Emit build info even on noEmitOnError or tsc --build (#38853)

* Emit buildinfo when there are errors with noEmitOnError?
TODO: --build mode

* Always emit tsbuild info even if there are non syntax errors in tsc --build mode

* Sort affectedFilesPendingEmit for consistent build info text

Author: sheetalkamat

src/compiler/builder.ts

@@ -148,7 +148,7 @@ namespace ts {
         /**
          * true if build info is emitted
          */
-        emittedBuildInfo?: boolean;
+        buildInfoEmitPending: boolean;
         /**
          * Already seen emitted files
          */
@@ -250,14 +250,14 @@ namespace ts {
             BuilderState.getAllFilesExcludingDefaultLibraryFile(state, newProgram, /*firstSourceFile*/ undefined)
                 .forEach(file => state.changedFilesSet.set(file.resolvedPath, true));
         }
-        else if (oldCompilerOptions && compilerOptionsAffectEmit(compilerOptions, oldCompilerOptions)) {
+        else if (oldCompilerOptions && !outFile(compilerOptions) && compilerOptionsAffectEmit(compilerOptions, oldCompilerOptions)) {
             // Add all files to affectedFilesPendingEmit since emit changed
             newProgram.getSourceFiles().forEach(f => addToAffectedFilesPendingEmit(state, f.resolvedPath, BuilderFileEmit.Full));
             Debug.assert(!state.seenAffectedFiles || !state.seenAffectedFiles.size);
             state.seenAffectedFiles = state.seenAffectedFiles || createMap<true>();
         }
 
-        state.emittedBuildInfo = !state.changedFilesSet.size && !state.affectedFilesPendingEmit;
+        state.buildInfoEmitPending = !!state.changedFilesSet.size;
         return state;
     }
 
@@ -611,7 +611,7 @@ namespace ts {
         isBuildInfoEmit?: boolean
     ) {
         if (isBuildInfoEmit) {
-            state.emittedBuildInfo = true;
+            state.buildInfoEmitPending = false;
         }
         else if (affected === state.program) {
             state.changedFilesSet.clear();
@@ -624,6 +624,7 @@ namespace ts {
             }
             if (isPendingEmit) {
                 state.affectedFilesPendingEmitIndex!++;
+                state.buildInfoEmitPending = true;
             }
             else {
                 state.affectedFilesIndex!++;
@@ -688,12 +689,14 @@ namespace ts {
     }
 
     export type ProgramBuildInfoDiagnostic = string | [string, readonly ReusableDiagnostic[]];
+    export type ProgramBuilderInfoFilePendingEmit = [string, BuilderFileEmit];
     export interface ProgramBuildInfo {
         fileInfos: MapLike<BuilderState.FileInfo>;
         options: CompilerOptions;
         referencedMap?: MapLike<string[]>;
         exportedModulesMap?: MapLike<string[]>;
         semanticDiagnosticsPerFile?: ProgramBuildInfoDiagnostic[];
+        affectedFilesPendingEmit?: ProgramBuilderInfoFilePendingEmit[];
     }
 
     /**
@@ -751,6 +754,17 @@ namespace ts {
             result.semanticDiagnosticsPerFile = semanticDiagnosticsPerFile;
         }
 
+        if (state.affectedFilesPendingEmit) {
+            const affectedFilesPendingEmit: ProgramBuilderInfoFilePendingEmit[] = [];
+            const seenFiles = createMap<true>();
+            for (const path of state.affectedFilesPendingEmit.slice(state.affectedFilesPendingEmitIndex).sort(compareStringsCaseSensitive)) {
+                if (addToSeen(seenFiles, path)) {
+                    affectedFilesPendingEmit.push([relativeToBuildInfo(path), state.affectedFilesPendingEmitKind!.get(path)!]);
+                }
+            }
+            result.affectedFilesPendingEmit = affectedFilesPendingEmit;
+        }
+
         return result;
 
         function relativeToBuildInfoEnsuringAbsolutePath(path: string) {
@@ -916,13 +930,23 @@ namespace ts {
         else if (kind === BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram) {
             (builderProgram as EmitAndSemanticDiagnosticsBuilderProgram).getSemanticDiagnosticsOfNextAffectedFile = getSemanticDiagnosticsOfNextAffectedFile;
             (builderProgram as EmitAndSemanticDiagnosticsBuilderProgram).emitNextAffectedFile = emitNextAffectedFile;
+            builderProgram.emitBuildInfo = emitBuildInfo;
         }
         else {
             notImplemented();
         }
 
         return builderProgram;
 
+        function emitBuildInfo(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken): EmitResult {
+            if (state.buildInfoEmitPending) {
+                const result = Debug.checkDefined(state.program).emitBuildInfo(writeFile || maybeBind(host, host.writeFile), cancellationToken);
+                state.buildInfoEmitPending = false;
+                return result;
+            }
+            return emitSkippedWithNoDiagnostics;
+        }
+
         /**
          * Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete
          * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host
@@ -936,7 +960,7 @@ namespace ts {
                 if (!outFile(state.compilerOptions)) {
                     const pendingAffectedFile = getNextAffectedFilePendingEmit(state);
                     if (!pendingAffectedFile) {
-                        if (state.emittedBuildInfo) {
+                        if (!state.buildInfoEmitPending) {
                             return undefined;
                         }
 
@@ -993,7 +1017,7 @@ namespace ts {
         function emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult {
             if (kind === BuilderProgramKind.EmitAndSemanticDiagnosticsBuilderProgram) {
                 assertSourceFileOkWithoutNextAffectedCall(state, targetSourceFile);
-                const result = handleNoEmitOptions(builderProgram, targetSourceFile, cancellationToken);
+                const result = handleNoEmitOptions(builderProgram, targetSourceFile, writeFile, cancellationToken);
                 if (result) return result;
                 if (!targetSourceFile) {
                     // Emit and report any errors we ran into.
@@ -1142,7 +1166,10 @@ namespace ts {
             referencedMap: getMapOfReferencedSet(program.referencedMap, toPath),
             exportedModulesMap: getMapOfReferencedSet(program.exportedModulesMap, toPath),
             semanticDiagnosticsPerFile: program.semanticDiagnosticsPerFile && arrayToMap(program.semanticDiagnosticsPerFile, value => toPath(isString(value) ? value : value[0]), value => isString(value) ? emptyArray : value[1]),
-            hasReusableDiagnostic: true
+            hasReusableDiagnostic: true,
+            affectedFilesPendingEmit: map(program.affectedFilesPendingEmit, value => toPath(value[0])),
+            affectedFilesPendingEmitKind: program.affectedFilesPendingEmit && arrayToMap(program.affectedFilesPendingEmit, value => toPath(value[0]), value => value[1]),
+            affectedFilesPendingEmitIndex: program.affectedFilesPendingEmit && 0,
         };
         return {
             getState: () => state,
@@ -1165,6 +1192,7 @@ namespace ts {
             getCurrentDirectory: notImplemented,
             emitNextAffectedFile: notImplemented,
             getSemanticDiagnosticsOfNextAffectedFile: notImplemented,
+            emitBuildInfo: notImplemented,
             close: noop,
         };
 
@@ -1195,6 +1223,7 @@ namespace ts {
             getDeclarationDiagnostics: (sourceFile, cancellationToken) => getProgram().getDeclarationDiagnostics(sourceFile, cancellationToken),
             getSemanticDiagnostics: (sourceFile, cancellationToken) => getProgram().getSemanticDiagnostics(sourceFile, cancellationToken),
             emit: (sourceFile, writeFile, cancellationToken, emitOnlyDts, customTransformers) => getProgram().emit(sourceFile, writeFile, cancellationToken, emitOnlyDts, customTransformers),
+            emitBuildInfo: (writeFile, cancellationToken) => getProgram().emitBuildInfo(writeFile, cancellationToken),
             getAllDependencies: notImplemented,
             getCurrentDirectory: () => getProgram().getCurrentDirectory(),
             close: noop,

src/compiler/builderPublic.ts

@@ -99,6 +99,8 @@ namespace ts {
          * in that order would be used to write the files
          */
         emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;
+        /*@internal*/
+        emitBuildInfo(writeFile?: WriteFileCallback, cancellationToken?: CancellationToken): EmitResult;
         /**
          * Get the current directory of the program
          */

src/compiler/program.ts

@@ -1585,7 +1585,7 @@ namespace ts {
 
         function emitWorker(program: Program, sourceFile: SourceFile | undefined, writeFileCallback: WriteFileCallback | undefined, cancellationToken: CancellationToken | undefined, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers, forceDtsEmit?: boolean): EmitResult {
             if (!forceDtsEmit) {
-                const result = handleNoEmitOptions(program, sourceFile, cancellationToken);
+                const result = handleNoEmitOptions(program, sourceFile, writeFileCallback, cancellationToken);
                 if (result) return result;
             }
 
@@ -3638,11 +3638,17 @@ namespace ts {
     }
 
     /*@internal*/
-    export function handleNoEmitOptions(program: ProgramToEmitFilesAndReportErrors, sourceFile: SourceFile | undefined, cancellationToken: CancellationToken | undefined): EmitResult | undefined {
+    export const emitSkippedWithNoDiagnostics: EmitResult = { diagnostics: emptyArray, sourceMaps: undefined, emittedFiles: undefined, emitSkipped: true };
+
+    /*@internal*/
+    export function handleNoEmitOptions(
+        program: ProgramToEmitFilesAndReportErrors,
+        sourceFile: SourceFile | undefined,
+        writeFile: WriteFileCallback | undefined,
+        cancellationToken: CancellationToken | undefined
+    ): EmitResult | undefined {
         const options = program.getCompilerOptions();
-        if (options.noEmit) {
-            return { diagnostics: emptyArray, sourceMaps: undefined, emittedFiles: undefined, emitSkipped: true };
-        }
+        if (options.noEmit) return emitSkippedWithNoDiagnostics;
 
         // If the noEmitOnError flag is set, then check if we have any errors so far.  If so,
         // immediately bail out.  Note that we pass 'undefined' for 'sourceFile' so that we
@@ -3659,9 +3665,14 @@ namespace ts {
             diagnostics = program.getDeclarationDiagnostics(/*sourceFile*/ undefined, cancellationToken);
         }
 
-        return diagnostics.length > 0 ?
-            { diagnostics, sourceMaps: undefined, emittedFiles: undefined, emitSkipped: true } :
-            undefined;
+        if (!diagnostics.length) return undefined;
+        let emittedFiles: string[] | undefined;
+        if (!sourceFile && !outFile(options)) {
+            const emitResult = program.emitBuildInfo(writeFile, cancellationToken);
+            if (emitResult.diagnostics) diagnostics = [...diagnostics, ...emitResult.diagnostics];
+            emittedFiles = emitResult.emittedFiles;
+        }
+        return { diagnostics, sourceMaps: undefined, emittedFiles, emitSkipped: true };
     }
 
     /*@internal*/