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diff --git a/‎src/compiler/builder.ts
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+355-280Lines changed: 355 additions & 280 deletions b/‎src/compiler/builder.ts
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+355-280Lines changed: 355 additions & 280 deletions
diff --git a/‎src/compiler/builderState.ts
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+4-2Lines changed: 4 additions & 2 deletions b/‎src/compiler/builderState.ts
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+4-2Lines changed: 4 additions & 2 deletions
diff --git a/‎src/compiler/builderStatePublic.ts
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+1-1Lines changed: 1 addition & 1 deletion b/‎src/compiler/builderStatePublic.ts
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+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎src/compiler/commandLineParser.ts
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+113-118Lines changed: 113 additions & 118 deletions b/‎src/compiler/commandLineParser.ts
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+113-118Lines changed: 113 additions & 118 deletions
diff --git a/‎src/compiler/diagnosticMessages.json
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+4Lines changed: 4 additions & 0 deletions b/‎src/compiler/diagnosticMessages.json
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+4Lines changed: 4 additions & 0 deletions
diff --git a/‎src/compiler/emitter.ts
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+39-33Lines changed: 39 additions & 33 deletions b/‎src/compiler/emitter.ts
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+39-33Lines changed: 39 additions & 33 deletions
diff --git a/‎src/compiler/program.ts
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+6-6Lines changed: 6 additions & 6 deletions b/‎src/compiler/program.ts
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+6-6Lines changed: 6 additions & 6 deletions
diff --git a/‎src/compiler/sourcemap.ts
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+3-2Lines changed: 3 additions & 2 deletions b/‎src/compiler/sourcemap.ts
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+3-2Lines changed: 3 additions & 2 deletions
diff --git a/‎src/compiler/transformer.ts
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+4-4Lines changed: 4 additions & 4 deletions b/‎src/compiler/transformer.ts
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+4-4Lines changed: 4 additions & 4 deletions
diff --git a/‎src/compiler/tsbuild.ts
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+2-1Lines changed: 2 additions & 1 deletion b/‎src/compiler/tsbuild.ts
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+2-1Lines changed: 2 additions & 1 deletion
@@ -265,7 +265,8 @@ namespace ts {
         export function create(newProgram: Program, getCanonicalFileName: GetCanonicalFileName, oldState?: Readonly<BuilderState>, disableUseFileVersionAsSignature?: boolean): BuilderState {
             const fileInfos = new Map<Path, FileInfo>();
             const options = newProgram.getCompilerOptions();
-            const referencedMap = options.module !== ModuleKind.None && !outFile(options) ?
+            const isOutFile = outFile(options);
+            const referencedMap = options.module !== ModuleKind.None && !isOutFile ?
                 createManyToManyPathMap() : undefined;
             const exportedModulesMap = referencedMap ? createManyToManyPathMap() : undefined;
             const useOldState = canReuseOldState(referencedMap, oldState);
@@ -299,7 +300,8 @@ namespace ts {
                 fileInfos.set(sourceFile.resolvedPath, {
                     version,
                     signature,
-                    affectsGlobalScope: isFileAffectingGlobalScope(sourceFile) || undefined,
+                    // No need to calculate affectsGlobalScope with --out since its not used at all
+                    affectsGlobalScope: !isOutFile ? isFileAffectingGlobalScope(sourceFile) || undefined : undefined,
                     impliedFormat: sourceFile.impliedNodeFormat
                 });
             }
 
@@ -9,6 +9,6 @@ namespace ts {
         name: string;
         writeByteOrderMark: boolean;
         text: string;
-        /* @internal */ buildInfo?: BuildInfo
+        /* @internal */ data?: WriteFileCallbackData;
     }
 }
@@ -5426,6 +5426,10 @@
         "category": "Message",
         "code": 6405
     },
+    "Project '{0}' is out of date because buildinfo file '{1}' indicates there is change in compilerOptions": {
+        "category": "Message",
+        "code": 6406
+    },
 
     "The expected type comes from property '{0}' which is declared here on type '{1}'": {
         "category": "Message",
 
@@ -257,8 +257,8 @@ namespace ts {
     /*@internal*/
     export function getFirstProjectOutput(configFile: ParsedCommandLine, ignoreCase: boolean): string {
         if (outFile(configFile.options)) {
-            const { jsFilePath } = getOutputPathsForBundle(configFile.options, /*forceDtsPaths*/ false);
-            return Debug.checkDefined(jsFilePath, `project ${configFile.options.configFilePath} expected to have at least one output`);
+            const { jsFilePath, declarationFilePath } = getOutputPathsForBundle(configFile.options, /*forceDtsPaths*/ false);
+            return Debug.checkDefined(jsFilePath || declarationFilePath, `project ${configFile.options.configFilePath} expected to have at least one output`);
         }
 
         const getCommonSourceDirectory = memoize(() => getCommonSourceDirectoryOfConfig(configFile, ignoreCase));
@@ -278,7 +278,7 @@ namespace ts {
 
     /*@internal*/
     // targetSourceFile is when users only want one file in entire project to be emitted. This is used in compileOnSave feature
-    export function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFile: SourceFile | undefined, { scriptTransformers, declarationTransformers }: EmitTransformers, emitOnlyDtsFiles?: boolean, onlyBuildInfo?: boolean, forceDtsEmit?: boolean): EmitResult {
+    export function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFile: SourceFile | undefined, { scriptTransformers, declarationTransformers }: EmitTransformers, emitOnly?: boolean | EmitOnly, onlyBuildInfo?: boolean, forceDtsEmit?: boolean): EmitResult {
         const compilerOptions = host.getCompilerOptions();
         const sourceMapDataList: SourceMapEmitResult[] | undefined = (compilerOptions.sourceMap || compilerOptions.inlineSourceMap || getAreDeclarationMapsEnabled(compilerOptions)) ? [] : undefined;
         const emittedFilesList: string[] | undefined = compilerOptions.listEmittedFiles ? [] : undefined;
@@ -331,7 +331,7 @@ namespace ts {
             tracing?.pop();
 
             if (!emitSkipped && emittedFilesList) {
-                if (!emitOnlyDtsFiles) {
+                if (!emitOnly) {
                     if (jsFilePath) {
                         emittedFilesList.push(jsFilePath);
                     }
@@ -342,11 +342,13 @@ namespace ts {
                         emittedFilesList.push(buildInfoPath);
                     }
                 }
-                if (declarationFilePath) {
-                    emittedFilesList.push(declarationFilePath);
-                }
-                if (declarationMapPath) {
-                    emittedFilesList.push(declarationMapPath);
+                if (emitOnly !== EmitOnly.Js) {
+                    if (declarationFilePath) {
+                        emittedFilesList.push(declarationFilePath);
+                    }
+                    if (declarationMapPath) {
+                        emittedFilesList.push(declarationMapPath);
+                    }
                 }
             }
 
@@ -358,13 +360,11 @@ namespace ts {
         function emitBuildInfo(bundle: BundleBuildInfo | undefined, buildInfoPath: string | undefined) {
             // Write build information if applicable
             if (!buildInfoPath || targetSourceFile || emitSkipped) return;
-            const program = host.getProgramBuildInfo();
             if (host.isEmitBlocked(buildInfoPath)) {
                 emitSkipped = true;
                 return;
             }
-            const version = ts.version; // Extracted into a const so the form is stable between namespace and module
-            const buildInfo: BuildInfo = { bundle, program, version };
+            const buildInfo = host.getBuildInfo(bundle) || createBuildInfo(/*program*/ undefined, bundle);
             // Pass buildinfo as additional data to avoid having to reparse
             writeFile(host, emitterDiagnostics, buildInfoPath, getBuildInfoText(buildInfo), /*writeByteOrderMark*/ false, /*sourceFiles*/ undefined, { buildInfo });
         }
@@ -374,7 +374,7 @@ namespace ts {
             jsFilePath: string | undefined,
             sourceMapFilePath: string | undefined,
             relativeToBuildInfo: (path: string) => string) {
-            if (!sourceFileOrBundle || emitOnlyDtsFiles || !jsFilePath) {
+            if (!sourceFileOrBundle || emitOnly || !jsFilePath) {
                 return;
             }
 
@@ -424,16 +424,16 @@ namespace ts {
             declarationFilePath: string | undefined,
             declarationMapPath: string | undefined,
             relativeToBuildInfo: (path: string) => string) {
-            if (!sourceFileOrBundle) return;
+            if (!sourceFileOrBundle || emitOnly === EmitOnly.Js) return;
             if (!declarationFilePath) {
-                if (emitOnlyDtsFiles || compilerOptions.emitDeclarationOnly) emitSkipped = true;
+                if (emitOnly || compilerOptions.emitDeclarationOnly) emitSkipped = true;
                 return;
             }
             const sourceFiles = isSourceFile(sourceFileOrBundle) ? [sourceFileOrBundle] : sourceFileOrBundle.sourceFiles;
             const filesForEmit = forceDtsEmit ? sourceFiles : filter(sourceFiles, isSourceFileNotJson);
             // Setup and perform the transformation to retrieve declarations from the input files
             const inputListOrBundle = outFile(compilerOptions) ? [factory.createBundle(filesForEmit, !isSourceFile(sourceFileOrBundle) ? sourceFileOrBundle.prepends : undefined)] : filesForEmit;
-            if (emitOnlyDtsFiles && !getEmitDeclarations(compilerOptions)) {
+            if (emitOnly && !getEmitDeclarations(compilerOptions)) {
                 // Checker wont collect the linked aliases since thats only done when declaration is enabled.
                 // Do that here when emitting only dts files
                 filesForEmit.forEach(collectLinkedAliases);
@@ -646,6 +646,12 @@ namespace ts {
         }
     }
 
+    /*@internal*/
+    export function createBuildInfo(program: ProgramBuildInfo | undefined, bundle: BundleBuildInfo | undefined): BuildInfo {
+        const version = ts.version; // Extracted into a const so the form is stable between namespace and module
+        return { bundle, program, version };
+    }
+
     /*@internal*/
     export function getBuildInfoText(buildInfo: BuildInfo) {
         return JSON.stringify(buildInfo);
@@ -822,21 +828,7 @@ namespace ts {
                         if (sourceMapText === text) return;
                         break;
                     case buildInfoPath:
-                        const newBuildInfo = data!.buildInfo!;
-                        newBuildInfo.program = buildInfo.program;
-                        if (newBuildInfo.program && changedDtsText !== undefined && config.options.composite) {
-                            // Update the output signature
-                            (newBuildInfo.program as ProgramBundleEmitBuildInfo).outSignature = computeSignature(changedDtsText, createHash, changedDtsData);
-                        }
-                        // Update sourceFileInfo
-                        const { js, dts, sourceFiles } = buildInfo.bundle!;
-                        newBuildInfo.bundle!.js!.sources = js!.sources;
-                        if (dts) {
-                            newBuildInfo.bundle!.dts!.sources = dts.sources;
-                        }
-                        newBuildInfo.bundle!.sourceFiles = sourceFiles;
-                        outputFiles.push({ name, text: getBuildInfoText(newBuildInfo), writeByteOrderMark, buildInfo: newBuildInfo });
-                        return;
+                        break;
                     case declarationFilePath:
                         if (declarationText === text) return;
                         changedDtsText = text;
@@ -848,13 +840,27 @@ namespace ts {
                     default:
                         Debug.fail(`Unexpected path: ${name}`);
                 }
-                outputFiles.push({ name, text, writeByteOrderMark });
+                outputFiles.push({ name, text, writeByteOrderMark, data });
             },
             isEmitBlocked: returnFalse,
             readFile: f => host.readFile(f),
             fileExists: f => host.fileExists(f),
             useCaseSensitiveFileNames: () => host.useCaseSensitiveFileNames(),
-            getProgramBuildInfo: returnUndefined,
+            getBuildInfo: bundle => {
+                const program = buildInfo.program;
+                if (program && changedDtsText !== undefined && config.options.composite) {
+                    // Update the output signature
+                    (program as ProgramBundleEmitBuildInfo).outSignature = computeSignature(changedDtsText, createHash, changedDtsData);
+                }
+                // Update sourceFileInfo
+                const { js, dts, sourceFiles } = buildInfo.bundle!;
+                bundle!.js!.sources = js!.sources;
+                if (dts) {
+                    bundle!.dts!.sources = dts.sources;
+                }
+                bundle!.sourceFiles = sourceFiles;
+                return createBuildInfo(program, bundle);
+            },
             getSourceFileFromReference: returnUndefined,
             redirectTargetsMap: createMultiMap(),
             getFileIncludeReasons: notImplemented,
 
@@ -1967,7 +1967,7 @@ namespace ts {
                     return host.fileExists(f);
                 },
                 useCaseSensitiveFileNames: () => host.useCaseSensitiveFileNames(),
-                getProgramBuildInfo: () => program.getProgramBuildInfo && program.getProgramBuildInfo(),
+                getBuildInfo: bundle => program.getBuildInfo?.(bundle),
                 getSourceFileFromReference: (file, ref) => program.getSourceFileFromReference(file, ref),
                 redirectTargetsMap,
                 getFileIncludeReasons: program.getFileIncludeReasons,
@@ -2058,9 +2058,9 @@ namespace ts {
             return typeChecker || (typeChecker = createTypeChecker(program));
         }
 
-        function emit(sourceFile?: SourceFile, writeFileCallback?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, transformers?: CustomTransformers, forceDtsEmit?: boolean): EmitResult {
+        function emit(sourceFile?: SourceFile, writeFileCallback?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnly?: boolean | EmitOnly, transformers?: CustomTransformers, forceDtsEmit?: boolean): EmitResult {
             tracing?.push(tracing.Phase.Emit, "emit", { path: sourceFile?.path }, /*separateBeginAndEnd*/ true);
-            const result = runWithCancellationToken(() => emitWorker(program, sourceFile, writeFileCallback, cancellationToken, emitOnlyDtsFiles, transformers, forceDtsEmit));
+            const result = runWithCancellationToken(() => emitWorker(program, sourceFile, writeFileCallback, cancellationToken, emitOnly, transformers, forceDtsEmit));
             tracing?.pop();
             return result;
         }
@@ -2069,7 +2069,7 @@ namespace ts {
             return hasEmitBlockingDiagnostics.has(toPath(emitFileName));
         }
 
-        function emitWorker(program: Program, sourceFile: SourceFile | undefined, writeFileCallback: WriteFileCallback | undefined, cancellationToken: CancellationToken | undefined, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers, forceDtsEmit?: boolean): EmitResult {
+        function emitWorker(program: Program, sourceFile: SourceFile | undefined, writeFileCallback: WriteFileCallback | undefined, cancellationToken: CancellationToken | undefined, emitOnly?: boolean | EmitOnly, customTransformers?: CustomTransformers, forceDtsEmit?: boolean): EmitResult {
             if (!forceDtsEmit) {
                 const result = handleNoEmitOptions(program, sourceFile, writeFileCallback, cancellationToken);
                 if (result) return result;
@@ -2091,8 +2091,8 @@ namespace ts {
                 emitResolver,
                 getEmitHost(writeFileCallback),
                 sourceFile,
-                getTransformers(options, customTransformers, emitOnlyDtsFiles),
-                emitOnlyDtsFiles,
+                getTransformers(options, customTransformers, emitOnly),
+                emitOnly,
                 /*onlyBuildInfo*/ false,
                 forceDtsEmit
             );
 
@@ -322,9 +322,10 @@ namespace ts {
     }
 
     // Sometimes tools can see the following line as a source mapping url comment, so we mangle it a bit (the [M])
-    const sourceMapCommentRegExp = /^\/\/[@#] source[M]appingURL=(.+)\r?\n?$/;
+    export const sourceMapCommentRegExpDontCareLineStart = /\/\/[@#] source[M]appingURL=(.+)\r?\n?$/;
+    export const sourceMapCommentRegExp = /^\/\/[@#] source[M]appingURL=(.+)\r?\n?$/;
 
-    const whitespaceOrMapCommentRegExp = /^\s*(\/\/[@#] .*)?$/;
+    export const whitespaceOrMapCommentRegExp = /^\s*(\/\/[@#] .*)?$/;
 
     export interface LineInfo {
         getLineCount(): number;
 
@@ -31,15 +31,15 @@ namespace ts {
 
     export const noTransformers: EmitTransformers = { scriptTransformers: emptyArray, declarationTransformers: emptyArray };
 
-    export function getTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers, emitOnlyDtsFiles?: boolean): EmitTransformers {
+    export function getTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers, emitOnly?: boolean | EmitOnly): EmitTransformers {
         return {
-            scriptTransformers: getScriptTransformers(compilerOptions, customTransformers, emitOnlyDtsFiles),
+            scriptTransformers: getScriptTransformers(compilerOptions, customTransformers, emitOnly),
             declarationTransformers: getDeclarationTransformers(customTransformers),
         };
     }
 
-    function getScriptTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers, emitOnlyDtsFiles?: boolean) {
-        if (emitOnlyDtsFiles) return emptyArray;
+    function getScriptTransformers(compilerOptions: CompilerOptions, customTransformers?: CustomTransformers, emitOnly?: boolean | EmitOnly) {
+        if (emitOnly) return emptyArray;
 
         const languageVersion = getEmitScriptTarget(compilerOptions);
         const moduleKind = getEmitModuleKind(compilerOptions);
 
@@ -20,6 +20,7 @@ namespace ts {
         OutOfDateWithSelf,
         OutOfDateWithUpstream,
         OutOfDateBuildInfo,
+        OutOfDateOptions,
         UpstreamOutOfDate,
         UpstreamBlocked,
         ComputingUpstream,
@@ -116,7 +117,7 @@ namespace ts {
          * Buildinfo indicates that build is out of date
          */
         export interface OutOfDateBuildInfo {
-            type: UpToDateStatusType.OutOfDateBuildInfo,
+            type: UpToDateStatusType.OutOfDateBuildInfo | UpToDateStatusType.OutOfDateOptions,
             buildInfoFile: string;
         }
Original file line number	Diff line number	Diff line change
`@@ -9,6 +9,6 @@ namespace ts {`
`9`	`9`	`name: string;`
`10`	`10`	`writeByteOrderMark: boolean;`
`11`	`11`	`text: string;`
`12`		`- /* @internal */ buildInfo?: BuildInfo`
	`12`	`+ /* @internal */ data?: WriteFileCallbackData;`
`13`	`13`	`}`
`14`	`14`	`}`