Code review feedback

Author: sheetalkamat

src/compiler/builder.ts

@@ -406,14 +406,13 @@ namespace ts {
     }
 
     /**
-     *  Handles sematic diagnostics and dts emit for affectedFile and files, that are referencing modules that export entities from affected file
+     *  Handles semantic diagnostics and dts emit for affectedFile and files, that are referencing modules that export entities from affected file
      *  This is because even though js emit doesnt change, dts emit / type used can change resulting in need for dts emit and js change
-     *  Similar to cleanSemanticDiagnosticsOfAffectedFile
      */
     function handleDtsMayChangeOfAffectedFile(state: BuilderProgramState, affectedFile: SourceFile, cancellationToken: CancellationToken | undefined, computeHash: BuilderState.ComputeHash) {
         removeSemanticDiagnosticsOf(state, affectedFile.path);
 
-        // If affected files is everything except default librarry, then nothing more to do
+        // If affected files is everything except default library, then nothing more to do
         if (state.allFilesExcludingDefaultLibraryFile === state.affectedFiles) {
             if (!state.cleanedDiagnosticsOfLibFiles) {
                 state.cleanedDiagnosticsOfLibFiles = true;
@@ -442,7 +441,19 @@ namespace ts {
             const program = Debug.assertDefined(state.program);
             const sourceFile = program.getSourceFileByPath(path);
             if (sourceFile) {
-                BuilderState.updateShapeSignature(state, program, sourceFile, Debug.assertDefined(state.currentAffectedFilesSignatures), cancellationToken, computeHash, state.currentAffectedFilesExportedModulesMap);
+                // Even though the js emit doesnt change and we are already handling dts emit and semantic diagnostics
+                // we need to update the signature to reflect correctness of the signature(which is output d.ts emit) of this file
+                // This ensures that we dont later during incremental builds considering wrong signature.
+                // Eg where this also is needed to ensure that .tsbuildinfo generated by incremental build should be same as if it was first fresh build
+                BuilderState.updateShapeSignature(
+                    state,
+                    program,
+                    sourceFile,
+                    Debug.assertDefined(state.currentAffectedFilesSignatures),
+                    cancellationToken,
+                    computeHash,
+                    state.currentAffectedFilesExportedModulesMap
+                );
                 // If not dts emit, nothing more to do
                 if (getEmitDeclarations(state.compilerOptions)) {
                     addToAffectedFilesPendingEmit(state, [path]);

src/testRunner/tsconfig.json

@@ -92,7 +92,7 @@
         "unittests/tsbuild/amdModulesWithOut.ts",
         "unittests/tsbuild/emptyFiles.ts",
         "unittests/tsbuild/graphOrdering.ts",
-        "unittests/tsbuild//inferredTypeFromTransitiveModule.ts",
+        "unittests/tsbuild/inferredTypeFromTransitiveModule.ts",
         "unittests/tsbuild/missingExtendedFile.ts",
         "unittests/tsbuild/outFile.ts",
         "unittests/tsbuild/referencesWithRootDirInParent.ts",