Merge pull request microsoft#30524 from Microsoft/moduleResolutionError

Report output file not built error for any module resolution that ends up to source file

Author: sheetalkamat

src/compiler/checker.ts

@@ -2352,19 +2352,12 @@ namespace ts {
             }
 
             if (moduleNotFoundError) {
-                // For relative paths, see if this was possibly a projectReference redirect
-                if (pathIsRelative(moduleReference)) {
-                    const sourceFile = getSourceFileOfNode(location);
-                    const redirects = sourceFile.redirectedReferences;
-                    if (redirects) {
-                        const normalizedTargetPath = getNormalizedAbsolutePath(moduleReference, getDirectoryPath(sourceFile.fileName));
-                        for (const ext of [Extension.Ts, Extension.Tsx]) {
-                            const probePath = normalizedTargetPath + ext;
-                            if (redirects.indexOf(probePath) >= 0) {
-                                error(errorNode, Diagnostics.Output_file_0_has_not_been_built_from_source_file_1, moduleReference, probePath);
-                                return undefined;
-                            }
-                        }
+                // See if this was possibly a projectReference redirect
+                if (resolvedModule) {
+                    const redirect = host.getProjectReferenceRedirect(resolvedModule.resolvedFileName);
+                    if (redirect) {
+                        error(errorNode, Diagnostics.Output_file_0_has_not_been_built_from_source_file_1, redirect, resolvedModule.resolvedFileName);
+                        return undefined;
                     }
                 }
 

src/compiler/program.ts

@@ -2268,7 +2268,6 @@ namespace ts {
             if (refFile) {
                 const redirect = getProjectReferenceRedirect(fileName);
                 if (redirect) {
-                    ((refFile.redirectedReferences || (refFile.redirectedReferences = [])) as string[]).push(fileName);
                     fileName = redirect;
                     // Once we start redirecting to a file, we can potentially come back to it
                     // via a back-reference from another file in the .d.ts folder. If that happens we'll

src/compiler/types.ts

@@ -2740,12 +2740,6 @@ namespace ts {
         /* @internal */ resolvedModules?: Map<ResolvedModuleFull | undefined>;
         /* @internal */ resolvedTypeReferenceDirectiveNames: Map<ResolvedTypeReferenceDirective | undefined>;
         /* @internal */ imports: ReadonlyArray<StringLiteralLike>;
-        /**
-         * When a file's references are redirected due to project reference directives,
-         * the original names of the references are stored in this array
-         */
-        /* @internal*/
-        redirectedReferences?: ReadonlyArray<string>;
         // Identifier only if `declare global`
         /* @internal */ moduleAugmentations: ReadonlyArray<StringLiteral | Identifier>;
         /* @internal */ patternAmbientModules?: PatternAmbientModule[];
@@ -3074,6 +3068,7 @@ namespace ts {
         getSourceFiles(): ReadonlyArray<SourceFile>;
         getSourceFile(fileName: string): SourceFile | undefined;
         getResolvedTypeReferenceDirectives(): ReadonlyMap<ResolvedTypeReferenceDirective | undefined>;
+        getProjectReferenceRedirect(fileName: string): string | undefined;
 
         readonly redirectTargetsMap: RedirectTargetsMap;
     }

src/testRunner/unittests/config/projectReferences.ts

@@ -284,6 +284,28 @@ namespace ts {
                 assertHasError("Issues a useful error", program.getSemanticDiagnostics(), Diagnostics.Output_file_0_has_not_been_built_from_source_file_1);
             });
         });
+
+        it("issues a nice error when the input file is missing when module reference is not relative", () => {
+            const spec: TestSpecification = {
+                "/alpha": {
+                    files: { "/alpha/a.ts": "export const m: number = 3;" },
+                    references: []
+                },
+                "/beta": {
+                    files: { "/beta/b.ts": "import { m } from '@alpha/a'" },
+                    references: ["../alpha"],
+                    options: {
+                        baseUrl: "./",
+                        paths: {
+                            "@alpha/*": ["/alpha/*"]
+                        }
+                    }
+                }
+            };
+            testProjectReferences(spec, "/beta/tsconfig.json", program => {
+                assertHasError("Issues a useful error", program.getSemanticDiagnostics(), Diagnostics.Output_file_0_has_not_been_built_from_source_file_1);
+            });
+        });
     });
 
     /**