Make hasInvalidatedResolution non internal for program and add it watchApi (#50776)

* Make stub for hasInvalidatedResolution

* Wire through hasInvalidatedResolutions
Fixes #48057

* Update comment

* Feedback

src/compiler/resolutionCache.ts

@@ -14,7 +14,7 @@ namespace ts {
         removeResolutionsOfFile(filePath: Path): void;
         removeResolutionsFromProjectReferenceRedirects(filePath: Path): void;
         setFilesWithInvalidatedNonRelativeUnresolvedImports(filesWithUnresolvedImports: ESMap<Path, readonly string[]>): void;
-        createHasInvalidatedResolution(forceAllFilesAsInvalidated?: boolean): HasInvalidatedResolution;
+        createHasInvalidatedResolution(customHasInvalidatedResolution: HasInvalidatedResolution): HasInvalidatedResolution;
         hasChangedAutomaticTypeDirectiveNames(): boolean;
         isFileWithInvalidatedNonRelativeUnresolvedImports(path: Path): boolean;
 
@@ -300,17 +300,13 @@ namespace ts {
             return !!value && !!value.length;
         }
 
-        function createHasInvalidatedResolution(forceAllFilesAsInvalidated?: boolean): HasInvalidatedResolution {
+        function createHasInvalidatedResolution(customHasInvalidatedResolution: HasInvalidatedResolution): HasInvalidatedResolution {
             // Ensure pending resolutions are applied
             invalidateResolutionsOfFailedLookupLocations();
-            if (forceAllFilesAsInvalidated) {
-                // Any file asked would have invalidated resolution
-                filesWithInvalidatedResolutions = undefined;
-                return returnTrue;
-            }
             const collected = filesWithInvalidatedResolutions;
             filesWithInvalidatedResolutions = undefined;
-            return path => (!!collected && collected.has(path)) ||
+            return path => customHasInvalidatedResolution(path) ||
+                !!collected?.has(path) ||
                 isFileWithInvalidatedNonRelativeUnresolvedImports(path);
         }
 

src/compiler/types.ts

@@ -7215,7 +7215,8 @@ namespace ts {
         getEnvironmentVariable?(name: string): string | undefined;
         /* @internal */ onReleaseOldSourceFile?(oldSourceFile: SourceFile, oldOptions: CompilerOptions, hasSourceFileByPath: boolean): void;
         /* @internal */ onReleaseParsedCommandLine?(configFileName: string, oldResolvedRef: ResolvedProjectReference | undefined, optionOptions: CompilerOptions): void;
-        /* @internal */ hasInvalidatedResolution?: HasInvalidatedResolution;
+        /** If provided along with custom resolveModuleNames or resolveTypeReferenceDirectives, used to determine if unchanged file path needs to re-resolve modules/type reference directives */
+        hasInvalidatedResolution?(filePath: Path): boolean;
         /* @internal */ hasChangedAutomaticTypeDirectiveNames?: HasChangedAutomaticTypeDirectiveNames;
         createHash?(data: string): string;
         getParsedCommandLine?(fileName: string): ParsedCommandLine | undefined;

src/compiler/watchPublic.ts

@@ -112,6 +112,8 @@ namespace ts {
         resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingSourceFile?: SourceFile): (ResolvedModule | undefined)[];
         /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[] | readonly FileReference[], containingFile: string, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingFileMode?: SourceFile["impliedNodeFormat"] | undefined): (ResolvedTypeReferenceDirective | undefined)[];
+        /** If provided along with custom resolveModuleNames or resolveTypeReferenceDirectives, used to determine if unchanged file path needs to re-resolve modules/type reference directives */
+        hasInvalidatedResolution?(filePath: Path): boolean;
         /**
          * Returns the module resolution cache used by a provided `resolveModuleNames` implementation so that any non-name module resolution operations (eg, package.json lookup) can reuse it
          */
@@ -371,6 +373,10 @@ namespace ts {
             maybeBind(host, host.getModuleResolutionCache) :
             (() => resolutionCache.getModuleResolutionCache());
         const userProvidedResolution = !!host.resolveModuleNames || !!host.resolveTypeReferenceDirectives;
+        // All resolutions are invalid if user provided resolutions and didnt supply hasInvalidatedResolution
+        const customHasInvalidatedResolution = userProvidedResolution ?
+            maybeBind(host, host.hasInvalidatedResolution) || returnTrue :
+            returnFalse;
 
         builderProgram = readBuilderProgram(compilerOptions, compilerHost) as any as T;
         synchronizeProgram();
@@ -443,8 +449,7 @@ namespace ts {
                 }
             }
 
-            // All resolutions are invalid if user provided resolutions
-            const hasInvalidatedResolution = resolutionCache.createHasInvalidatedResolution(userProvidedResolution);
+            const hasInvalidatedResolution = resolutionCache.createHasInvalidatedResolution(customHasInvalidatedResolution);
             const {
                 originalReadFile, originalFileExists, originalDirectoryExists,
                 originalCreateDirectory, originalWriteFile,

src/server/project.ts

@@ -1176,7 +1176,7 @@ namespace ts.server {
             Debug.assert(!this.isClosed(), "Called update graph worker of closed project");
             this.writeLog(`Starting updateGraphWorker: Project: ${this.getProjectName()}`);
             const start = timestamp();
-            this.hasInvalidatedResolution = this.resolutionCache.createHasInvalidatedResolution();
+            this.hasInvalidatedResolution = this.resolutionCache.createHasInvalidatedResolution(returnFalse);
             this.resolutionCache.startCachingPerDirectoryResolution();
             this.program = this.languageService.getProgram(); // TODO: GH#18217
             this.dirty = false;

src/testRunner/unittests/tscWatch/watchApi.ts

@@ -1,23 +1,22 @@
 namespace ts.tscWatch {
     describe("unittests:: tsc-watch:: watchAPI:: tsc-watch with custom module resolution", () => {
-        const configFileJson: any = {
-            compilerOptions: { module: "commonjs", resolveJsonModule: true },
-            files: ["index.ts"]
-        };
-        const mainFile: File = {
-            path: `${projectRoot}/index.ts`,
-            content: "import settings from './settings.json';"
-        };
-        const config: File = {
-            path: `${projectRoot}/tsconfig.json`,
-            content: JSON.stringify(configFileJson)
-        };
-        const settingsJson: File = {
-            path: `${projectRoot}/settings.json`,
-            content: JSON.stringify({ content: "Print this" })
-        };
-
         it("verify that module resolution with json extension works when returned without extension", () => {
+            const configFileJson: any = {
+                compilerOptions: { module: "commonjs", resolveJsonModule: true },
+                files: ["index.ts"]
+            };
+            const mainFile: File = {
+                path: `${projectRoot}/index.ts`,
+                content: "import settings from './settings.json';"
+            };
+            const config: File = {
+                path: `${projectRoot}/tsconfig.json`,
+                content: JSON.stringify(configFileJson)
+            };
+            const settingsJson: File = {
+                path: `${projectRoot}/settings.json`,
+                content: JSON.stringify({ content: "Print this" })
+            };
             const { sys, baseline, oldSnap, cb, getPrograms } = createBaseline(createWatchedSystem(
                 [libFile, mainFile, config, settingsJson],
                 { currentDirectory: projectRoot }),
@@ -50,6 +49,64 @@ namespace ts.tscWatch {
                 watchOrSolution: watch
             });
         });
+
+        describe("hasInvalidatedResolution", () => {
+            function verifyWatch(subScenario: string, implementHasInvalidatedResolution: boolean) {
+                it(subScenario, () => {
+                    const { sys, baseline, oldSnap, cb, getPrograms } = createBaseline(createWatchedSystem({
+                        [`${projectRoot}/tsconfig.json`]: JSON.stringify({
+                            compilerOptions: { traceResolution: true, extendedDiagnostics: true },
+                            files: ["main.ts"]
+                        }),
+                        [`${projectRoot}/main.ts`]: `import { foo } from "./other";`,
+                        [`${projectRoot}/other.d.ts`]: "export function foo(): void;",
+                        [libFile.path]: libFile.content,
+                    }, { currentDirectory: projectRoot }));
+                    const host = createWatchCompilerHostOfConfigFileForBaseline({
+                        configFileName: `${projectRoot}/tsconfig.json`,
+                        system: sys,
+                        cb,
+                    });
+                    host.resolveModuleNames = (moduleNames, containingFile, _reusedNames, _redirectedReference, options) =>
+                        moduleNames.map(m => resolveModuleName(m, containingFile, options, host).resolvedModule);
+                    // Invalidate resolutions only when ts file is created
+                    if (implementHasInvalidatedResolution) host.hasInvalidatedResolution = () => sys.fileExists(`${projectRoot}/other.ts`);
+                    const watch = createWatchProgram(host);
+                    runWatchBaseline({
+                        scenario: "watchApi",
+                        subScenario,
+                        commandLineArgs: ["--w"],
+                        sys,
+                        baseline,
+                        oldSnap,
+                        getPrograms,
+                        changes: [
+                            {
+                                caption: "write other with same contents",
+                                change: sys => sys.appendFile(`${projectRoot}/other.d.ts`, ""),
+                                timeouts: sys => sys.runQueuedTimeoutCallbacks(),
+                            },
+                            {
+                                caption: "change other file",
+                                change: sys => sys.appendFile(`${projectRoot}/other.d.ts`, "export function bar(): void;"),
+                                timeouts: sys => sys.runQueuedTimeoutCallbacks(),
+                            },
+                            {
+                                caption: "write other with same contents but write ts file",
+                                change: sys => {
+                                    sys.appendFile(`${projectRoot}/other.d.ts`, "");
+                                    sys.writeFile(`${projectRoot}/other.ts`, "export function foo() {}");
+                                },
+                                timeouts: sys => sys.runQueuedTimeoutCallbacks(),
+                            },
+                        ],
+                        watchOrSolution: watch
+                    });
+                });
+            }
+            verifyWatch("host implements does not implement hasInvalidatedResolution", /*implementHasInvalidatedResolution*/ false);
+            verifyWatch("host implements hasInvalidatedResolution", /*implementHasInvalidatedResolution*/ true);
+        });
     });
 
     describe("unittests:: tsc-watch:: watchAPI:: tsc-watch expose error count to watch status reporter", () => {

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -3320,6 +3320,8 @@ declare namespace ts {
          */
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[] | readonly FileReference[], containingFile: string, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingFileMode?: SourceFile["impliedNodeFormat"] | undefined): (ResolvedTypeReferenceDirective | undefined)[];
         getEnvironmentVariable?(name: string): string | undefined;
+        /** If provided along with custom resolveModuleNames or resolveTypeReferenceDirectives, used to determine if unchanged file path needs to re-resolve modules/type reference directives */
+        hasInvalidatedResolution?(filePath: Path): boolean;
         createHash?(data: string): string;
         getParsedCommandLine?(fileName: string): ParsedCommandLine | undefined;
     }
@@ -5442,6 +5444,8 @@ declare namespace ts {
         resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingSourceFile?: SourceFile): (ResolvedModule | undefined)[];
         /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[] | readonly FileReference[], containingFile: string, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingFileMode?: SourceFile["impliedNodeFormat"] | undefined): (ResolvedTypeReferenceDirective | undefined)[];
+        /** If provided along with custom resolveModuleNames or resolveTypeReferenceDirectives, used to determine if unchanged file path needs to re-resolve modules/type reference directives */
+        hasInvalidatedResolution?(filePath: Path): boolean;
         /**
          * Returns the module resolution cache used by a provided `resolveModuleNames` implementation so that any non-name module resolution operations (eg, package.json lookup) can reuse it
          */

tests/baselines/reference/api/typescript.d.ts

@@ -3320,6 +3320,8 @@ declare namespace ts {
          */
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[] | readonly FileReference[], containingFile: string, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingFileMode?: SourceFile["impliedNodeFormat"] | undefined): (ResolvedTypeReferenceDirective | undefined)[];
         getEnvironmentVariable?(name: string): string | undefined;
+        /** If provided along with custom resolveModuleNames or resolveTypeReferenceDirectives, used to determine if unchanged file path needs to re-resolve modules/type reference directives */
+        hasInvalidatedResolution?(filePath: Path): boolean;
         createHash?(data: string): string;
         getParsedCommandLine?(fileName: string): ParsedCommandLine | undefined;
     }
@@ -5442,6 +5444,8 @@ declare namespace ts {
         resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingSourceFile?: SourceFile): (ResolvedModule | undefined)[];
         /** If provided, used to resolve type reference directives, otherwise typescript's default resolution */
         resolveTypeReferenceDirectives?(typeReferenceDirectiveNames: string[] | readonly FileReference[], containingFile: string, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions, containingFileMode?: SourceFile["impliedNodeFormat"] | undefined): (ResolvedTypeReferenceDirective | undefined)[];
+        /** If provided along with custom resolveModuleNames or resolveTypeReferenceDirectives, used to determine if unchanged file path needs to re-resolve modules/type reference directives */
+        hasInvalidatedResolution?(filePath: Path): boolean;
         /**
          * Returns the module resolution cache used by a provided `resolveModuleNames` implementation so that any non-name module resolution operations (eg, package.json lookup) can reuse it
          */

tests/baselines/reference/tscWatch/watchApi/host-implements-does-not-implement-hasInvalidatedResolution.js

@@ -0,0 +1,287 @@
+Input::
+//// [/user/username/projects/myproject/tsconfig.json]
+{"compilerOptions":{"traceResolution":true,"extendedDiagnostics":true},"files":["main.ts"]}
+
+//// [/user/username/projects/myproject/main.ts]
+import { foo } from "./other";
+
+//// [/user/username/projects/myproject/other.d.ts]
+export function foo(): void;
+
+//// [/a/lib/lib.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+
+/a/lib/tsc.js --w
+Output::
+>> Screen clear
+[12:00:23 AM] Starting compilation in watch mode...
+
+Current directory: /user/username/projects/myproject CaseSensitiveFileNames: false
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/tsconfig.json 2000 undefined Config file
+Synchronizing program
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/main.ts 250 undefined Source file
+======== Resolving module './other' from '/user/username/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'NodeJs'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/other', target file type 'TypeScript'.
+File '/user/username/projects/myproject/other.ts' does not exist.
+File '/user/username/projects/myproject/other.tsx' does not exist.
+File '/user/username/projects/myproject/other.d.ts' exist - use it as a name resolution result.
+======== Module name './other' was successfully resolved to '/user/username/projects/myproject/other.d.ts'. ========
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+FileWatcher:: Added:: WatchInfo: /a/lib/lib.d.ts 250 undefined Source file
+DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject/node_modules/@types 1 undefined Type roots
+Elapsed:: *ms DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject/node_modules/@types 1 undefined Type roots
+[12:00:26 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Shape signatures in builder refreshed for::
+/a/lib/lib.d.ts (used version)
+/user/username/projects/myproject/other.d.ts (used version)
+/user/username/projects/myproject/main.ts (used version)
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/main.js]
+"use strict";
+exports.__esModule = true;
+
+
+
+Change:: write other with same contents
+
+Input::
+//// [/user/username/projects/myproject/other.d.ts] file changed its modified time
+
+Output::
+FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Scheduling update
+Elapsed:: *ms FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Synchronizing program
+[12:00:29 AM] File change detected. Starting incremental compilation...
+
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+======== Resolving module './other' from '/user/username/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'NodeJs'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/other', target file type 'TypeScript'.
+File '/user/username/projects/myproject/other.ts' does not exist.
+File '/user/username/projects/myproject/other.tsx' does not exist.
+File '/user/username/projects/myproject/other.d.ts' exist - use it as a name resolution result.
+======== Module name './other' was successfully resolved to '/user/username/projects/myproject/other.d.ts'. ========
+[12:00:30 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: SafeModules
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+
+No shapes updated in the builder::
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+
+Change:: change other file
+
+Input::
+//// [/user/username/projects/myproject/other.d.ts]
+export function foo(): void;export function bar(): void;
+
+
+Output::
+FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Scheduling update
+Elapsed:: *ms FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Synchronizing program
+[12:00:33 AM] File change detected. Starting incremental compilation...
+
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+======== Resolving module './other' from '/user/username/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'NodeJs'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/other', target file type 'TypeScript'.
+File '/user/username/projects/myproject/other.ts' does not exist.
+File '/user/username/projects/myproject/other.tsx' does not exist.
+File '/user/username/projects/myproject/other.d.ts' exist - use it as a name resolution result.
+======== Module name './other' was successfully resolved to '/user/username/projects/myproject/other.d.ts'. ========
+[12:00:37 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: SafeModules
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/other.d.ts (used version)
+/user/username/projects/myproject/main.ts (computed .d.ts)
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/main.js] file written with same contents
+
+Change:: write other with same contents but write ts file
+
+Input::
+//// [/user/username/projects/myproject/other.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/other.ts]
+export function foo() {}
+
+
+Output::
+FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Scheduling update
+Elapsed:: *ms FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Synchronizing program
+[12:00:42 AM] File change detected. Starting incremental compilation...
+
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+======== Resolving module './other' from '/user/username/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'NodeJs'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/other', target file type 'TypeScript'.
+File '/user/username/projects/myproject/other.ts' exist - use it as a name resolution result.
+======== Module name './other' was successfully resolved to '/user/username/projects/myproject/other.ts'. ========
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/other.ts 250 undefined Source file
+[12:00:48 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: SafeModules
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/other.ts
+/user/username/projects/myproject/main.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/other.ts (computed .d.ts)
+/user/username/projects/myproject/main.ts (computed .d.ts)
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+/user/username/projects/myproject/other.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/main.js] file written with same contents
+//// [/user/username/projects/myproject/other.js]
+"use strict";
+exports.__esModule = true;
+exports.foo = void 0;
+function foo() { }
+exports.foo = foo;
+
+

tests/baselines/reference/tscWatch/watchApi/host-implements-hasInvalidatedResolution.js

@@ -0,0 +1,273 @@
+Input::
+//// [/user/username/projects/myproject/tsconfig.json]
+{"compilerOptions":{"traceResolution":true,"extendedDiagnostics":true},"files":["main.ts"]}
+
+//// [/user/username/projects/myproject/main.ts]
+import { foo } from "./other";
+
+//// [/user/username/projects/myproject/other.d.ts]
+export function foo(): void;
+
+//// [/a/lib/lib.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+
+/a/lib/tsc.js --w
+Output::
+>> Screen clear
+[12:00:23 AM] Starting compilation in watch mode...
+
+Current directory: /user/username/projects/myproject CaseSensitiveFileNames: false
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/tsconfig.json 2000 undefined Config file
+Synchronizing program
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/main.ts 250 undefined Source file
+======== Resolving module './other' from '/user/username/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'NodeJs'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/other', target file type 'TypeScript'.
+File '/user/username/projects/myproject/other.ts' does not exist.
+File '/user/username/projects/myproject/other.tsx' does not exist.
+File '/user/username/projects/myproject/other.d.ts' exist - use it as a name resolution result.
+======== Module name './other' was successfully resolved to '/user/username/projects/myproject/other.d.ts'. ========
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+FileWatcher:: Added:: WatchInfo: /a/lib/lib.d.ts 250 undefined Source file
+DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject/node_modules/@types 1 undefined Type roots
+Elapsed:: *ms DirectoryWatcher:: Added:: WatchInfo: /user/username/projects/myproject/node_modules/@types 1 undefined Type roots
+[12:00:26 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Shape signatures in builder refreshed for::
+/a/lib/lib.d.ts (used version)
+/user/username/projects/myproject/other.d.ts (used version)
+/user/username/projects/myproject/main.ts (used version)
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/main.js]
+"use strict";
+exports.__esModule = true;
+
+
+
+Change:: write other with same contents
+
+Input::
+//// [/user/username/projects/myproject/other.d.ts] file changed its modified time
+
+Output::
+FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Scheduling update
+Elapsed:: *ms FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Synchronizing program
+[12:00:29 AM] File change detected. Starting incremental compilation...
+
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+[12:00:30 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: Completely
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+
+No shapes updated in the builder::
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+
+Change:: change other file
+
+Input::
+//// [/user/username/projects/myproject/other.d.ts]
+export function foo(): void;export function bar(): void;
+
+
+Output::
+FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Scheduling update
+Elapsed:: *ms FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Synchronizing program
+[12:00:33 AM] File change detected. Starting incremental compilation...
+
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+[12:00:37 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: Completely
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/other.d.ts
+/user/username/projects/myproject/main.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/other.d.ts (used version)
+/user/username/projects/myproject/main.ts (computed .d.ts)
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/main.js] file written with same contents
+
+Change:: write other with same contents but write ts file
+
+Input::
+//// [/user/username/projects/myproject/other.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/other.ts]
+export function foo() {}
+
+
+Output::
+FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Scheduling update
+Elapsed:: *ms FileWatcher:: Triggered with /user/username/projects/myproject/other.d.ts 1:: WatchInfo: /user/username/projects/myproject/other.d.ts 250 undefined Source file
+Synchronizing program
+[12:00:42 AM] File change detected. Starting incremental compilation...
+
+CreatingProgramWith::
+  roots: ["/user/username/projects/myproject/main.ts"]
+  options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+======== Resolving module './other' from '/user/username/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'NodeJs'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/other', target file type 'TypeScript'.
+File '/user/username/projects/myproject/other.ts' exist - use it as a name resolution result.
+======== Module name './other' was successfully resolved to '/user/username/projects/myproject/other.ts'. ========
+FileWatcher:: Added:: WatchInfo: /user/username/projects/myproject/other.ts 250 undefined Source file
+[12:00:48 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/main.ts"]
+Program options: {"traceResolution":true,"extendedDiagnostics":true,"configFilePath":"/user/username/projects/myproject/tsconfig.json"}
+Program structureReused: SafeModules
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/other.ts
+/user/username/projects/myproject/main.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/other.ts
+/user/username/projects/myproject/main.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/other.ts (computed .d.ts)
+/user/username/projects/myproject/main.ts (computed .d.ts)
+
+PolledWatches::
+/user/username/projects/myproject/node_modules/@types:
+  {"pollingInterval":500}
+
+FsWatches::
+/user/username/projects/myproject/tsconfig.json:
+  {}
+/user/username/projects/myproject/main.ts:
+  {}
+/user/username/projects/myproject/other.d.ts:
+  {}
+/a/lib/lib.d.ts:
+  {}
+/user/username/projects/myproject/other.ts:
+  {}
+
+FsWatchesRecursive::
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/main.js] file written with same contents
+//// [/user/username/projects/myproject/other.js]
+"use strict";
+exports.__esModule = true;
+exports.foo = void 0;
+function foo() { }
+exports.foo = foo;
+
+