diff --git a/src/testRunner/tsconfig.json b/src/testRunner/tsconfig.json
index 401c5aeb68a8d..200149a3d08f2 100644
--- a/src/testRunner/tsconfig.json
+++ b/src/testRunner/tsconfig.json
@@ -147,6 +147,7 @@
         "unittests/tsbuildWatch/noEmitOnError.ts",
         "unittests/tsbuildWatch/programUpdates.ts",
         "unittests/tsbuildWatch/publicApi.ts",
+        "unittests/tsbuildWatch/publicApiImpliedNodeFormat.ts",
         "unittests/tsbuildWatch/reexport.ts",
         "unittests/tsbuildWatch/watchEnvironment.ts",
         "unittests/tsc/composite.ts",
diff --git a/src/testRunner/unittests/tsbuildWatch/publicApiImpliedNodeFormat.ts b/src/testRunner/unittests/tsbuildWatch/publicApiImpliedNodeFormat.ts
new file mode 100644
index 0000000000000..d653c77ad6139
--- /dev/null
+++ b/src/testRunner/unittests/tsbuildWatch/publicApiImpliedNodeFormat.ts
@@ -0,0 +1,250 @@
+namespace ts.tscWatch {
+    it("unittests:: tsbuildWatch:: watchMode:: Public API with custom transformers impliedNodeFormat", () => {
+        const solution: File = {
+            path: `${projectRoot}/tsconfig.json`,
+            content: JSON.stringify({
+                references: [
+                    { path: "./shared/tsconfig.json" },
+                    { path: "./webpack/tsconfig.json" }
+                ],
+                files: []
+            })
+        };
+        const sharedConfigOptions: File = {
+            path: `${projectRoot}/shared/tsconfig.options.json`,
+            content: JSON.stringify({
+                compilerOptions: {
+                    //module:"Node12",  == NOT NEEDED
+                    lib: ["es2020"],
+                    moduleResolution: "Node12", // absolutely needed
+                    target: "es2020",
+                },
+            })
+        };
+        const sharedConfig: File = {
+            path: `${projectRoot}/shared/tsconfig.json`,
+            content: JSON.stringify({
+                extends:"./tsconfig.options.json",
+                compilerOptions: {
+                    composite: true
+                },
+            })
+        };
+        const sharedPackageJson: File = {
+            path: `${projectRoot}/shared/package.json`,
+            content: JSON.stringify({
+                name:"shared",
+                version:"1.0.0",
+                type:"commonjs",
+            })
+        };
+        const sharedIndex: File = {
+            path: `${projectRoot}/shared/index.ts`,
+            content: `export function f1() { }
+export class c { }
+export enum e { }
+// leading
+export function f2() { } // trailing`
+        };
+        const webpackConfig: File = {
+            path: `${projectRoot}/webpack/tsconfig.json`,
+            content: JSON.stringify({
+                compilerOptions: { composite: true, },
+                references: [{ path: "../shared/tsconfig.json" }]
+            })
+        };
+        const webpackIndex: File = {
+            path: `${projectRoot}/webpack/index.ts`,
+            content: `export function f2() { }
+export class c2 { }
+export enum e2 { }
+// leading
+export function f22() { } // trailing`
+        };
+        const commandLineArgs = ["--b", "--w", /*"--verbose"*/];
+        const { sys, baseline, oldSnap, cb, getPrograms } = createBaseline(createWatchedSystem([libFile, { ...libFile, path: "/a/lib/lib.es2020.d.ts" }, solution, sharedConfig, sharedConfigOptions, sharedPackageJson, sharedIndex, webpackConfig, webpackIndex], { currentDirectory: projectRoot }));
+
+        const writeToConsole = false; // MUST BE false WHEN NOT TESTING SINGULARLY
+        if (writeToConsole){
+            const origSysWrite = sys.write.bind(sys);
+            sys.write = (message: string)=>{
+                console.log(message);
+                origSysWrite(message);
+            };
+        }
+        type ImpliedNodeFormat = ModuleKind.CommonJS | ModuleKind.ESNext | undefined;
+        const impliedNodeFormatToString = (f: ImpliedNodeFormat)=>(f===undefined)? "undefined" : ModuleKind[f];
+        const lastImpliedNodeFormats = new Map<string,{impliedNodeFormat: ImpliedNodeFormat /*, gotImpledNodeFormat: ImpliedNodeFormat*/}>();
+        function printLastImpliedNodeFormats(){
+            lastImpliedNodeFormats.forEach((x,fileName)=>{
+                sys.write(`fileName:${fileName},impliedNodeFormat:${impliedNodeFormatToString(x.impliedNodeFormat)}`+sys.newLine);
+            });
+        }
+        const buildHost = createSolutionBuilderWithWatchHostForBaseline(sys, cb);
+        buildHost.getCustomTransformers = getCustomTransformers;
+        const builder = createSolutionBuilderWithWatch(buildHost, [solution.path], { verbose: true });
+        const compilerOptions: {
+            lib: ["es2020"],
+            target: "es2020"
+            moduleResolution?: "Node12" | "NodeNext", // absolutely needed
+            module?: "Node12" | "NodeNext"
+        }={
+            lib: ["es2020"],
+            moduleResolution: "Node12",
+            target: "es2020",
+        };
+
+        builder.build();
+        runWatchBaseline({
+            scenario: "publicApi",
+            subScenario: "with custom transformers impliedNodeFormat",
+            commandLineArgs,
+            sys,
+            baseline,
+            oldSnap,
+            getPrograms,
+            changes: [
+                {
+                    caption: "change to shared",
+                    change: sys => sys.prependFile(sharedIndex.path, "export function fooBar() {}"),
+                    timeouts: sys => {
+                        sys.checkTimeoutQueueLengthAndRun(1); // Shared
+                        sys.checkTimeoutQueueLengthAndRun(1); // webpack
+                        sys.checkTimeoutQueueLengthAndRun(1); // solution
+                        sys.checkTimeoutQueueLength(0);
+                        printLastImpliedNodeFormats();
+                        if (lastImpliedNodeFormats.get("/user/username/projects/myproject/shared/index.ts")?.impliedNodeFormat!==ModuleKind.CommonJS) {
+                            throw new Error(`Expecting impliedNodeFormat for /user/username/projects/myproject/shared/index.ts to be ModuleKind.CommonJS`);
+                        }
+                        else {
+                            sys.write(`impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.CommonJS`);
+                        }
+                    }
+                },
+                {
+                    caption: "change package.json type to module",
+                    change: sys => sys.writeFile(sharedPackageJson.path, sharedPackageJson.content.replace("commonjs","module")),
+                    timeouts: sys => {
+                        sys.checkTimeoutQueueLengthAndRun(1); // Shared
+                        sys.checkTimeoutQueueLengthAndRun(1); // webpack
+                        sys.checkTimeoutQueueLengthAndRun(1); // solution
+                        sys.checkTimeoutQueueLength(0);
+                        printLastImpliedNodeFormats();
+                        if (lastImpliedNodeFormats.get("/user/username/projects/myproject/shared/index.ts")?.impliedNodeFormat!==ModuleKind.ESNext) {
+                            throw new Error(`Expecting impliedNodeFormat for /user/username/projects/myproject/shared/index.ts to be ModuleKind.ESNext`);
+                        }
+                        else {
+                            sys.write(`impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.ESNext`);
+                        }
+                    }
+                },
+                {
+                    caption: "date change package.json",
+                    change: sys => {
+                        sys.writeFile(sharedPackageJson.path, sharedPackageJson.content.replace("commonjs","module"));
+                    },
+                    timeouts: sys => {
+                        sys.checkTimeoutQueueLengthAndRun(1); // Shared
+                        sys.checkTimeoutQueueLengthAndRun(1); // webpack
+                        sys.checkTimeoutQueueLengthAndRun(1); // solution
+                        sys.checkTimeoutQueueLength(0);
+                        printLastImpliedNodeFormats();
+                        if (lastImpliedNodeFormats.get("/user/username/projects/myproject/shared/index.ts")?.impliedNodeFormat!==ModuleKind.ESNext) {
+                            throw new Error(`Expecting impliedNodeFormat for /user/username/projects/myproject/shared/index.ts to be ModuleKind.ESNext`);
+                        }
+                        else {
+                            sys.write(`impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.ESNext`);
+                        }
+                    }
+                },
+                {
+                    caption: "tsconfig  compilerOptions -> module:node12, moduleResolution omitted",
+                    change: sys => {
+                        const co: Partial<typeof compilerOptions>= { ...compilerOptions };
+                        delete co.moduleResolution;
+                        co.module = "Node12";
+                        const tsconfig = { compilerOptions:co };
+                        sys.writeFile(sharedConfigOptions.path, JSON.stringify(tsconfig));
+                    },
+                    timeouts: sys => {
+                        sys.checkTimeoutQueueLengthAndRun(1); // Shared
+                        sys.checkTimeoutQueueLengthAndRun(1); // webpack
+                        sys.checkTimeoutQueueLengthAndRun(1); // solution
+                        sys.checkTimeoutQueueLength(0);
+                        printLastImpliedNodeFormats();
+                        if (lastImpliedNodeFormats.get("/user/username/projects/myproject/shared/index.ts")?.impliedNodeFormat!==ModuleKind.ESNext) {
+                            throw new Error(`Expecting impliedNodeFormat for /user/username/projects/myproject/shared/index.ts to be ModuleKind.ESNext`);
+                        }
+                        else {
+                            sys.write(`impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.ESNext`);
+                        }
+                    }
+                },
+                {
+                    caption: "tsconfig  compilerOptions -> module:node12, moduleResolution: node",
+                    change: sys => {
+                        const co: Partial<typeof compilerOptions>= { ...compilerOptions };
+                        delete co.moduleResolution;
+                        co.module = "Node12";
+                        (co.moduleResolution as any) = "Node";
+                        const tsconfig = { compilerOptions:co };
+                        sys.writeFile(sharedConfigOptions.path, JSON.stringify(tsconfig));
+                    },
+                    timeouts: sys => {
+                        sys.checkTimeoutQueueLengthAndRun(1); // Shared
+                        sys.checkTimeoutQueueLengthAndRun(1); // webpack
+                        sys.checkTimeoutQueueLengthAndRun(1); // solution
+                        sys.checkTimeoutQueueLength(0);
+                        printLastImpliedNodeFormats();
+                        if (lastImpliedNodeFormats.get("/user/username/projects/myproject/shared/index.ts")?.impliedNodeFormat!==undefined) {
+                            throw new Error(`Expecting impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is not undefined`);
+                        }
+                        else {
+                            sys.write(`impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is undefined, as expected`);
+                        }
+                    }
+                }
+            ],
+            watchOrSolution: builder
+        });
+
+        function getCustomTransformers(project: string): CustomTransformers {
+            const before: TransformerFactory<SourceFile> = context => {
+                return file => {
+                    sys.write(`project=${project}, file.impliedNodeFormat=${impliedNodeFormatToString(file.impliedNodeFormat)}`);
+                    lastImpliedNodeFormats.set(file.fileName,{ impliedNodeFormat : file.impliedNodeFormat });
+                    return visitEachChild(file, visit, context);
+                };
+                function visit(node: Node): VisitResult<Node> {
+                    switch (node.kind) {
+                        case SyntaxKind.FunctionDeclaration:
+                            return visitFunction(node as FunctionDeclaration);
+                        default:
+                            return visitEachChild(node, visit, context);
+                    }
+                }
+                function visitFunction(node: FunctionDeclaration) {
+                    addSyntheticLeadingComment(node, SyntaxKind.MultiLineCommentTrivia, `@before${project}`, /*hasTrailingNewLine*/ true);
+                    return node;
+                }
+            };
+
+            const after: TransformerFactory<SourceFile> = context => {
+                return file => visitEachChild(file, visit, context);
+                function visit(node: Node): VisitResult<Node> {
+                    switch (node.kind) {
+                        case SyntaxKind.VariableStatement:
+                            return visitVariableStatement(node as VariableStatement);
+                        default:
+                            return visitEachChild(node, visit, context);
+                    }
+                }
+                function visitVariableStatement(node: VariableStatement) {
+                    addSyntheticLeadingComment(node, SyntaxKind.SingleLineCommentTrivia, `@after${project}`);
+                    return node;
+                }
+            };
+            return { before: [before], after: [after] };
+        }
+    });
+}
diff --git a/tests/baselines/reference/tsbuildWatch/publicApi/with-custom-transformers-impliedNodeFormat.js b/tests/baselines/reference/tsbuildWatch/publicApi/with-custom-transformers-impliedNodeFormat.js
new file mode 100644
index 0000000000000..e9c94605e4f01
--- /dev/null
+++ b/tests/baselines/reference/tsbuildWatch/publicApi/with-custom-transformers-impliedNodeFormat.js
@@ -0,0 +1,878 @@
+Input::
+//// [/a/lib/lib.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+//// [/a/lib/lib.es2020.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+//// [/user/username/projects/myproject/tsconfig.json]
+{"references":[{"path":"./shared/tsconfig.json"},{"path":"./webpack/tsconfig.json"}],"files":[]}
+
+//// [/user/username/projects/myproject/shared/tsconfig.json]
+{"extends":"./tsconfig.options.json","compilerOptions":{"composite":true}}
+
+//// [/user/username/projects/myproject/shared/tsconfig.options.json]
+{"compilerOptions":{"lib":["es2020"],"moduleResolution":"Node12","target":"es2020"}}
+
+//// [/user/username/projects/myproject/shared/package.json]
+{"name":"shared","version":"1.0.0","type":"commonjs"}
+
+//// [/user/username/projects/myproject/shared/index.ts]
+export function f1() { }
+export class c { }
+export enum e { }
+// leading
+export function f2() { } // trailing
+
+//// [/user/username/projects/myproject/webpack/tsconfig.json]
+{"compilerOptions":{"composite":true},"references":[{"path":"../shared/tsconfig.json"}]}
+
+//// [/user/username/projects/myproject/webpack/index.ts]
+export function f2() { }
+export class c2 { }
+export enum e2 { }
+// leading
+export function f22() { } // trailing
+
+
+/a/lib/tsc.js --b --w
+Output::
+[12:00:37 AM] Projects in this build: 
+    * shared/tsconfig.json
+    * webpack/tsconfig.json
+    * tsconfig.json
+
+[12:00:38 AM] Project 'shared/tsconfig.json' is out of date because output file 'shared/index.js' does not exist
+
+[12:00:39 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+project=/user/username/projects/myproject/shared/tsconfig.json, file.impliedNodeFormat=CommonJS[12:00:48 AM] Project 'webpack/tsconfig.json' is out of date because output file 'webpack/index.js' does not exist
+
+[12:00:49 AM] Building project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+project=/user/username/projects/myproject/webpack/tsconfig.json, file.impliedNodeFormat=undefined[12:00:58 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"lib":["lib.es2020.d.ts"],"moduleResolution":3,"target":7,"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Shape signatures in builder refreshed for::
+/a/lib/lib.es2020.d.ts (used version)
+/user/username/projects/myproject/shared/index.ts (used version)
+
+Program root files: ["/user/username/projects/myproject/webpack/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/webpack/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+Shape signatures in builder refreshed for::
+/a/lib/lib.d.ts (used version)
+/user/username/projects/myproject/webpack/index.ts (used version)
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/tsconfig.options.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.options.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/shared/package.json:
+  {"fileName":"/user/username/projects/myproject/shared/package.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/package.json:
+  {"fileName":"/user/username/projects/myproject/webpack/package.json","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js]
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function f1() { }
+export class c {
+}
+//@after/user/username/projects/myproject/shared/tsconfig.json
+export var e;
+(function (e) {
+})(e || (e = {}));
+// leading
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function f2() { } // trailing
+
+
+//// [/user/username/projects/myproject/shared/index.d.ts]
+export declare function f1(): void;
+export declare class c {
+}
+export declare enum e {
+}
+export declare function f2(): void;
+
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.es2020.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true,"impliedFormat":1},{"version":"8649344783-export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing","impliedFormat":1}],"options":{"composite":true,"target":7},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.es2020.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true,
+        "impliedFormat": 1
+      },
+      "./index.ts": {
+        "version": "8649344783-export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "signature": "8649344783-export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "impliedFormat": 1
+      }
+    },
+    "options": {
+      "composite": true,
+      "target": 7
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 811
+}
+
+//// [/user/username/projects/myproject/webpack/index.js]
+"use strict";
+exports.__esModule = true;
+exports.f22 = exports.e2 = exports.c2 = exports.f2 = void 0;
+/*@before/user/username/projects/myproject/webpack/tsconfig.json*/
+function f2() { }
+exports.f2 = f2;
+//@after/user/username/projects/myproject/webpack/tsconfig.json
+var c2 = /** @class */ (function () {
+    function c2() {
+    }
+    return c2;
+}());
+exports.c2 = c2;
+//@after/user/username/projects/myproject/webpack/tsconfig.json
+var e2;
+(function (e2) {
+})(e2 = exports.e2 || (exports.e2 = {}));
+// leading
+/*@before/user/username/projects/myproject/webpack/tsconfig.json*/
+function f22() { } // trailing
+exports.f22 = f22;
+
+
+//// [/user/username/projects/myproject/webpack/index.d.ts]
+export declare function f2(): void;
+export declare class c2 {
+}
+export declare enum e2 {
+}
+export declare function f22(): void;
+
+
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},"20140662566-export function f2() { }\nexport class c2 { }\nexport enum e2 { }\n// leading\nexport function f22() { } // trailing"],"options":{"composite":true},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true
+      },
+      "./index.ts": {
+        "version": "20140662566-export function f2() { }\nexport class c2 { }\nexport enum e2 { }\n// leading\nexport function f22() { } // trailing",
+        "signature": "20140662566-export function f2() { }\nexport class c2 { }\nexport enum e2 { }\n// leading\nexport function f22() { } // trailing"
+      }
+    },
+    "options": {
+      "composite": true
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 749
+}
+
+
+Change:: change to shared
+
+Input::
+//// [/user/username/projects/myproject/shared/index.ts]
+export function fooBar() {}export function f1() { }
+export class c { }
+export enum e { }
+// leading
+export function f2() { } // trailing
+
+
+Output::
+>> Screen clear
+[12:01:01 AM] File change detected. Starting incremental compilation...
+
+[12:01:02 AM] Project 'shared/tsconfig.json' is out of date because oldest output 'shared/index.js' is older than newest input 'shared/index.ts'
+
+[12:01:03 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+project=/user/username/projects/myproject/shared/tsconfig.json, file.impliedNodeFormat=CommonJS[12:01:16 AM] Project 'webpack/tsconfig.json' is out of date because oldest output 'webpack/index.js' is older than newest input 'shared/tsconfig.json'
+
+[12:01:17 AM] Building project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:19 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:20 AM] Found 0 errors. Watching for file changes.
+
+fileName:/user/username/projects/myproject/shared/index.ts,impliedNodeFormat:CommonJS
+fileName:/user/username/projects/myproject/webpack/index.ts,impliedNodeFormat:undefined
+impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.CommonJS
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"lib":["lib.es2020.d.ts"],"moduleResolution":3,"target":7,"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/shared/index.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/shared/index.ts (computed .d.ts)
+
+Program root files: ["/user/username/projects/myproject/webpack/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/webpack/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+Semantic diagnostics in builder refreshed for::
+
+No shapes updated in the builder::
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/tsconfig.options.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.options.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/shared/package.json:
+  {"fileName":"/user/username/projects/myproject/shared/package.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/package.json:
+  {"fileName":"/user/username/projects/myproject/webpack/package.json","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js]
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function fooBar() { }
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function f1() { }
+export class c {
+}
+//@after/user/username/projects/myproject/shared/tsconfig.json
+export var e;
+(function (e) {
+})(e || (e = {}));
+// leading
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function f2() { } // trailing
+
+
+//// [/user/username/projects/myproject/shared/index.d.ts]
+export declare function fooBar(): void;
+export declare function f1(): void;
+export declare class c {
+}
+export declare enum e {
+}
+export declare function f2(): void;
+
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.es2020.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true,"impliedFormat":1},{"version":"14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing","signature":"1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n","impliedFormat":1}],"options":{"composite":true,"target":7},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.es2020.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true,
+        "impliedFormat": 1
+      },
+      "./index.ts": {
+        "version": "14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "signature": "1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n",
+        "impliedFormat": 1
+      }
+    },
+    "options": {
+      "composite": true,
+      "target": 7
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 1037
+}
+
+//// [/user/username/projects/myproject/webpack/index.js] file changed its modified time
+//// [/user/username/projects/myproject/webpack/index.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo] file changed its modified time
+
+Change:: change package.json type to module
+
+Input::
+//// [/user/username/projects/myproject/shared/package.json]
+{"name":"shared","version":"1.0.0","type":"module"}
+
+
+Output::
+>> Screen clear
+[12:01:24 AM] File change detected. Starting incremental compilation...
+
+[12:01:25 AM] Project 'shared/tsconfig.json' is out of date because oldest output 'shared/index.js' is older than newest input 'shared/package.json'
+
+[12:01:26 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+project=/user/username/projects/myproject/shared/tsconfig.json, file.impliedNodeFormat=ESNext[12:01:39 AM] Project 'webpack/tsconfig.json' is out of date because oldest output 'webpack/index.js' is older than newest input 'shared/package.json'
+
+[12:01:40 AM] Building project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:42 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:43 AM] Found 0 errors. Watching for file changes.
+
+fileName:/user/username/projects/myproject/shared/index.ts,impliedNodeFormat:ESNext
+fileName:/user/username/projects/myproject/webpack/index.ts,impliedNodeFormat:undefined
+impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.ESNext
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"lib":["lib.es2020.d.ts"],"moduleResolution":3,"target":7,"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/shared/index.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/shared/index.ts (computed .d.ts)
+
+Program root files: ["/user/username/projects/myproject/webpack/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/webpack/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+Semantic diagnostics in builder refreshed for::
+
+No shapes updated in the builder::
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/tsconfig.options.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.options.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/shared/package.json:
+  {"fileName":"/user/username/projects/myproject/shared/package.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/package.json:
+  {"fileName":"/user/username/projects/myproject/webpack/package.json","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js] file written with same contents
+//// [/user/username/projects/myproject/shared/index.d.ts] file written with same contents
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.es2020.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true,"impliedFormat":1},{"version":"14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing","signature":"1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n","impliedFormat":99}],"options":{"composite":true,"target":7},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.es2020.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true,
+        "impliedFormat": 1
+      },
+      "./index.ts": {
+        "version": "14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "signature": "1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n",
+        "impliedFormat": 99
+      }
+    },
+    "options": {
+      "composite": true,
+      "target": 7
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 1038
+}
+
+//// [/user/username/projects/myproject/webpack/index.js] file changed its modified time
+//// [/user/username/projects/myproject/webpack/index.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo] file changed its modified time
+
+Change:: date change package.json
+
+Input::
+//// [/user/username/projects/myproject/shared/package.json] file written with same contents
+
+Output::
+>> Screen clear
+[12:01:47 AM] File change detected. Starting incremental compilation...
+
+[12:01:48 AM] Project 'shared/tsconfig.json' is out of date because oldest output 'shared/index.js' is older than newest input 'shared/package.json'
+
+[12:01:49 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+[12:01:51 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+[12:01:52 AM] Project 'webpack/tsconfig.json' is out of date because oldest output 'webpack/index.js' is older than newest input 'shared/package.json'
+
+[12:01:53 AM] Building project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:55 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:56 AM] Found 0 errors. Watching for file changes.
+
+fileName:/user/username/projects/myproject/shared/index.ts,impliedNodeFormat:ESNext
+fileName:/user/username/projects/myproject/webpack/index.ts,impliedNodeFormat:undefined
+impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.ESNext
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"lib":["lib.es2020.d.ts"],"moduleResolution":3,"target":7,"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+
+No shapes updated in the builder::
+
+Program root files: ["/user/username/projects/myproject/webpack/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/webpack/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+Semantic diagnostics in builder refreshed for::
+
+No shapes updated in the builder::
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/tsconfig.options.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.options.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/shared/package.json:
+  {"fileName":"/user/username/projects/myproject/shared/package.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/package.json:
+  {"fileName":"/user/username/projects/myproject/webpack/package.json","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js] file changed its modified time
+//// [/user/username/projects/myproject/shared/index.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo] file changed its modified time
+//// [/user/username/projects/myproject/webpack/index.js] file changed its modified time
+//// [/user/username/projects/myproject/webpack/index.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo] file changed its modified time
+
+Change:: tsconfig  compilerOptions -> module:node12, moduleResolution omitted
+
+Input::
+//// [/user/username/projects/myproject/shared/tsconfig.options.json]
+{"compilerOptions":{"lib":["es2020"],"target":"es2020","module":"Node12"}}
+
+
+Output::
+>> Screen clear
+[12:02:00 AM] File change detected. Starting incremental compilation...
+
+[12:02:01 AM] Project 'shared/tsconfig.json' is out of date because oldest output 'shared/index.js' is older than newest input 'shared/tsconfig.options.json'
+
+[12:02:02 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+project=/user/username/projects/myproject/shared/tsconfig.json, file.impliedNodeFormat=ESNext[12:02:15 AM] Project 'webpack/tsconfig.json' is up to date with .d.ts files from its dependencies
+
+[12:02:17 AM] Updating output timestamps of project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:02:18 AM] Found 0 errors. Watching for file changes.
+
+fileName:/user/username/projects/myproject/shared/index.ts,impliedNodeFormat:ESNext
+fileName:/user/username/projects/myproject/webpack/index.ts,impliedNodeFormat:undefined
+impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is correctly ModuleKind.ESNext
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"lib":["lib.es2020.d.ts"],"target":7,"module":100,"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+
+No shapes updated in the builder::
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/tsconfig.options.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.options.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/shared/package.json:
+  {"fileName":"/user/username/projects/myproject/shared/package.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/package.json:
+  {"fileName":"/user/username/projects/myproject/webpack/package.json","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js]
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function fooBar() { }
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function f1() { }
+export class c {
+}
+//@after/user/username/projects/myproject/shared/tsconfig.json
+export var e;
+(function (e) {
+})(e = e || (e = {}));
+// leading
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+export function f2() { } // trailing
+
+
+//// [/user/username/projects/myproject/shared/index.d.ts] file written with same contents
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.es2020.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true,"impliedFormat":1},{"version":"14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing","signature":"1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n","impliedFormat":99}],"options":{"composite":true,"module":100,"target":7},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.es2020.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true,
+        "impliedFormat": 1
+      },
+      "./index.ts": {
+        "version": "14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "signature": "1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n",
+        "impliedFormat": 99
+      }
+    },
+    "options": {
+      "composite": true,
+      "module": 100,
+      "target": 7
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 1051
+}
+
+//// [/user/username/projects/myproject/webpack/index.js] file changed its modified time
+//// [/user/username/projects/myproject/webpack/index.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo] file changed its modified time
+
+Change:: tsconfig  compilerOptions -> module:node12, moduleResolution: node
+
+Input::
+//// [/user/username/projects/myproject/shared/tsconfig.options.json]
+{"compilerOptions":{"lib":["es2020"],"target":"es2020","module":"Node12","moduleResolution":"Node"}}
+
+
+Output::
+>> Screen clear
+[12:02:22 AM] File change detected. Starting incremental compilation...
+
+[12:02:23 AM] Project 'shared/tsconfig.json' is out of date because oldest output 'shared/index.js' is older than newest input 'shared/tsconfig.options.json'
+
+[12:02:24 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+project=/user/username/projects/myproject/shared/tsconfig.json, file.impliedNodeFormat=undefined[12:02:37 AM] Project 'webpack/tsconfig.json' is up to date with .d.ts files from its dependencies
+
+[12:02:39 AM] Updating output timestamps of project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:02:40 AM] Found 0 errors. Watching for file changes.
+
+fileName:/user/username/projects/myproject/shared/index.ts,impliedNodeFormat:undefined
+fileName:/user/username/projects/myproject/webpack/index.ts,impliedNodeFormat:undefined
+impliedNodeFormat for /user/username/projects/myproject/shared/index.ts is undefined, as expected
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"lib":["lib.es2020.d.ts"],"target":7,"module":100,"moduleResolution":2,"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.es2020.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Shape signatures in builder refreshed for::
+/a/lib/lib.es2020.d.ts (used version)
+/user/username/projects/myproject/shared/index.ts (computed .d.ts)
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/tsconfig.options.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.options.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/shared/package.json:
+  {"fileName":"/user/username/projects/myproject/shared/package.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/package.json:
+  {"fileName":"/user/username/projects/myproject/webpack/package.json","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.f2 = exports.e = exports.c = exports.f1 = exports.fooBar = void 0;
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function fooBar() { }
+exports.fooBar = fooBar;
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function f1() { }
+exports.f1 = f1;
+class c {
+}
+exports.c = c;
+//@after/user/username/projects/myproject/shared/tsconfig.json
+var e;
+(function (e) {
+})(e = exports.e || (exports.e = {}));
+// leading
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function f2() { } // trailing
+exports.f2 = f2;
+
+
+//// [/user/username/projects/myproject/shared/index.d.ts] file written with same contents
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.es2020.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},{"version":"14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing","signature":"1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n"}],"options":{"composite":true,"module":100,"target":7},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.es2020.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true
+      },
+      "./index.ts": {
+        "version": "14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "signature": "1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n"
+      }
+    },
+    "options": {
+      "composite": true,
+      "module": 100,
+      "target": 7
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.es2020.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 1014
+}
+
+//// [/user/username/projects/myproject/webpack/index.js] file changed its modified time
+//// [/user/username/projects/myproject/webpack/index.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo] file changed its modified time