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diff --git a/‎src/compiler/builder.ts
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+308-242Lines changed: 308 additions & 242 deletions b/‎src/compiler/builder.ts
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+308-242Lines changed: 308 additions & 242 deletions
diff --git a/‎src/compiler/builderPublic.ts
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+7-2Lines changed: 7 additions & 2 deletions b/‎src/compiler/builderPublic.ts
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+7-2Lines changed: 7 additions & 2 deletions
diff --git a/‎src/compiler/builderState.ts
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+64-122Lines changed: 64 additions & 122 deletions b/‎src/compiler/builderState.ts
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+64-122Lines changed: 64 additions & 122 deletions
diff --git a/‎src/compiler/builderStatePublic.ts
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+1Lines changed: 1 addition & 0 deletions b/‎src/compiler/builderStatePublic.ts
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+1Lines changed: 1 addition & 0 deletions
diff --git a/‎src/compiler/commandLineParser.ts
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+116-26Lines changed: 116 additions & 26 deletions b/‎src/compiler/commandLineParser.ts
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+116-26Lines changed: 116 additions & 26 deletions
diff --git a/‎src/compiler/diagnosticMessages.json
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+10-2Lines changed: 10 additions & 2 deletions b/‎src/compiler/diagnosticMessages.json
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+10-2Lines changed: 10 additions & 2 deletions
diff --git a/‎src/compiler/emitter.ts
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+46-9Lines changed: 46 additions & 9 deletions b/‎src/compiler/emitter.ts
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+46-9Lines changed: 46 additions & 9 deletions
diff --git a/‎src/compiler/program.ts
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+2-45Lines changed: 2 additions & 45 deletions b/‎src/compiler/program.ts
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+2-45Lines changed: 2 additions & 45 deletions
@@ -25,6 +25,11 @@ namespace ts {
          */
         /*@internal*/
         storeFilesChangingSignatureDuringEmit?: boolean;
+        /**
+         * Gets the current time
+         */
+        /*@internal*/
+        now?(): Date;
     }
 
     /**
@@ -34,9 +39,9 @@ namespace ts {
         /*@internal*/
         getState(): ReusableBuilderProgramState;
         /*@internal*/
-        backupState(): void;
+        saveEmitState(): SavedBuildProgramEmitState;
         /*@internal*/
-        restoreState(): void;
+        restoreEmitState(saved: SavedBuildProgramEmitState): void;
         /**
          * Returns current program
          */
 
@@ -10,5 +10,6 @@ namespace ts {
         name: string;
         writeByteOrderMark: boolean;
         text: string;
+        /* @internal */ buildInfo?: BuildInfo
     }
 }
@@ -5140,11 +5140,11 @@
         "category": "Error",
         "code": 6310
     },
-    "Project '{0}' is out of date because oldest output '{1}' is older than newest input '{2}'": {
+    "Project '{0}' is out of date because output '{1}' is older than input '{2}'": {
         "category": "Message",
         "code": 6350
     },
-    "Project '{0}' is up to date because newest input '{1}' is older than oldest output '{2}'": {
+    "Project '{0}' is up to date because newest input '{1}' is older than output '{2}'": {
         "category": "Message",
         "code": 6351
     },
@@ -5322,6 +5322,14 @@
         "category": "Message",
         "code": 6398
     },
+    "Project '{0}' is out of date because buildinfo file '{1}' indicates that some of the changes were not emitted": {
+        "category": "Message",
+        "code": 6399
+    },
+    "Project '{0}' is up to date but needs to update timestamps of output files that are older than input files": {
+        "category": "Message",
+        "code": 6400
+    },
 
     "The expected type comes from property '{0}' which is declared here on type '{1}'": {
         "category": "Message",
 
@@ -366,7 +366,9 @@ namespace ts {
                 return;
             }
             const version = ts.version; // Extracted into a const so the form is stable between namespace and module
-            writeFile(host, emitterDiagnostics, buildInfoPath, getBuildInfoText({ bundle, program, version }), /*writeByteOrderMark*/ false);
+            const buildInfo: BuildInfo = { bundle, program, version };
+            // Pass buildinfo as additional data to avoid having to reparse
+            writeFile(host, emitterDiagnostics, buildInfoPath, getBuildInfoText(buildInfo), /*writeByteOrderMark*/ false, /*sourceFiles*/ undefined, { buildInfo });
         }
 
         function emitJsFileOrBundle(
@@ -557,14 +559,19 @@ namespace ts {
                 if (sourceMapFilePath) {
                     const sourceMap = sourceMapGenerator.toString();
                     writeFile(host, emitterDiagnostics, sourceMapFilePath, sourceMap, /*writeByteOrderMark*/ false, sourceFiles);
+                    if (printer.bundleFileInfo) printer.bundleFileInfo.mapHash = BuilderState.computeSignature(sourceMap, maybeBind(host, host.createHash));
                 }
             }
             else {
                 writer.writeLine();
             }
 
             // Write the output file
-            writeFile(host, emitterDiagnostics, jsFilePath, writer.getText(), !!compilerOptions.emitBOM, sourceFiles, { sourceMapUrlPos });
+            const text = writer.getText();
+            writeFile(host, emitterDiagnostics, jsFilePath, text, !!compilerOptions.emitBOM, sourceFiles, { sourceMapUrlPos });
+            // We store the hash of the text written in the buildinfo to ensure that text of the referenced d.ts file is same as whats in the buildinfo
+            // This is needed because incremental can be toggled between two runs and we might use stale file text to do text manipulation in prepend mode
+            if (printer.bundleFileInfo) printer.bundleFileInfo.hash = BuilderState.computeSignature(text, maybeBind(host, host.createHash));
 
             // Reset state
             writer.clear();
@@ -709,6 +716,9 @@ namespace ts {
         getCanonicalFileName(fileName: string): string;
         useCaseSensitiveFileNames(): boolean;
         getNewLine(): string;
+        createHash?(data: string): string;
+        now?(): Date;
+        getBuildInfo?(fileName: string, configFilePath: string | undefined): BuildInfo | undefined;
     }
 
     function createSourceFilesFromBundleBuildInfo(bundle: BundleBuildInfo, buildInfoDirectory: string, host: EmitUsingBuildInfoHost): readonly SourceFile[] {
@@ -745,23 +755,40 @@ namespace ts {
         getCommandLine: (ref: ProjectReference) => ParsedCommandLine | undefined,
         customTransformers?: CustomTransformers
     ): EmitUsingBuildInfoResult {
+        const createHash = maybeBind(host, host.createHash);
         const { buildInfoPath, jsFilePath, sourceMapFilePath, declarationFilePath, declarationMapPath } = getOutputPathsForBundle(config.options, /*forceDtsPaths*/ false);
-        const buildInfoText = host.readFile(Debug.checkDefined(buildInfoPath));
-        if (!buildInfoText) return buildInfoPath!;
+        let buildInfo: BuildInfo;
+        if (host.getBuildInfo) {
+            // If host directly provides buildinfo we can get it directly. This allows host to cache the buildinfo
+            const hostBuildInfo = host.getBuildInfo(buildInfoPath!, config.options.configFilePath);
+            if (!hostBuildInfo) return buildInfoPath!;
+            buildInfo = hostBuildInfo;
+        }
+        else {
+            const buildInfoText = host.readFile(buildInfoPath!);
+            if (!buildInfoText) return buildInfoPath!;
+            buildInfo = getBuildInfo(buildInfoText);
+        }
+        if (!buildInfo.bundle || !buildInfo.bundle.js || (declarationFilePath && !buildInfo.bundle.dts)) return buildInfoPath!;
+
         const jsFileText = host.readFile(Debug.checkDefined(jsFilePath));
         if (!jsFileText) return jsFilePath!;
+        // If the jsFileText is not same has what it was created with, tsbuildinfo is stale so dont use it
+        if (BuilderState.computeSignature(jsFileText, createHash) !== buildInfo.bundle.js.hash) return jsFilePath!;
         const sourceMapText = sourceMapFilePath && host.readFile(sourceMapFilePath);
         // error if no source map or for now if inline sourcemap
         if ((sourceMapFilePath && !sourceMapText) || config.options.inlineSourceMap) return sourceMapFilePath || "inline sourcemap decoding";
+        if (sourceMapFilePath && BuilderState.computeSignature(sourceMapText!, createHash) !== buildInfo.bundle.js.mapHash) return sourceMapFilePath;
+
         // read declaration text
         const declarationText = declarationFilePath && host.readFile(declarationFilePath);
         if (declarationFilePath && !declarationText) return declarationFilePath;
+        if (declarationFilePath && BuilderState.computeSignature(declarationText!, createHash) !== buildInfo.bundle.dts!.hash) return declarationFilePath;
         const declarationMapText = declarationMapPath && host.readFile(declarationMapPath);
         // error if no source map or for now if inline sourcemap
         if ((declarationMapPath && !declarationMapText) || config.options.inlineSourceMap) return declarationMapPath || "inline sourcemap decoding";
+        if (declarationMapPath && BuilderState.computeSignature(declarationMapText!, createHash) !== buildInfo.bundle.dts!.mapHash) return declarationMapPath;
 
-        const buildInfo = getBuildInfo(buildInfoText);
-        if (!buildInfo.bundle || !buildInfo.bundle.js || (declarationText && !buildInfo.bundle.dts)) return buildInfoPath!;
         const buildInfoDirectory = getDirectoryPath(getNormalizedAbsolutePath(buildInfoPath!, host.getCurrentDirectory()));
         const ownPrependInput = createInputFiles(
             jsFileText,
@@ -779,6 +806,8 @@ namespace ts {
         const outputFiles: OutputFile[] = [];
         const prependNodes = createPrependNodes(config.projectReferences, getCommandLine, f => host.readFile(f));
         const sourceFilesForJsEmit = createSourceFilesFromBundleBuildInfo(buildInfo.bundle, buildInfoDirectory, host);
+        let changedDtsText: string | undefined;
+        let changedDtsData: WriteFileCallbackData | undefined;
         const emitHost: EmitHost = {
             getPrependNodes: memoize(() => [...prependNodes, ownPrependInput]),
             getCanonicalFileName: host.getCanonicalFileName,
@@ -794,7 +823,7 @@ namespace ts {
             getResolvedProjectReferenceToRedirect: returnUndefined,
             getProjectReferenceRedirect: returnUndefined,
             isSourceOfProjectReferenceRedirect: returnFalse,
-            writeFile: (name, text, writeByteOrderMark) => {
+            writeFile: (name, text, writeByteOrderMark, _onError, _sourceFiles, data) => {
                 switch (name) {
                     case jsFilePath:
                         if (jsFileText === text) return;
@@ -803,19 +832,26 @@ namespace ts {
                         if (sourceMapText === text) return;
                         break;
                     case buildInfoPath:
-                        const newBuildInfo = getBuildInfo(text);
+                        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, changedDtsData, createHash);
+                            newBuildInfo.program.dtsChangeTime = getCurrentTime(host).getTime();
+                        }
                         // 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 });
+                        outputFiles.push({ name, text: getBuildInfoText(newBuildInfo), writeByteOrderMark, buildInfo: newBuildInfo });
                         return;
                     case declarationFilePath:
                         if (declarationText === text) return;
+                        changedDtsText = text;
+                        changedDtsData = data;
                         break;
                     case declarationMapPath:
                         if (declarationMapText === text) return;
@@ -833,6 +869,7 @@ namespace ts {
             getSourceFileFromReference: returnUndefined,
             redirectTargetsMap: createMultiMap(),
             getFileIncludeReasons: notImplemented,
+            createHash,
         };
         emitFiles(
             notImplementedResolver,
 
@@ -58,22 +58,14 @@ namespace ts {
         return getPathFromPathComponents(commonPathComponents);
     }
 
-    interface OutputFingerprint {
-        hash: string;
-        byteOrderMark: boolean;
-        mtime: Date;
-    }
-
     export function createCompilerHost(options: CompilerOptions, setParentNodes?: boolean): CompilerHost {
         return createCompilerHostWorker(options, setParentNodes);
     }
 
     /*@internal*/
-    // TODO(shkamat): update this after reworking ts build API
     export function createCompilerHostWorker(options: CompilerOptions, setParentNodes?: boolean, system = sys): CompilerHost {
         const existingDirectories = new Map<string, boolean>();
         const getCanonicalFileName = createGetCanonicalFileName(system.useCaseSensitiveFileNames);
-        const computeHash = maybeBind(system, system.createHash) || generateDjb2Hash;
         function getSourceFile(fileName: string, languageVersionOrOptions: ScriptTarget | CreateSourceFileOptions, onError?: (message: string) => void): SourceFile | undefined {
             let text: string | undefined;
             try {
@@ -113,7 +105,7 @@ namespace ts {
                     fileName,
                     data,
                     writeByteOrderMark,
-                    (path, data, writeByteOrderMark) => writeFileWorker(path, data, writeByteOrderMark),
+                    (path, data, writeByteOrderMark) => system.writeFile(path, data, writeByteOrderMark),
                     path => (compilerHost.createDirectory || system.createDirectory)(path),
                     path => directoryExists(path));
 
@@ -127,42 +119,6 @@ namespace ts {
             }
         }
 
-        let outputFingerprints: ESMap<string, OutputFingerprint>;
-        function writeFileWorker(fileName: string, data: string, writeByteOrderMark: boolean) {
-            if (!isWatchSet(options) || !system.getModifiedTime) {
-                system.writeFile(fileName, data, writeByteOrderMark);
-                return;
-            }
-
-            if (!outputFingerprints) {
-                outputFingerprints = new Map<string, OutputFingerprint>();
-            }
-
-            const hash = computeHash(data);
-            const mtimeBefore = system.getModifiedTime(fileName);
-
-            if (mtimeBefore) {
-                const fingerprint = outputFingerprints.get(fileName);
-                // If output has not been changed, and the file has no external modification
-                if (fingerprint &&
-                    fingerprint.byteOrderMark === writeByteOrderMark &&
-                    fingerprint.hash === hash &&
-                    fingerprint.mtime.getTime() === mtimeBefore.getTime()) {
-                    return;
-                }
-            }
-
-            system.writeFile(fileName, data, writeByteOrderMark);
-
-            const mtimeAfter = system.getModifiedTime(fileName) || missingFileModifiedTime;
-
-            outputFingerprints.set(fileName, {
-                hash,
-                byteOrderMark: writeByteOrderMark,
-                mtime: mtimeAfter
-            });
-        }
-
         function getDefaultLibLocation(): string {
             return getDirectoryPath(normalizePath(system.getExecutingFilePath()));
         }
@@ -1973,6 +1929,7 @@ namespace ts {
                 getSourceFileFromReference: (file, ref) => program.getSourceFileFromReference(file, ref),
                 redirectTargetsMap,
                 getFileIncludeReasons: program.getFileIncludeReasons,
+                createHash: maybeBind(host, host.createHash),
             };
         }
Original file line number	Diff line number	Diff line change
`@@ -10,5 +10,6 @@ namespace ts {`
`10`	`10`	`name: string;`
`11`	`11`	`writeByteOrderMark: boolean;`
`12`	`12`	`text: string;`
	`13`	`+ /* @internal */ buildInfo?: BuildInfo`
`13`	`14`	`}`
`14`	`15`	`}`