>().containsKey(key)) {
       return propertyMap<Baz>()[key];
     } else {
@@ -170,20 +169,20 @@ class Renderer_Baz extends RendererBase<Baz> {
   }
 }
 
-String renderFoo(Foo context, Template template) {
+String renderFoo(Foo? context, Template template) {
   var buffer = StringBuffer();
   _render_Foo(context, template.ast, template, buffer);
   return buffer.toString();
 }
 
 void _render_Foo(
-    Foo context, List<MustachioNode> ast, Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    Foo? context, List<MustachioNode> ast, Template template, StringSink sink,
+    {RendererBase<Object>? parent}) {
   var renderer = Renderer_Foo(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class Renderer_Foo extends RendererBase<Foo> {
+class Renderer_Foo extends RendererBase<Foo?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Foo>() =>
       _propertyMapCache.putIfAbsent(
@@ -207,7 +206,7 @@ class Renderer_Foo extends RendererBase<Foo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         Renderer_Baz.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
+                    return nextProperty.renderVariable(self.getValue(c) as Baz,
                         nextProperty, [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.baz == null,
@@ -225,7 +224,7 @@ class Renderer_Foo extends RendererBase<Foo> {
                       List<MustachioNode> ast, StringSink sink) {
                     return c.l1.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']));
+                        parent: r, getters: _invisibleGetters['int']!));
                   },
                 ),
                 'length': Property(
@@ -237,7 +236,7 @@ class Renderer_Foo extends RendererBase<Foo> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.length, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'p1': Property(
@@ -250,8 +249,10 @@ class Renderer_Foo extends RendererBase<Foo> {
                     var name = remainingNames.first;
                     var nextProperty =
                         Renderer_Property1.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Property1,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.p1 == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -268,17 +269,17 @@ class Renderer_Foo extends RendererBase<Foo> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.s1, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['String']);
+                        parent: r, getters: _invisibleGetters['String']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Foo(Foo context, RendererBase<Object> parent, Template template,
+  Renderer_Foo(Foo? context, RendererBase<Object>? parent, Template template,
       StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Foo> getProperty(String key) {
+  Property<Foo?>? getProperty(String key) {
     if (propertyMap<Foo>().containsKey(key)) {
       return propertyMap<Foo>()[key];
     } else {
@@ -287,7 +288,7 @@ class Renderer_Foo extends RendererBase<Foo> {
   }
 }
 
-class Renderer_FooBase<T extends Object> extends RendererBase<FooBase<T>> {
+class Renderer_FooBase<T extends Object> extends RendererBase<FooBase<T>?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>>
       propertyMap<T extends Object, CT_ extends FooBase>() =>
@@ -305,27 +306,29 @@ class Renderer_FooBase<T extends Object> extends RendererBase<FooBase<T>> {
                         var name = remainingNames.first;
                         var nextProperty =
                             Renderer_Object.propertyMap().getValue(name);
-                        return nextProperty.renderVariable(self.getValue(c),
-                            nextProperty, [...remainingNames.skip(1)]);
+                        return nextProperty.renderVariable(
+                            self.getValue(c) as Object,
+                            nextProperty,
+                            [...remainingNames.skip(1)]);
                       },
                     ),
-                  });
+                  }) as Map<String, Property<CT_>>;
 
-  Renderer_FooBase(FooBase<T> context, RendererBase<Object> parent,
+  Renderer_FooBase(FooBase<T>? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<FooBase<T>> getProperty(String key) {
-    if (propertyMap<T, FooBase>().containsKey(key)) {
-      return propertyMap<T, FooBase>()[key];
+  Property<FooBase<T>?>? getProperty(String key) {
+    if (propertyMap<T, FooBase<T>>().containsKey(key)) {
+      return propertyMap<T, FooBase<T>>()[key];
     } else {
       return null;
     }
   }
 }
 
-class Renderer_Mixin1 extends RendererBase<Mixin1> {
+class Renderer_Mixin1 extends RendererBase<Mixin1?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Mixin1>() =>
       _propertyMapCache.putIfAbsent(
@@ -341,8 +344,10 @@ class Renderer_Mixin1 extends RendererBase<Mixin1> {
                     var name = remainingNames.first;
                     var nextProperty =
                         Renderer_Property3.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Property3,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.p3 == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -350,14 +355,14 @@ class Renderer_Mixin1 extends RendererBase<Mixin1> {
                     _render_Property3(c.p3, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Mixin1(Mixin1 context, RendererBase<Object> parent,
+  Renderer_Mixin1(Mixin1? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Mixin1> getProperty(String key) {
+  Property<Mixin1?>? getProperty(String key) {
     if (propertyMap<Mixin1>().containsKey(key)) {
       return propertyMap<Mixin1>()[key];
     } else {
@@ -366,7 +371,7 @@ class Renderer_Mixin1 extends RendererBase<Mixin1> {
   }
 }
 
-class Renderer_Object extends RendererBase<Object> {
+class Renderer_Object extends RendererBase<Object?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Object>() =>
       _propertyMapCache.putIfAbsent(
@@ -381,7 +386,7 @@ class Renderer_Object extends RendererBase<Object> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']);
+                        parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
                 'runtimeType': Property(
@@ -393,17 +398,17 @@ class Renderer_Object extends RendererBase<Object> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.runtimeType, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Type']);
+                        parent: r, getters: _invisibleGetters['Type']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Object(Object context, RendererBase<Object> parent,
+  Renderer_Object(Object? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Object> getProperty(String key) {
+  Property<Object?>? getProperty(String key) {
     if (propertyMap<Object>().containsKey(key)) {
       return propertyMap<Object>()[key];
     } else {
@@ -412,14 +417,14 @@ class Renderer_Object extends RendererBase<Object> {
   }
 }
 
-void _render_Property1(Property1 context, List<MustachioNode> ast,
+void _render_Property1(Property1? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = Renderer_Property1(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class Renderer_Property1 extends RendererBase<Property1> {
+class Renderer_Property1 extends RendererBase<Property1?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Property1>() =>
       _propertyMapCache.putIfAbsent(
@@ -436,8 +441,10 @@ class Renderer_Property1 extends RendererBase<Property1> {
                     var name = remainingNames.first;
                     var nextProperty =
                         Renderer_Property2.propertyMap().getValue(name);
-                    return nextProperty.renderVariable(self.getValue(c),
-                        nextProperty, [...remainingNames.skip(1)]);
+                    return nextProperty.renderVariable(
+                        self.getValue(c) as Property2,
+                        nextProperty,
+                        [...remainingNames.skip(1)]);
                   },
                   isNullValue: (CT_ c) => c.p2 == null,
                   renderValue: (CT_ c, RendererBase<CT_> r,
@@ -445,14 +452,14 @@ class Renderer_Property1 extends RendererBase<Property1> {
                     _render_Property2(c.p2, ast, r.template, sink, parent: r);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Property1(Property1 context, RendererBase<Object> parent,
+  Renderer_Property1(Property1? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Property1> getProperty(String key) {
+  Property<Property1?>? getProperty(String key) {
     if (propertyMap<Property1>().containsKey(key)) {
       return propertyMap<Property1>()[key];
     } else {
@@ -461,14 +468,14 @@ class Renderer_Property1 extends RendererBase<Property1> {
   }
 }
 
-void _render_Property2(Property2 context, List<MustachioNode> ast,
+void _render_Property2(Property2? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = Renderer_Property2(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class Renderer_Property2 extends RendererBase<Property2> {
+class Renderer_Property2 extends RendererBase<Property2?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Property2>() =>
       _propertyMapCache.putIfAbsent(
@@ -485,17 +492,17 @@ class Renderer_Property2 extends RendererBase<Property2> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.s, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['String']);
+                        parent: r, getters: _invisibleGetters['String']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Property2(Property2 context, RendererBase<Object> parent,
+  Renderer_Property2(Property2? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Property2> getProperty(String key) {
+  Property<Property2?>? getProperty(String key) {
     if (propertyMap<Property2>().containsKey(key)) {
       return propertyMap<Property2>()[key];
     } else {
@@ -504,14 +511,14 @@ class Renderer_Property2 extends RendererBase<Property2> {
   }
 }
 
-void _render_Property3(Property3 context, List<MustachioNode> ast,
+void _render_Property3(Property3? context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = Renderer_Property3(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
 
-class Renderer_Property3 extends RendererBase<Property3> {
+class Renderer_Property3 extends RendererBase<Property3?> {
   static final Map<Type, Object> _propertyMapCache = {};
   static Map<String, Property<CT_>> propertyMap<CT_ extends Property3>() =>
       _propertyMapCache.putIfAbsent(
@@ -527,17 +534,17 @@ class Renderer_Property3 extends RendererBase<Property3> {
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.s, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['String']);
+                        parent: r, getters: _invisibleGetters['String']!);
                   },
                 ),
-              });
+              }) as Map<String, Property<CT_>>;
 
-  Renderer_Property3(Property3 context, RendererBase<Object> parent,
+  Renderer_Property3(Property3? context, RendererBase<Object>? parent,
       Template template, StringSink sink)
       : super(context, parent, template, sink);
 
   @override
-  Property<Property3> getProperty(String key) {
+  Property<Property3?>? getProperty(String key) {
     if (propertyMap<Property3>().containsKey(key)) {
       return propertyMap<Property3>()[key];
     } else {
diff --git a/test/mustachio/runtime_renderer_builder_test.dart b/test/mustachio/runtime_renderer_builder_test.dart
index cb87e9c8b6..7aee3c78f4 100644
--- a/test/mustachio/runtime_renderer_builder_test.dart
+++ b/test/mustachio/runtime_renderer_builder_test.dart
@@ -62,13 +62,13 @@ class Baz {}
       expect(
           generatedContent,
           contains(
-              'class _Renderer_FooBase<T extends Baz> extends RendererBase<FooBase<T>>'));
+              'class _Renderer_FooBase<T extends Baz> extends RendererBase<FooBase<T>?>'));
     });
 
     test('for Object', () {
       // The renderer class for Object
       expect(generatedContent,
-          contains('class _Renderer_Object extends RendererBase<Object> {'));
+          contains('class _Renderer_Object extends RendererBase<Object?> {'));
     });
 
     test('for a class which is extended by a rendered class', () {
@@ -133,7 +133,7 @@ class Baz {}
                       List<MustachioNode> ast, StringSink sink) {
                     return c.l1.map((e) => renderSimple(
                         e, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['int']));
+                        parent: r, getters: _invisibleGetters['int']!));
                   },
                 ),
 '''));
@@ -150,7 +150,7 @@ class Baz {}
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.s1, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['String']);
+                        parent: r, getters: _invisibleGetters['String']!);
                   },
                 ),
 '''));
@@ -201,19 +201,19 @@ import 'package:mustachio/annotations.dart';
 
     test('with a corresponding public API function', () async {
       expect(generatedContent,
-          contains('String renderFoo<T>(Foo<T> context, Template template)'));
+          contains('String renderFoo<T>(Foo<T>? context, Template template)'));
     });
 
     test('with a corresponding render function', () async {
       expect(
           generatedContent,
-          contains('void _render_Foo<T>(\n'
-              '    Foo<T> context, List<MustachioNode> ast, Template template, StringSink sink'));
+          contains('void _render_Foo<T>(Foo<T>? context, List<MustachioNode> ast, Template template,\n'
+              '    StringSink sink,\n'));
     });
 
     test('with a generic supertype type argument', () async {
       expect(generatedContent,
-          contains('class _Renderer_Foo<T> extends RendererBase<Foo<T>>'));
+          contains('class _Renderer_Foo<T> extends RendererBase<Foo<T>?>'));
     });
 
     test(
diff --git a/test/mustachio/runtime_renderer_render_test.dart b/test/mustachio/runtime_renderer_render_test.dart
index f28124b04a..6648619b79 100644
--- a/test/mustachio/runtime_renderer_render_test.dart
+++ b/test/mustachio/runtime_renderer_render_test.dart
@@ -471,7 +471,7 @@ World
         () => renderFoo(foo, fooTemplate),
         throwsA(const TypeMatcher<MustachioResolutionError>()
             .having((e) => e.message, 'message', contains('''
-line 1, column 8 of ${fooTemplateFile.path}: Failed to resolve 's2' as a property on any types in the context chain: Foo
+line 1, column 8 of ${fooTemplateFile.path}: Failed to resolve 's2' as a property on any types in the context chain: Foo?
   ╷
 1 │ Text {{s2}}
   │        ^^
@@ -506,8 +506,8 @@ line 1, column 9 of ${fooTemplateFile.path}: Failed to resolve 's2' as a propert
             (e) => e.message,
             'message',
             contains("Failed to resolve 'x' on Foo while resolving [x] as a "
-                'property chain on any types in the context chain: Bar, after '
-                "first resolving 'foo' to a property on Bar"))));
+                'property chain on any types in the context chain: Bar?, after '
+                "first resolving 'foo' to a property on Bar?"))));
   });
 
   test('Renderer throws when it cannot resolve a multi-name section key',
diff --git a/tool/mustachio/codegen_runtime_renderer.dart b/tool/mustachio/codegen_runtime_renderer.dart
index 9078e45ba6..513e9763ac 100644
--- a/tool/mustachio/codegen_runtime_renderer.dart
+++ b/tool/mustachio/codegen_runtime_renderer.dart
@@ -5,6 +5,7 @@
 import 'dart:collection';
 
 import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/nullability_suffix.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/dart/element/type_provider.dart';
 import 'package:analyzer/dart/element/type_system.dart';
@@ -81,7 +82,6 @@ class RuntimeRenderersBuilder {
 // ignore_for_file: camel_case_types, deprecated_member_use_from_same_package
 // ignore_for_file: non_constant_identifier_names, unnecessary_string_escapes
 // ignore_for_file: unused_import
-// @dart=2.9
 import 'package:dartdoc/src/element_type.dart';
 import 'package:dartdoc/src/generator/template_data.dart';
 import 'package:dartdoc/src/model/annotation.dart';
@@ -337,12 +337,13 @@ import '${p.basename(_sourceUri.path)}';
   void _buildRenderer(_RendererInfo renderer,
       {required bool buildOnlyPublicFunction}) {
     var typeName = renderer._typeName;
+    var typeWithVariablesNullable = '$typeName${renderer._typeVariablesString}?';
     var typeWithVariables = '$typeName${renderer._typeVariablesString}';
 
     if (renderer.publicApiFunctionName != null) {
       _buffer.writeln('''
 String ${renderer.publicApiFunctionName}${renderer._typeParametersString}(
-    $typeWithVariables context, Template template) {
+    $typeWithVariablesNullable context, Template template) {
   var buffer = StringBuffer();
   ${renderer._renderFunctionName}(context, template.ast, template, buffer);
   return buffer.toString();
@@ -356,9 +357,9 @@ String ${renderer.publicApiFunctionName}${renderer._typeParametersString}(
     if (renderer.includeRenderFunction) {
       _buffer.writeln('''
 void ${renderer._renderFunctionName}${renderer._typeParametersString}(
-    $typeWithVariables context, List<MustachioNode> ast,
+    $typeWithVariablesNullable context, List<MustachioNode> ast,
     Template template, StringSink sink,
-    {RendererBase<Object> parent}) {
+    {RendererBase<Object>? parent}) {
   var renderer = ${renderer._rendererClassName}(context, parent, template, sink);
   renderer.renderBlock(ast);
 }
@@ -368,22 +369,22 @@ void ${renderer._renderFunctionName}${renderer._typeParametersString}(
     // Write out the renderer class.
     _buffer.write('''
 class ${renderer._rendererClassName}${renderer._typeParametersString}
-    extends RendererBase<$typeWithVariables> {
+    extends RendererBase<$typeWithVariablesNullable> {
 ''');
     _writePropertyMap(renderer);
     // Write out the constructor.
     _buffer.writeln('''
   ${renderer._rendererClassName}(
-        $typeWithVariables context, RendererBase<Object> parent,
+        $typeWithVariablesNullable context, RendererBase<Object>? parent,
         Template template, StringSink sink)
       : super(context, parent, template, sink);
 ''');
-    var propertyMapTypeArguments = renderer._typeArgumentsStringWith(typeName);
+    var propertyMapTypeArguments = renderer._typeArgumentsStringWith(typeWithVariables);
     var propertyMapName = 'propertyMap$propertyMapTypeArguments';
     // Write out `getProperty`.
     _buffer.writeln('''
   @override
-  Property<$typeWithVariables> getProperty(String key) {
+  Property<$typeWithVariablesNullable>? getProperty(String key) {
     if ($propertyMapName().containsKey(key)) {
       return $propertyMapName()[key];
     } else {
@@ -455,7 +456,7 @@ class ${renderer._rendererClassName}${renderer._typeParametersString}
         _writeProperty(renderer, property, returnType.bound as InterfaceType);
       }
     }
-    _buffer.writeln('});');
+    _buffer.writeln('}) as Map<String, Property<$_contextTypeVariable>>;');
     _buffer.writeln('');
   }
 
@@ -473,7 +474,7 @@ class ${renderer._rendererClassName}${renderer._typeParametersString}
         .writeln('getValue: ($_contextTypeVariable c) => c.${property.name},');
 
     var getterName = property.name;
-
+    var getterTypeString = getterType.getDisplayString(withNullability: false);
     // Only add a `getProperties` function, which returns the property map for
     // [getterType], if [getterType] is a renderable type.
     if (_typeToRendererClassName.containsKey(getterType.element)) {
@@ -487,14 +488,13 @@ renderVariable:
   var name = remainingNames.first;
   var nextProperty = $rendererClassName.propertyMap().getValue(name);
   return nextProperty.renderVariable(
-      self.getValue(c), nextProperty, [...remainingNames.skip(1)]);
+      self.getValue(c) as $getterTypeString, nextProperty, [...remainingNames.skip(1)]);
 },
 ''');
     } else {
       // [getterType] does not have a full renderer, so we just render a simple
       // variable, with no opportunity to access fields on [getterType].
-      var getterTypeString =
-          getterType.getDisplayString(withNullability: false);
+
       _buffer.writeln('''
 renderVariable:
     ($_contextTypeVariable c, Property<CT_> self, List<String> remainingNames) =>
@@ -527,7 +527,7 @@ renderVariable:
                   typeName, () => innerType.element.allAccessorNames);
             }
             renderCall = 'renderSimple(e, ast, r.template, sink, parent: r, '
-                "getters: _invisibleGetters['$typeName'])";
+                "getters: _invisibleGetters['$typeName']!)";
           } else {
             renderCall =
                 '$renderFunctionName(e, ast, r.template, sink, parent: r)';
@@ -556,7 +556,7 @@ renderIterable:
               typeName, () => getterType.element.allAccessorNames);
           renderCall =
               'renderSimple(c.$getterName, ast, r.template, sink, parent: r, '
-              "getters: _invisibleGetters['$typeName'])";
+              "getters: _invisibleGetters['$typeName']!)";
         } else {
           renderCall =
               '$renderFunctionName(c.$getterName, ast, r.template, sink, parent: r)';
@@ -660,12 +660,20 @@ class _RendererInfo {
   String _typeParametersStringWith(String extra) =>
       _contextClass.typeParametersStringWith(extra);
 
+  String _renderSingleType(DartType tp) {
+    var displayString = tp.getDisplayString(withNullability: false);
+    var nullabilitySuffix = tp.nullabilitySuffix == NullabilitySuffix.question ? '?' : '';
+    return '$displayString$nullabilitySuffix';
+  }
+
   /// Returns the type arguments of the context type, and [extra], as they
   /// appear in a list of generics.
   String _typeArgumentsStringWith(String extra) {
     return asGenerics([
       ..._contextClass.thisType.typeArguments
-          .map((tp) => tp.getDisplayString(withNullability: false)),
+          // withNullability will give star types, we actually want nullable or
+          // non-nullable only for generation.
+          .map(_renderSingleType),
       extra,
     ]);
   }

From 08e6cdb3eee882eac1deb731958835c0aecdad46 Mon Sep 17 00:00:00 2001
From: Janice Collins <jcollins@google.com>
Date: Wed, 27 Oct 2021 12:51:50 -0700
Subject: [PATCH 2/5] Things seem to work now, if not completely cleanly.

---
 .../templates.runtime_renderers.dart          | 705 +++++++++---------
 lib/src/mustachio/renderer_base.dart          |   4 +-
 test/mustachio/foo.runtime_renderers.dart     |  24 +-
 .../runtime_renderer_builder_test.dart        |   9 +-
 .../runtime_renderer_render_test.dart         |  15 +-
 tool/mustachio/codegen_runtime_renderer.dart  |  15 +-
 6 files changed, 387 insertions(+), 385 deletions(-)

diff --git a/lib/src/generator/templates.runtime_renderers.dart b/lib/src/generator/templates.runtime_renderers.dart
index 87c9ba1f86..8434db8107 100644
--- a/lib/src/generator/templates.runtime_renderers.dart
+++ b/lib/src/generator/templates.runtime_renderers.dart
@@ -64,7 +64,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.definingCombo == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.definingCombo, ast, r.template, sink,
@@ -87,7 +87,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentationComment == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -101,7 +101,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PropertyAccessorElement'),
-                  isNullValue: (CT_ c) => c.element == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
@@ -124,7 +124,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingCombo == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.enclosingCombo, ast, r.template, sink,
@@ -248,7 +248,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -269,7 +269,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -291,7 +291,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Callable(c.modelType, ast, r.template, sink,
@@ -340,7 +340,7 @@ class _Renderer_Accessor extends RendererBase<Accessor?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -420,7 +420,7 @@ class _Renderer_Annotation extends RendererBase<Annotation?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'ElementAnnotation'),
-                  isNullValue: (CT_ c) => c.annotation == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.annotation, ast, r.template, sink,
@@ -433,7 +433,7 @@ class _Renderer_Annotation extends RendererBase<Annotation?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.hashCode == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
@@ -484,7 +484,7 @@ class _Renderer_Annotation extends RendererBase<Annotation?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedName, ast, r.template, sink,
@@ -506,7 +506,7 @@ class _Renderer_Annotation extends RendererBase<Annotation?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedNameWithParameters == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -542,7 +542,7 @@ class _Renderer_Annotation extends RendererBase<Annotation?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -564,7 +564,7 @@ class _Renderer_Annotation extends RendererBase<Annotation?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.parameterText == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.parameterText, ast, r.template, sink,
@@ -615,7 +615,7 @@ class _Renderer_Callable extends RendererBase<Callable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedName, ast, r.template, sink,
@@ -649,7 +649,7 @@ class _Renderer_Callable extends RendererBase<Callable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.returnType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ElementType(c.returnType, ast, r.template, sink,
@@ -662,7 +662,7 @@ class _Renderer_Callable extends RendererBase<Callable?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'FunctionType'),
-                  isNullValue: (CT_ c) => c.type == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.type, ast, r.template, sink,
@@ -721,7 +721,7 @@ class _Renderer_Canonicalization extends RendererBase<Canonicalization?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames,
                           'Map<String, ModelCommentReference>'),
-                  isNullValue: (CT_ c) => c.commentRefs == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
@@ -951,7 +951,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.canonicalLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.canonicalLibrary, ast, r.template, sink,
@@ -964,7 +964,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'CategoryDefinition'),
-                  isNullValue: (CT_ c) => c.categoryDefinition == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.categoryDefinition, ast, r.template, sink,
@@ -977,7 +977,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.categoryIndex == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.categoryIndex, ast, r.template, sink,
@@ -999,7 +999,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.categoryLabel == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.categoryLabel, ast, r.template, sink,
@@ -1024,7 +1024,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames,
                           'Map<String, ModelCommentReference>'),
-                  isNullValue: (CT_ c) => c.commentRefs == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
@@ -1037,7 +1037,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'DartdocOptionContext'),
-                  isNullValue: (CT_ c) => c.config == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
@@ -1101,7 +1101,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'DocumentLocation'),
-                  isNullValue: (CT_ c) => c.documentedWhere == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentedWhere, ast, r.template, sink,
@@ -1158,7 +1158,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.enclosingName, ast, r.template, sink,
@@ -1216,7 +1216,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -1238,7 +1238,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -1308,7 +1308,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -1329,7 +1329,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedName, ast, r.template, sink,
@@ -1363,7 +1363,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -1384,7 +1384,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -1397,7 +1397,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -1423,7 +1423,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -1459,7 +1459,7 @@ class _Renderer_Category extends RendererBase<Category?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sortKey == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sortKey, ast, r.template, sink, parent: r);
@@ -1531,7 +1531,7 @@ class _Renderer_CategoryTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.category == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Category(c.category, ast, r.template, sink,
@@ -1553,7 +1553,7 @@ class _Renderer_CategoryTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -1575,7 +1575,7 @@ class _Renderer_CategoryTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -1597,7 +1597,7 @@ class _Renderer_CategoryTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -1632,7 +1632,7 @@ class _Renderer_CategoryTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Category(c.self, ast, r.template, sink, parent: r);
@@ -1653,7 +1653,7 @@ class _Renderer_CategoryTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -1768,7 +1768,7 @@ class _Renderer_Class extends RendererBase<Class?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileName, ast, r.template, sink,
@@ -1790,7 +1790,7 @@ class _Renderer_Class extends RendererBase<Class?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -1812,7 +1812,7 @@ class _Renderer_Class extends RendererBase<Class?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullkind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullkind, ast, r.template, sink,
@@ -1901,7 +1901,7 @@ class _Renderer_Class extends RendererBase<Class?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -1967,7 +1967,7 @@ class _Renderer_ClassTemplateData extends RendererBase<ClassTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.clazz == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Class(c.clazz, ast, r.template, sink, parent: r);
@@ -2011,7 +2011,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.definingCommentReferable == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
@@ -2069,7 +2069,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -2106,7 +2106,7 @@ class _Renderer_CommentReferable extends RendererBase<CommentReferable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.referenceName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.referenceName, ast, r.template, sink,
@@ -2328,7 +2328,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingElement == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ModelElement(
@@ -2351,7 +2351,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -2373,7 +2373,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullKind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullKind, ast, r.template, sink,
@@ -2395,7 +2395,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -2445,7 +2445,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -2466,7 +2466,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Callable(c.modelType, ast, r.template, sink,
@@ -2488,7 +2488,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -2509,7 +2509,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nameWithGenerics == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.nameWithGenerics, ast, r.template, sink,
@@ -2522,7 +2522,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -2544,7 +2544,7 @@ class _Renderer_Constructor extends RendererBase<Constructor?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.referenceName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.referenceName, ast, r.template, sink,
@@ -2640,7 +2640,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.clazz == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Class(c.clazz, ast, r.template, sink, parent: r);
@@ -2661,7 +2661,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.constructor == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Constructor(c.constructor, ast, r.template, sink,
@@ -2683,7 +2683,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.container == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Container(c.container, ast, r.template, sink,
@@ -2705,7 +2705,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -2727,7 +2727,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -2749,7 +2749,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -2771,7 +2771,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -2818,7 +2818,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Constructor(c.self, ast, r.template, sink,
@@ -2840,7 +2840,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForContainer == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForContainer, ast, r.template, sink,
@@ -2862,7 +2862,7 @@ class _Renderer_ConstructorTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -3200,7 +3200,7 @@ class _Renderer_Container extends RendererBase<Container?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -3222,7 +3222,7 @@ class _Renderer_Container extends RendererBase<Container?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -3438,7 +3438,7 @@ class _Renderer_Container extends RendererBase<Container?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -3784,7 +3784,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.definingCommentReferable == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
@@ -3798,7 +3798,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'Element'),
-                  isNullValue: (CT_ c) => c.element == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
@@ -3820,7 +3820,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -3832,7 +3832,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'DartType'),
-                  isNullValue: (CT_ c) => c.instantiatedType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.instantiatedType, ast, r.template, sink,
@@ -3868,7 +3868,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelElement == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ModelElement(c.modelElement, ast, r.template, sink,
@@ -3890,7 +3890,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -3902,7 +3902,7 @@ class _Renderer_DefinedElementType extends RendererBase<DefinedElementType?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -3987,7 +3987,7 @@ class _Renderer_Documentable extends RendererBase<Documentable?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'DartdocOptionContext'),
-                  isNullValue: (CT_ c) => c.config == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
@@ -4096,7 +4096,7 @@ class _Renderer_Documentable extends RendererBase<Documentable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -4130,7 +4130,7 @@ class _Renderer_Documentable extends RendererBase<Documentable?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -4198,7 +4198,7 @@ class _Renderer_DocumentationComment
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentationComment == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -4248,7 +4248,7 @@ class _Renderer_DocumentationComment
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Documentation'),
-                  isNullValue: (CT_ c) => c.elementDocumentation == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.elementDocumentation, ast, r.template, sink,
@@ -4300,7 +4300,7 @@ class _Renderer_DocumentationComment
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'ModelElementRenderer'),
-                  isNullValue: (CT_ c) => c.modelElementRenderer == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelElementRenderer, ast, r.template, sink,
@@ -4320,7 +4320,7 @@ class _Renderer_DocumentationComment
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'Context'),
-                  isNullValue: (CT_ c) => c.pathContext == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.pathContext, ast, r.template, sink,
@@ -4394,7 +4394,7 @@ class _Renderer_ElementType extends RendererBase<ElementType?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'DartType'),
-                  isNullValue: (CT_ c) => c.instantiatedType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.instantiatedType, ast, r.template, sink,
@@ -4423,7 +4423,7 @@ class _Renderer_ElementType extends RendererBase<ElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -4445,7 +4445,7 @@ class _Renderer_ElementType extends RendererBase<ElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedName, ast, r.template, sink,
@@ -4467,7 +4467,7 @@ class _Renderer_ElementType extends RendererBase<ElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nameWithGenerics == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.nameWithGenerics, ast, r.template, sink,
@@ -4489,7 +4489,7 @@ class _Renderer_ElementType extends RendererBase<ElementType?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nullabilitySuffix == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.nullabilitySuffix, ast, r.template, sink,
@@ -4502,7 +4502,7 @@ class _Renderer_ElementType extends RendererBase<ElementType?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -4536,7 +4536,7 @@ class _Renderer_ElementType extends RendererBase<ElementType?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'DartType'),
-                  isNullValue: (CT_ c) => c.type == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.type, ast, r.template, sink,
@@ -4615,7 +4615,7 @@ class _Renderer_Enum extends RendererBase<Enum?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -4674,7 +4674,7 @@ class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData?> {
                             nextProperty,
                             [...remainingNames.skip(1)]);
                       },
-                      isNullValue: (CT_ c) => c.eNum == null,
+                      isNullValue: (CT_ c) => false,
                       renderValue: (CT_ c, RendererBase<CT_> r,
                           List<MustachioNode> ast, StringSink sink) {
                         _render_Enum(c.eNum, ast, r.template, sink, parent: r);
@@ -4695,7 +4695,7 @@ class _Renderer_EnumTemplateData extends RendererBase<EnumTemplateData?> {
                             nextProperty,
                             [...remainingNames.skip(1)]);
                       },
-                      isNullValue: (CT_ c) => c.self == null,
+                      isNullValue: (CT_ c) => false,
                       renderValue: (CT_ c, RendererBase<CT_> r,
                           List<MustachioNode> ast, StringSink sink) {
                         _render_Enum(c.self, ast, r.template, sink, parent: r);
@@ -4783,7 +4783,7 @@ class _Renderer_Extension extends RendererBase<Extension?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'ExtensionElement'),
-                  isNullValue: (CT_ c) => c.element == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
@@ -4829,7 +4829,7 @@ class _Renderer_Extension extends RendererBase<Extension?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.extendedType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ElementType(c.extendedType, ast, r.template, sink,
@@ -4851,7 +4851,7 @@ class _Renderer_Extension extends RendererBase<Extension?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -4873,7 +4873,7 @@ class _Renderer_Extension extends RendererBase<Extension?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -4894,7 +4894,7 @@ class _Renderer_Extension extends RendererBase<Extension?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -4906,7 +4906,7 @@ class _Renderer_Extension extends RendererBase<Extension?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -4979,7 +4979,7 @@ class _Renderer_ExtensionTarget extends RendererBase<ExtensionTarget?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ElementType(c.modelType, ast, r.template, sink,
@@ -5071,7 +5071,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.container == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Container(c.container, ast, r.template, sink,
@@ -5093,7 +5093,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.extension == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Extension(c.extension, ast, r.template, sink,
@@ -5115,7 +5115,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -5137,7 +5137,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -5159,7 +5159,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -5181,7 +5181,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -5216,7 +5216,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Extension(c.self, ast, r.template, sink, parent: r);
@@ -5237,7 +5237,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForContainer == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForContainer, ast, r.template, sink,
@@ -5259,7 +5259,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForLibrary, ast, r.template, sink,
@@ -5281,7 +5281,7 @@ class _Renderer_ExtensionTemplateData<T extends Extension>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -5325,7 +5325,7 @@ class _Renderer_Feature extends RendererBase<Feature?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.featurePrefix == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.featurePrefix, ast, r.template, sink,
@@ -5410,7 +5410,7 @@ class _Renderer_Feature extends RendererBase<Feature?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.sortGroup == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.sortGroup, ast, r.template, sink,
@@ -5494,7 +5494,7 @@ class _Renderer_FeatureSet extends RendererBase<FeatureSet?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -5549,7 +5549,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentation == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.documentation, ast, r.template, sink,
@@ -5571,7 +5571,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingElement == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Container(c.enclosingElement, ast, r.template, sink,
@@ -5619,7 +5619,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileName, ast, r.template, sink,
@@ -5641,7 +5641,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -5663,7 +5663,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullkind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullkind, ast, r.template, sink,
@@ -5763,7 +5763,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -5784,7 +5784,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -5828,7 +5828,7 @@ class _Renderer_Field extends RendererBase<Field?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -5933,7 +5933,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.function == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ModelFunction(c.function, ast, r.template, sink,
@@ -5955,7 +5955,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -5977,7 +5977,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -5999,7 +5999,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -6021,7 +6021,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -6056,7 +6056,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ModelFunction(c.self, ast, r.template, sink,
@@ -6078,7 +6078,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForLibrary, ast, r.template, sink,
@@ -6100,7 +6100,7 @@ class _Renderer_FunctionTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -6152,7 +6152,7 @@ class _Renderer_FunctionTypedef extends RendererBase<FunctionTypedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Callable(c.modelType, ast, r.template, sink,
@@ -6165,7 +6165,7 @@ class _Renderer_FunctionTypedef extends RendererBase<FunctionTypedef?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -6235,7 +6235,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.arrow == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.arrow, ast, r.template, sink, parent: r);
@@ -6283,7 +6283,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.constantValue == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.constantValue, ast, r.template, sink,
@@ -6305,7 +6305,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.constantValueBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.constantValueBase, ast, r.template, sink,
@@ -6327,7 +6327,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.constantValueTruncated == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -6350,7 +6350,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentationComment == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -6567,7 +6567,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ElementType(c.modelType, ast, r.template, sink,
@@ -6628,7 +6628,7 @@ class _Renderer_GetterSetterCombo extends RendererBase<GetterSetterCombo?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -6723,7 +6723,7 @@ class _Renderer_Indexable extends RendererBase<Indexable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -6837,7 +6837,7 @@ class _Renderer_Inheritable extends RendererBase<Inheritable?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.overriddenDepth == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.overriddenDepth, ast, r.template, sink,
@@ -6976,7 +6976,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.definingContainer == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_InheritingContainer(
@@ -7035,7 +7035,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -7057,7 +7057,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullkind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullkind, ast, r.template, sink,
@@ -7195,7 +7195,7 @@ class _Renderer_InheritingContainer extends RendererBase<InheritingContainer?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_DefinedElementType(
@@ -7379,7 +7379,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.clazz == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_InheritingContainer(c.clazz, ast, r.template, sink,
@@ -7401,7 +7401,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.container == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Container(c.container, ast, r.template, sink,
@@ -7423,7 +7423,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -7445,7 +7445,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -7467,7 +7467,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -7489,7 +7489,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedObjectType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedObjectType, ast, r.template, sink,
@@ -7511,7 +7511,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -7569,7 +7569,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_InheritingContainer(c.self, ast, r.template, sink,
@@ -7591,7 +7591,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForContainer == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForContainer, ast, r.template, sink,
@@ -7613,7 +7613,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForLibrary, ast, r.template, sink,
@@ -7635,7 +7635,7 @@ class _Renderer_InheritingContainerTemplateData<T extends InheritingContainer>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -7712,7 +7712,7 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.featureLabel == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.featureLabel, ast, r.template, sink,
@@ -7756,7 +7756,7 @@ class _Renderer_LanguageFeature extends RendererBase<LanguageFeature?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -7876,7 +7876,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'CompilationUnitElement'),
-                  isNullValue: (CT_ c) => c.compilationUnitElement == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
@@ -7913,7 +7913,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.dirName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.dirName, ast, r.template, sink, parent: r);
@@ -7925,7 +7925,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'LibraryElement'),
-                  isNullValue: (CT_ c) => c.element == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.element, ast, r.template, sink,
@@ -8007,7 +8007,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileName, ast, r.template, sink,
@@ -8029,7 +8029,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -8127,7 +8127,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -8148,7 +8148,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -8173,7 +8173,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames,
                           'HashMap<Element, Set<ModelElement>>'),
-                  isNullValue: (CT_ c) => c.modelElementsMap == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelElementsMap, ast, r.template, sink,
@@ -8195,7 +8195,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -8216,7 +8216,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nameFromPath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.nameFromPath, ast, r.template, sink,
@@ -8238,7 +8238,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -8273,7 +8273,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.packageName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.packageName, ast, r.template, sink,
@@ -8286,7 +8286,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, Set<Library>>'),
-                  isNullValue: (CT_ c) => c.prefixToLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.prefixToLibrary, ast, r.template, sink,
@@ -8312,7 +8312,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -8338,7 +8338,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'Scope'),
-                  isNullValue: (CT_ c) => c.scope == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.scope, ast, r.template, sink,
@@ -8364,7 +8364,7 @@ class _Renderer_Library extends RendererBase<Library?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'TypeSystem'),
-                  isNullValue: (CT_ c) => c.typeSystem == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.typeSystem, ast, r.template, sink,
@@ -8441,7 +8441,7 @@ class _Renderer_LibraryContainer extends RendererBase<LibraryContainer?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.enclosingName, ast, r.template, sink,
@@ -8480,7 +8480,7 @@ class _Renderer_LibraryContainer extends RendererBase<LibraryContainer?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -8584,7 +8584,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -8606,7 +8606,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -8628,7 +8628,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -8650,7 +8650,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -8685,7 +8685,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.self, ast, r.template, sink, parent: r);
@@ -8706,7 +8706,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForLibrary, ast, r.template, sink,
@@ -8728,7 +8728,7 @@ class _Renderer_LibraryTemplateData extends RendererBase<LibraryTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -8792,7 +8792,7 @@ class _Renderer_Locatable extends RendererBase<Locatable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -8835,7 +8835,7 @@ class _Renderer_Locatable extends RendererBase<Locatable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.location == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.location, ast, r.template, sink,
@@ -8881,7 +8881,7 @@ class _Renderer_MarkdownFileDocumentation
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentation == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.documentation, ast, r.template, sink,
@@ -8928,7 +8928,7 @@ class _Renderer_MarkdownFileDocumentation
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'DocumentLocation'),
-                  isNullValue: (CT_ c) => c.documentedWhere == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentedWhere, ast, r.template, sink,
@@ -8972,7 +8972,7 @@ class _Renderer_MarkdownFileDocumentation
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.location == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.location, ast, r.template, sink,
@@ -9125,7 +9125,7 @@ class _Renderer_Method extends RendererBase<Method?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -9147,7 +9147,7 @@ class _Renderer_Method extends RendererBase<Method?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullkind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullkind, ast, r.template, sink,
@@ -9218,7 +9218,7 @@ class _Renderer_Method extends RendererBase<Method?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -9239,7 +9239,7 @@ class _Renderer_Method extends RendererBase<Method?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Callable(c.modelType, ast, r.template, sink,
@@ -9288,7 +9288,7 @@ class _Renderer_Method extends RendererBase<Method?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -9360,7 +9360,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.container == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Container(c.container, ast, r.template, sink,
@@ -9382,7 +9382,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -9404,7 +9404,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -9426,7 +9426,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -9448,7 +9448,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -9470,7 +9470,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.method == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Method(c.method, ast, r.template, sink, parent: r);
@@ -9516,7 +9516,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Method(c.self, ast, r.template, sink, parent: r);
@@ -9537,7 +9537,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForContainer == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForContainer, ast, r.template, sink,
@@ -9559,7 +9559,7 @@ class _Renderer_MethodTemplateData extends RendererBase<MethodTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -9673,7 +9673,7 @@ class _Renderer_Mixin extends RendererBase<Mixin?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileName, ast, r.template, sink,
@@ -9722,7 +9722,7 @@ class _Renderer_Mixin extends RendererBase<Mixin?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -9808,7 +9808,7 @@ class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.mixin == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Mixin(c.mixin, ast, r.template, sink, parent: r);
@@ -9829,7 +9829,7 @@ class _Renderer_MixinTemplateData extends RendererBase<MixinTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Mixin(c.self, ast, r.template, sink, parent: r);
@@ -9863,7 +9863,7 @@ class _Renderer_ModelBuilder extends RendererBase<ModelBuilder?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'ModelObjectBuilder'),
-                  isNullValue: (CT_ c) => c.modelBuilder == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.modelBuilder, ast, r.template, sink,
@@ -9877,7 +9877,7 @@ class _Renderer_ModelBuilder extends RendererBase<ModelBuilder?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -10015,7 +10015,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames,
                           'Map<String, ModelCommentReference>'),
-                  isNullValue: (CT_ c) => c.commentRefs == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
@@ -10043,7 +10043,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'DartdocOptionContext'),
-                  isNullValue: (CT_ c) => c.config == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
@@ -10066,7 +10066,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.definingCommentReferable == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
@@ -10090,7 +10090,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.definingLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.definingLibrary, ast, r.template, sink,
@@ -10124,7 +10124,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentation == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.documentation, ast, r.template, sink,
@@ -10146,7 +10146,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentationComment == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -10194,7 +10194,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.extendedDocLink == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.extendedDocLink, ast, r.template, sink,
@@ -10229,7 +10229,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.featuresAsString == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.featuresAsString, ast, r.template, sink,
@@ -10251,7 +10251,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileName, ast, r.template, sink,
@@ -10295,7 +10295,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileType, ast, r.template, sink,
@@ -10317,7 +10317,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -10566,7 +10566,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -10609,7 +10609,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedName, ast, r.template, sink,
@@ -10631,7 +10631,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedParams == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedParams, ast, r.template, sink,
@@ -10653,7 +10653,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedParamsLines == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedParamsLines, ast, r.template, sink,
@@ -10698,8 +10698,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) =>
-                      c.linkedParamsNoMetadataOrNames == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -10722,7 +10721,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.location == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.location, ast, r.template, sink,
@@ -10768,7 +10767,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -10836,7 +10835,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -10860,7 +10859,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'Context'),
-                  isNullValue: (CT_ c) => c.pathContext == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.pathContext, ast, r.template, sink,
@@ -10904,7 +10903,7 @@ class _Renderer_ModelElement extends RendererBase<ModelElement?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sourceFileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sourceFileName, ast, r.template, sink,
@@ -11000,7 +10999,7 @@ class _Renderer_ModelFunction extends RendererBase<ModelFunction?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -11090,7 +11089,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -11140,7 +11139,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -11161,7 +11160,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Callable(c.modelType, ast, r.template, sink,
@@ -11183,7 +11182,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -11196,7 +11195,7 @@ class _Renderer_ModelFunctionTyped extends RendererBase<ModelFunctionTyped?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -11268,7 +11267,7 @@ class _Renderer_Nameable extends RendererBase<Nameable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -11290,7 +11289,7 @@ class _Renderer_Nameable extends RendererBase<Nameable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -11358,7 +11357,7 @@ class _Renderer_Object extends RendererBase<Object?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.hashCode == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
@@ -11410,7 +11409,7 @@ class _Renderer_Operator extends RendererBase<Operator?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileName, ast, r.template, sink,
@@ -11432,7 +11431,7 @@ class _Renderer_Operator extends RendererBase<Operator?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -11461,7 +11460,7 @@ class _Renderer_Operator extends RendererBase<Operator?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -11482,7 +11481,7 @@ class _Renderer_Operator extends RendererBase<Operator?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.referenceName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.referenceName, ast, r.template, sink,
@@ -11611,7 +11610,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames,
                           'Map<String, ModelCommentReference>'),
-                  isNullValue: (CT_ c) => c.commentRefs == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.commentRefs, ast, r.template, sink,
@@ -11624,7 +11623,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'DartdocOptionContext'),
-                  isNullValue: (CT_ c) => c.config == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.config, ast, r.template, sink,
@@ -11766,7 +11765,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'DocumentLocation'),
-                  isNullValue: (CT_ c) => c.documentedWhere == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.documentedWhere, ast, r.template, sink,
@@ -11823,7 +11822,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.enclosingName, ast, r.template, sink,
@@ -11845,7 +11844,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -11867,7 +11866,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileType, ast, r.template, sink,
@@ -11889,7 +11888,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fullyQualifiedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fullyQualifiedName, ast, r.template, sink,
@@ -11946,7 +11945,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.homepage == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.homepage, ast, r.template, sink,
@@ -11968,7 +11967,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.href == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.href, ast, r.template, sink, parent: r);
@@ -12031,7 +12030,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -12052,7 +12051,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.location == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.location, ast, r.template, sink,
@@ -12086,7 +12085,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -12098,7 +12097,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, Category>'),
-                  isNullValue: (CT_ c) => c.nameToCategory == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.nameToCategory, ast, r.template, sink,
@@ -12120,7 +12119,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.oneLineDoc == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.oneLineDoc, ast, r.template, sink,
@@ -12142,7 +12141,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -12155,7 +12154,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageGraph'),
-                  isNullValue: (CT_ c) => c.packageGraph == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageGraph, ast, r.template, sink,
@@ -12168,7 +12167,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'PackageMeta'),
-                  isNullValue: (CT_ c) => c.packageMeta == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.packageMeta, ast, r.template, sink,
@@ -12215,7 +12214,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -12237,7 +12236,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.referenceName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.referenceName, ast, r.template, sink,
@@ -12263,7 +12262,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.toolInvocationIndex == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.toolInvocationIndex, ast, r.template, sink,
@@ -12276,7 +12275,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, Set<String>>'),
-                  isNullValue: (CT_ c) => c.usedAnimationIdsByHref == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(
@@ -12299,7 +12298,7 @@ class _Renderer_Package extends RendererBase<Package?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.version == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.version, ast, r.template, sink, parent: r);
@@ -12364,7 +12363,7 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.homepage == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.homepage, ast, r.template, sink,
@@ -12386,7 +12385,7 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -12415,7 +12414,7 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -12437,7 +12436,7 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -12472,7 +12471,7 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -12494,7 +12493,7 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.self, ast, r.template, sink, parent: r);
@@ -12515,7 +12514,7 @@ class _Renderer_PackageTemplateData extends RendererBase<PackageTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -12608,7 +12607,7 @@ class _Renderer_Parameter extends RendererBase<Parameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingElement == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ModelElement(
@@ -12631,7 +12630,7 @@ class _Renderer_Parameter extends RendererBase<Parameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -12650,7 +12649,7 @@ class _Renderer_Parameter extends RendererBase<Parameter?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.hashCode == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
@@ -12693,7 +12692,7 @@ class _Renderer_Parameter extends RendererBase<Parameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlId == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlId, ast, r.template, sink, parent: r);
@@ -12749,7 +12748,7 @@ class _Renderer_Parameter extends RendererBase<Parameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -12770,7 +12769,7 @@ class _Renderer_Parameter extends RendererBase<Parameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ElementType(c.modelType, ast, r.template, sink,
@@ -12797,7 +12796,7 @@ class _Renderer_Parameter extends RendererBase<Parameter?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -12858,7 +12857,7 @@ class _Renderer_ParameterizedElementType
                               List<String> remainingNames) =>
                           self.renderSimpleVariable(
                               c, remainingNames, 'ParameterizedType'),
-                      isNullValue: (CT_ c) => c.type == null,
+                      isNullValue: (CT_ c) => false,
                       renderValue: (CT_ c, RendererBase<CT_> r,
                           List<MustachioNode> ast, StringSink sink) {
                         renderSimple(c.type, ast, r.template, sink,
@@ -12963,7 +12962,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.container == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Container(c.container, ast, r.template, sink,
@@ -12985,7 +12984,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -13007,7 +13006,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -13029,7 +13028,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -13051,7 +13050,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -13098,7 +13097,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.property == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Field(c.property, ast, r.template, sink, parent: r);
@@ -13119,7 +13118,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Field(c.self, ast, r.template, sink, parent: r);
@@ -13140,7 +13139,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForContainer == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForContainer, ast, r.template, sink,
@@ -13162,7 +13161,7 @@ class _Renderer_PropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -13205,7 +13204,7 @@ class _Renderer_Rendered extends RendererBase<Rendered?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedName, ast, r.template, sink,
@@ -13227,7 +13226,7 @@ class _Renderer_Rendered extends RendererBase<Rendered?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nameWithGenerics == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.nameWithGenerics, ast, r.template, sink,
@@ -13394,7 +13393,7 @@ class _Renderer_String extends RendererBase<String?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.hashCode == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
@@ -13420,7 +13419,7 @@ class _Renderer_String extends RendererBase<String?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.length == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.length, ast, r.template, sink,
@@ -13479,7 +13478,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.bareHref == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.bareHref, ast, r.template, sink,
@@ -13501,7 +13500,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.customFooter == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.customFooter, ast, r.template, sink,
@@ -13523,7 +13522,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.customHeader == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.customHeader, ast, r.template, sink,
@@ -13545,7 +13544,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.customInnerFooter == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.customInnerFooter, ast, r.template, sink,
@@ -13567,7 +13566,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.defaultPackage == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.defaultPackage, ast, r.template, sink,
@@ -13625,7 +13624,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -13638,7 +13637,7 @@ class _Renderer_TemplateData<T extends Documentable>
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'TemplateOptions'),
-                  isNullValue: (CT_ c) => c.htmlOptions == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.htmlOptions, ast, r.template, sink,
@@ -13668,7 +13667,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -13702,7 +13701,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -13793,7 +13792,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Documentable(c.self, ast, r.template, sink,
@@ -13815,7 +13814,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -13843,7 +13842,7 @@ class _Renderer_TemplateData<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.version == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.version, ast, r.template, sink, parent: r);
@@ -13907,7 +13906,7 @@ class _Renderer_TemplateDataWithContainer<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.container == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Container(c.container, ast, r.template, sink,
@@ -13972,7 +13971,7 @@ class _Renderer_TemplateDataWithLibrary<T extends Documentable>
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -14454,7 +14453,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -14476,7 +14475,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -14498,7 +14497,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -14520,7 +14519,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -14555,7 +14554,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.property == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_TopLevelVariable(c.property, ast, r.template, sink,
@@ -14577,7 +14576,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_TopLevelVariable(c.self, ast, r.template, sink,
@@ -14599,7 +14598,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForLibrary, ast, r.template, sink,
@@ -14621,7 +14620,7 @@ class _Renderer_TopLevelPropertyTemplateData
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -14675,7 +14674,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.documentation == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.documentation, ast, r.template, sink,
@@ -14733,7 +14732,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.fileName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.fileName, ast, r.template, sink,
@@ -14755,7 +14754,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -14848,7 +14847,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -14869,7 +14868,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -14891,7 +14890,7 @@ class _Renderer_TopLevelVariable extends RendererBase<TopLevelVariable?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -15124,7 +15123,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.enclosingElement == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ModelElement(
@@ -15147,7 +15146,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -15197,7 +15196,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -15218,7 +15217,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.linkedName, ast, r.template, sink,
@@ -15240,7 +15239,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.name == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.name, ast, r.template, sink, parent: r);
@@ -15252,7 +15251,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -15274,7 +15273,7 @@ class _Renderer_TypeParameter extends RendererBase<TypeParameter?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.referenceName == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.referenceName, ast, r.template, sink,
@@ -15332,7 +15331,7 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.genericParameters == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.genericParameters, ast, r.template, sink,
@@ -15361,7 +15360,7 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedGenericParameters == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -15384,7 +15383,7 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nameWithGenerics == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.nameWithGenerics, ast, r.template, sink,
@@ -15406,7 +15405,7 @@ class _Renderer_TypeParameters extends RendererBase<TypeParameters?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nameWithLinkedGenerics == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -15464,7 +15463,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'DartType'),
-                  isNullValue: (CT_ c) => c.aliasedType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.aliasedType, ast, r.template, sink,
@@ -15486,7 +15485,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.asCallable == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_FunctionTypedef(c.asCallable, ast, r.template, sink,
@@ -15544,7 +15543,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.filePath == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.filePath, ast, r.template, sink,
@@ -15566,7 +15565,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.genericParameters == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.genericParameters, ast, r.template, sink,
@@ -15616,7 +15615,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.kind == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.kind, ast, r.template, sink, parent: r);
@@ -15637,7 +15636,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -15659,7 +15658,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.linkedGenericParameters == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(
@@ -15682,7 +15681,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.modelType == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_ElementType(c.modelType, ast, r.template, sink,
@@ -15704,7 +15703,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.nameWithGenerics == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.nameWithGenerics, ast, r.template, sink,
@@ -15726,7 +15725,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.package == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Package(c.package, ast, r.template, sink,
@@ -15739,7 +15738,7 @@ class _Renderer_Typedef extends RendererBase<Typedef?> {
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(
                           c, remainingNames, 'Map<String, CommentReferable>'),
-                  isNullValue: (CT_ c) => c.referenceChildren == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.referenceChildren, ast, r.template, sink,
@@ -15825,7 +15824,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.htmlBase == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.htmlBase, ast, r.template, sink,
@@ -15847,7 +15846,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.layoutTitle == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.layoutTitle, ast, r.template, sink,
@@ -15869,7 +15868,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.library == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Library(c.library, ast, r.template, sink,
@@ -15891,7 +15890,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.metaDescription == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.metaDescription, ast, r.template, sink,
@@ -15926,7 +15925,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.self == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Typedef(c.self, ast, r.template, sink, parent: r);
@@ -15947,7 +15946,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.sidebarForLibrary == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.sidebarForLibrary, ast, r.template, sink,
@@ -15969,7 +15968,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.title == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_String(c.title, ast, r.template, sink, parent: r);
@@ -15990,7 +15989,7 @@ class _Renderer_TypedefTemplateData extends RendererBase<TypedefTemplateData?> {
                         nextProperty,
                         [...remainingNames.skip(1)]);
                   },
-                  isNullValue: (CT_ c) => c.typeDef == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     _render_Typedef(c.typeDef, ast, r.template, sink,
diff --git a/lib/src/mustachio/renderer_base.dart b/lib/src/mustachio/renderer_base.dart
index ba5cc504d9..89dfa2ca1d 100644
--- a/lib/src/mustachio/renderer_base.dart
+++ b/lib/src/mustachio/renderer_base.dart
@@ -288,8 +288,8 @@ abstract class RendererBase<T extends Object?> {
   }
 }
 
-String renderSimple(
-    Object? context, List<MustachioNode> ast, Template template, StringSink sink,
+String renderSimple(Object? context, List<MustachioNode> ast, Template template,
+    StringSink sink,
     {required RendererBase<Object> parent, required Set<String> getters}) {
   var renderer = SimpleRenderer(context, parent, template, sink, getters);
   renderer.renderBlock(ast);
diff --git a/test/mustachio/foo.runtime_renderers.dart b/test/mustachio/foo.runtime_renderers.dart
index 77d48e1b45..13b392d97d 100644
--- a/test/mustachio/foo.runtime_renderers.dart
+++ b/test/mustachio/foo.runtime_renderers.dart
@@ -265,7 +265,7 @@ class Renderer_Foo extends RendererBase<Foo?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'String'),
-                  isNullValue: (CT_ c) => c.s1 == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.s1, ast, r.template, sink,
@@ -311,6 +311,12 @@ class Renderer_FooBase<T extends Object> extends RendererBase<FooBase<T>?> {
                             nextProperty,
                             [...remainingNames.skip(1)]);
                       },
+                      isNullValue: (CT_ c) => false,
+                      renderValue: (CT_ c, RendererBase<CT_> r,
+                          List<MustachioNode> ast, StringSink sink) {
+                        renderSimple(c.baz, ast, r.template, sink,
+                            parent: r, getters: _invisibleGetters['Object']!);
+                      },
                     ),
                   }) as Map<String, Property<CT_>>;
 
@@ -382,25 +388,13 @@ class Renderer_Object extends RendererBase<Object?> {
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'int'),
-                  isNullValue: (CT_ c) => c.hashCode == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.hashCode, ast, r.template, sink,
                         parent: r, getters: _invisibleGetters['int']!);
                   },
                 ),
-                'runtimeType': Property(
-                  getValue: (CT_ c) => c.runtimeType,
-                  renderVariable: (CT_ c, Property<CT_> self,
-                          List<String> remainingNames) =>
-                      self.renderSimpleVariable(c, remainingNames, 'Type'),
-                  isNullValue: (CT_ c) => c.runtimeType == null,
-                  renderValue: (CT_ c, RendererBase<CT_> r,
-                      List<MustachioNode> ast, StringSink sink) {
-                    renderSimple(c.runtimeType, ast, r.template, sink,
-                        parent: r, getters: _invisibleGetters['Type']!);
-                  },
-                ),
               }) as Map<String, Property<CT_>>;
 
   Renderer_Object(Object? context, RendererBase<Object>? parent,
@@ -554,6 +548,7 @@ class Renderer_Property3 extends RendererBase<Property3?> {
 }
 
 const _invisibleGetters = {
+  'Object': {'hashCode', 'runtimeType'},
   'String': {
     'hashCode',
     'runtimeType',
@@ -563,7 +558,6 @@ const _invisibleGetters = {
     'codeUnits',
     'runes'
   },
-  'Type': {'hashCode', 'runtimeType'},
   'int': {
     'hashCode',
     'runtimeType',
diff --git a/test/mustachio/runtime_renderer_builder_test.dart b/test/mustachio/runtime_renderer_builder_test.dart
index 7aee3c78f4..704a944386 100644
--- a/test/mustachio/runtime_renderer_builder_test.dart
+++ b/test/mustachio/runtime_renderer_builder_test.dart
@@ -139,14 +139,16 @@ class Baz {}
 '''));
     });
 
-    test('with a property map with a non-bool, non-Iterable property', () {
+    test(
+        'with a property map with a non-bool, non-Iterable, non-nullable property',
+        () {
       expect(generatedContent, contains('''
                 's1': Property(
                   getValue: (CT_ c) => c.s1,
                   renderVariable: (CT_ c, Property<CT_> self,
                           List<String> remainingNames) =>
                       self.renderSimpleVariable(c, remainingNames, 'String'),
-                  isNullValue: (CT_ c) => c.s1 == null,
+                  isNullValue: (CT_ c) => false,
                   renderValue: (CT_ c, RendererBase<CT_> r,
                       List<MustachioNode> ast, StringSink sink) {
                     renderSimple(c.s1, ast, r.template, sink,
@@ -207,7 +209,8 @@ import 'package:mustachio/annotations.dart';
     test('with a corresponding render function', () async {
       expect(
           generatedContent,
-          contains('void _render_Foo<T>(Foo<T>? context, List<MustachioNode> ast, Template template,\n'
+          contains(
+              'void _render_Foo<T>(Foo<T>? context, List<MustachioNode> ast, Template template,\n'
               '    StringSink sink,\n'));
     });
 
diff --git a/test/mustachio/runtime_renderer_render_test.dart b/test/mustachio/runtime_renderer_render_test.dart
index 6648619b79..e200979b3d 100644
--- a/test/mustachio/runtime_renderer_render_test.dart
+++ b/test/mustachio/runtime_renderer_render_test.dart
@@ -27,7 +27,7 @@ void main() {
 
   test('property map contains all public getters', () {
     var propertyMap = Renderer_Foo.propertyMap();
-    expect(propertyMap.keys, hasLength(8));
+    expect(propertyMap.keys, hasLength(7));
     expect(propertyMap['b1'], isNotNull);
     expect(propertyMap['s1'], isNotNull);
     expect(propertyMap['l1'], isNotNull);
@@ -35,7 +35,6 @@ void main() {
     expect(propertyMap['p1'], isNotNull);
     expect(propertyMap['length'], isNotNull);
     expect(propertyMap['hashCode'], isNotNull);
-    expect(propertyMap['runtimeType'], isNotNull);
   });
 
   test('property map contains valid bool Properties', () {
@@ -82,8 +81,8 @@ void main() {
 
   test('isNullValue returns true when a value is null', () {
     var propertyMap = Renderer_Foo.propertyMap();
-    var foo = Foo()..s1 = null;
-    expect(propertyMap['s1'].isNullValue(foo), isTrue);
+    var foo = Foo()..length = null;
+    expect(propertyMap['length'].isNullValue(foo), isTrue);
   });
 
   test('isNullValue returns false when a value is not null', () {
@@ -226,9 +225,9 @@ void main() {
 
   test('Renderer renders a null value section node as blank', () async {
     var fooTemplateFile = getFile('/project/foo.mustache')
-      ..writeAsStringSync('Text {{#s1}}"{{.}}" ({{length}}){{/s1}}');
+      ..writeAsStringSync('Text {{#length}}"{{.}}" ({{length}}){{/length}}');
     var fooTemplate = await Template.parse(fooTemplateFile);
-    var foo = Foo()..s1 = null;
+    var foo = Foo()..length = null;
     expect(renderFoo(foo, fooTemplate), equals('Text '));
   });
 
@@ -242,9 +241,9 @@ void main() {
 
   test('Renderer renders an inverted null value section node', () async {
     var fooTemplateFile = getFile('/project/foo.mustache')
-      ..writeAsStringSync('Text {{^s1}}Section{{/s1}}');
+      ..writeAsStringSync('Text {{^length}}Section{{/length}}');
     var fooTemplate = await Template.parse(fooTemplateFile);
-    var foo = Foo()..s1 = null;
+    var foo = Foo()..length = null;
     expect(renderFoo(foo, fooTemplate), equals('Text Section'));
   });
 
diff --git a/tool/mustachio/codegen_runtime_renderer.dart b/tool/mustachio/codegen_runtime_renderer.dart
index 513e9763ac..417efe3dfb 100644
--- a/tool/mustachio/codegen_runtime_renderer.dart
+++ b/tool/mustachio/codegen_runtime_renderer.dart
@@ -337,7 +337,8 @@ import '${p.basename(_sourceUri.path)}';
   void _buildRenderer(_RendererInfo renderer,
       {required bool buildOnlyPublicFunction}) {
     var typeName = renderer._typeName;
-    var typeWithVariablesNullable = '$typeName${renderer._typeVariablesString}?';
+    var typeWithVariablesNullable =
+        '$typeName${renderer._typeVariablesString}?';
     var typeWithVariables = '$typeName${renderer._typeVariablesString}';
 
     if (renderer.publicApiFunctionName != null) {
@@ -379,7 +380,8 @@ class ${renderer._rendererClassName}${renderer._typeParametersString}
         Template template, StringSink sink)
       : super(context, parent, template, sink);
 ''');
-    var propertyMapTypeArguments = renderer._typeArgumentsStringWith(typeWithVariables);
+    var propertyMapTypeArguments =
+        renderer._typeArgumentsStringWith(typeWithVariables);
     var propertyMapName = 'propertyMap$propertyMapTypeArguments';
     // Write out `getProperty`.
     _buffer.writeln('''
@@ -561,8 +563,12 @@ renderIterable:
           renderCall =
               '$renderFunctionName(c.$getterName, ast, r.template, sink, parent: r)';
         }
+        var nullValueGetter =
+            getterType.nullabilitySuffix == NullabilitySuffix.none
+                ? 'false'
+                : 'c.$getterName == null';
         _buffer.writeln('''
-isNullValue: ($_contextTypeVariable c) => c.$getterName == null,
+isNullValue: ($_contextTypeVariable c) => $nullValueGetter,
 
 renderValue:
     ($_contextTypeVariable c, RendererBase<$_contextTypeVariable> r,
@@ -662,7 +668,8 @@ class _RendererInfo {
 
   String _renderSingleType(DartType tp) {
     var displayString = tp.getDisplayString(withNullability: false);
-    var nullabilitySuffix = tp.nullabilitySuffix == NullabilitySuffix.question ? '?' : '';
+    var nullabilitySuffix =
+        tp.nullabilitySuffix == NullabilitySuffix.question ? '?' : '';
     return '$displayString$nullabilitySuffix';
   }
 

From 2b392d605a211927d6e23db9d56fb87c68c24b3d Mon Sep 17 00:00:00 2001
From: Janice Collins <jcollins@google.com>
Date: Wed, 27 Oct 2021 14:05:23 -0700
Subject: [PATCH 3/5] Get runtime_renderer_render_test ready for NNBD strong
 mode, fix a few more problems

---
 lib/src/mustachio/renderer_base.dart          | 12 ++--
 .../runtime_renderer_render_test.dart         | 62 +++++++++++--------
 2 files changed, 41 insertions(+), 33 deletions(-)

diff --git a/lib/src/mustachio/renderer_base.dart b/lib/src/mustachio/renderer_base.dart
index 89dfa2ca1d..72b97d41f9 100644
--- a/lib/src/mustachio/renderer_base.dart
+++ b/lib/src/mustachio/renderer_base.dart
@@ -269,10 +269,9 @@ abstract class RendererBase<T extends Object?> {
 
     // If this section is not a conditional or repeated section, it is a value
     // section, regardless of type.
-    var isNullValue = property.isNullValue!;
-    if (node.invert && isNullValue(context)) {
+    if (node.invert && property.isNullValue(context)) {
       renderBlock(node.children);
-    } else if (!node.invert && !isNullValue(context)) {
+    } else if (!node.invert && !property.isNullValue(context)) {
       property.renderValue!(context, this, node.children, sink);
     }
   }
@@ -356,7 +355,7 @@ class Property<T> {
   final Iterable<void> Function(
       T, RendererBase<T>, List<MustachioNode>, StringSink)? renderIterable;
 
-  final bool Function(T)? isNullValue;
+  final bool Function(T) isNullValue;
 
   final void Function(T, RendererBase<T>, List<MustachioNode>, StringSink)?
       renderValue;
@@ -366,8 +365,9 @@ class Property<T> {
       required this.renderVariable,
       this.getBool,
       this.renderIterable,
-      this.isNullValue,
-      this.renderValue});
+      bool Function(T)? isNullValue,
+      this.renderValue})
+      : isNullValue = (isNullValue ?? (_) => false);
 
   String renderSimpleVariable(
       T c, List<String> remainingNames, String typeString) {
diff --git a/test/mustachio/runtime_renderer_render_test.dart b/test/mustachio/runtime_renderer_render_test.dart
index e200979b3d..07a3439aa7 100644
--- a/test/mustachio/runtime_renderer_render_test.dart
+++ b/test/mustachio/runtime_renderer_render_test.dart
@@ -3,7 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // @dart=2.9
-
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:dartdoc/src/mustachio/renderer_base.dart';
@@ -39,62 +38,71 @@ void main() {
 
   test('property map contains valid bool Properties', () {
     var propertyMap = Renderer_Foo.propertyMap();
-    expect(propertyMap['b1'].getValue, isNotNull);
-    expect(propertyMap['b1'].renderVariable, isNotNull);
-    expect(propertyMap['b1'].getBool, isNotNull);
-    expect(propertyMap['b1'].renderIterable, isNull);
-    expect(propertyMap['b1'].isNullValue, isNull);
-    expect(propertyMap['b1'].renderValue, isNull);
+    var b1 = propertyMap['b1'] /*!*/;
+    expect(b1.getValue, isNotNull);
+    expect(b1.renderVariable, isNotNull);
+    expect(b1.getBool, isNotNull);
+    expect(b1.renderIterable, isNull);
+    expect(b1.isNullValue, isNotNull);
+    expect(b1.renderValue, isNull);
   });
 
   test('property map contains valid Iterable Properties', () {
     var propertyMap = Renderer_Foo.propertyMap();
-    expect(propertyMap['l1'].getValue, isNotNull);
-    expect(propertyMap['l1'].renderVariable, isNotNull);
-    expect(propertyMap['l1'].getBool, isNull);
-    expect(propertyMap['l1'].renderIterable, isNotNull);
-    expect(propertyMap['l1'].isNullValue, isNull);
-    expect(propertyMap['l1'].renderValue, isNull);
+    var l1 = propertyMap['l1'] /*!*/;
+    expect(l1.getValue, isNotNull);
+    expect(l1.renderVariable, isNotNull);
+    expect(l1.getBool, isNull);
+    expect(l1.renderIterable, isNotNull);
+    expect(l1.isNullValue, isNotNull);
+    expect(l1.renderValue, isNull);
   });
 
   test('property map contains valid non-bool, non-Iterable Properties', () {
     var propertyMap = Renderer_Foo.propertyMap();
-    expect(propertyMap['s1'].getValue, isNotNull);
-    expect(propertyMap['s1'].renderVariable, isNotNull);
-    expect(propertyMap['s1'].getBool, isNull);
-    expect(propertyMap['s1'].renderIterable, isNull);
-    expect(propertyMap['s1'].isNullValue, isNotNull);
-    expect(propertyMap['s1'].renderValue, isNotNull);
+    var s1 = propertyMap['s1'] /*!*/;
+    expect(s1.getValue, isNotNull);
+    expect(s1.renderVariable, isNotNull);
+    expect(s1.getBool, isNull);
+    expect(s1.renderIterable, isNull);
+    expect(s1.isNullValue, isNotNull);
+    expect(s1.renderValue, isNotNull);
   });
 
   test('Property returns a field value by name', () {
     var propertyMap = Renderer_Foo.propertyMap();
     var foo = Foo()..s1 = 'hello';
-    expect(propertyMap['s1'].getValue(foo), equals('hello'));
+    expect(propertyMap['s1'] /*!*/ .getValue(foo), equals('hello'));
   });
 
   test('Property returns a bool field value by name', () {
     var propertyMap = Renderer_Foo.propertyMap();
     var foo = Foo()..b1 = true;
-    expect(propertyMap['b1'].getBool(foo), isTrue);
+    expect(propertyMap['b1'] /*!*/ .getBool /*!*/ (foo), isTrue);
   });
 
   test('isNullValue returns true when a value is null', () {
     var propertyMap = Renderer_Foo.propertyMap();
     var foo = Foo()..length = null;
-    expect(propertyMap['length'].isNullValue(foo), isTrue);
+    expect(propertyMap['length'] /*!*/ .isNullValue(foo), isTrue);
   });
 
   test('isNullValue returns false when a value is not null', () {
     var propertyMap = Renderer_Foo.propertyMap();
     var foo = Foo()..s1 = 'hello';
-    expect(propertyMap['s1'].isNullValue(foo), isFalse);
+    expect(propertyMap['s1'] /*!*/ .isNullValue(foo), isFalse);
   });
 
-  test('Property returns false for a null bool field value', () {
+  test('isNullValue returns false for a non-nullable field', () {
     var propertyMap = Renderer_Foo.propertyMap();
-    var foo = Foo()..b1 = null;
-    expect(propertyMap['b1'].getBool(foo), isFalse);
+    var foo = Foo()..b1 = true;
+    expect(propertyMap['b1'] /*!*/ .isNullValue(foo), isFalse);
+  });
+
+  test('Property returns false for a null bool field value', () {
+    var propertyMap = Renderer_Bar.propertyMap();
+    var bar = Bar()..l1 = null;
+    expect(propertyMap['l1'] /*!*/ .getBool /*!*/ (bar), isFalse);
   });
 
   test('Renderer renders a non-bool variable node, escaped', () async {
@@ -318,7 +326,7 @@ void main() {
       ..writeAsStringSync('Text {{#bar}}{{bar.foo.baz.bar.foo.s1}}{{/bar}}');
     var baz = Baz()..bar = (Bar()..foo = (Foo()..s1 = 'hello'));
     var bazTemplate = await Template.parse(bazTemplateFile);
-    baz.bar.foo.baz = baz;
+    baz.bar /*!*/ .foo /*!*/ .baz = baz;
     expect(renderBaz(baz, bazTemplate), equals('Text hello'));
   });
 

From d4e9a7461cef56d8ca6d82ed4e889dddc1326378 Mon Sep 17 00:00:00 2001
From: Janice Collins <jcollins@google.com>
Date: Wed, 27 Oct 2021 14:15:57 -0700
Subject: [PATCH 4/5] deconfuse github


From 56ffe05cf01fc8415c24d74969c1f2ef457d8b26 Mon Sep 17 00:00:00 2001
From: Janice Collins <jcollins@google.com>
Date: Thu, 28 Oct 2021 10:20:15 -0700
Subject: [PATCH 5/5] add todo

---
 lib/src/mustachio/renderer_base.dart | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/src/mustachio/renderer_base.dart b/lib/src/mustachio/renderer_base.dart
index 72b97d41f9..10b4f70e17 100644
--- a/lib/src/mustachio/renderer_base.dart
+++ b/lib/src/mustachio/renderer_base.dart
@@ -365,6 +365,8 @@ class Property<T> {
       required this.renderVariable,
       this.getBool,
       this.renderIterable,
+      // TODO(jcollins-g): consider making this required or emitting warnings
+      // if called on a non-nullable?
       bool Function(T)? isNullValue,
       this.renderValue})
       : isNullValue = (isNullValue ?? (_) => false);