From 4d67ea8c39eefacb23a5637a97ba301b29330987 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Wed, 25 Jan 2023 14:26:03 -0800
Subject: [PATCH] Allow `ignoreDeprecations` in 4.9

---
 src/compiler/commandLineParser.ts                          | 7 ++++++-
 .../ignoreDeprecations/tsconfig.json                       | 5 +++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 tests/baselines/reference/config/showConfig/Shows tsconfig for single option/ignoreDeprecations/tsconfig.json

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index d13f8156e43e3..6081ae9a41932 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -1355,7 +1355,12 @@ namespace ts {
             description: Diagnostics.Control_what_method_is_used_to_detect_module_format_JS_files,
             category: Diagnostics.Language_and_Environment,
             defaultValueDescription: Diagnostics.auto_Colon_Treat_files_with_imports_exports_import_meta_jsx_with_jsx_Colon_react_jsx_or_esm_format_with_module_Colon_node16_as_modules,
-        }
+        },
+        {
+            name: "ignoreDeprecations",
+            type: "string",
+            defaultValueDescription: undefined,
+        },
     ];
 
     /* @internal */
diff --git a/tests/baselines/reference/config/showConfig/Shows tsconfig for single option/ignoreDeprecations/tsconfig.json b/tests/baselines/reference/config/showConfig/Shows tsconfig for single option/ignoreDeprecations/tsconfig.json
new file mode 100644
index 0000000000000..bb117308adcf3
--- /dev/null
+++ b/tests/baselines/reference/config/showConfig/Shows tsconfig for single option/ignoreDeprecations/tsconfig.json	
@@ -0,0 +1,5 @@
+{
+    "compilerOptions": {
+        "ignoreDeprecations": "someString"
+    }
+}