Add telemetry for open JS files (#23833)

* Add telemetry for open JS files

* Send event every time

* Keep stats even for closed files

* Remove tsCheckCountForOpenFilesTelemetry

* Use 'info.path'

* Update API

src/harness/unittests/telemetry.ts

@@ -42,7 +42,7 @@ namespace ts.projectSystem {
             const et = new TestServerEventManager([...files, notIncludedFile, tsconfig]);
             et.service.openClientFile(files[0].path);
             et.assertProjectInfoTelemetryEvent({
-                fileStats: { ts: 2, tsx: 1, js: 1, jsx: 1, dts: 1 },
+                fileStats: fileStats({ ts: 2, tsx: 1, js: 1, jsx: 1, dts: 1 }),
                 compilerOptions,
                 include: true,
             });
@@ -234,9 +234,44 @@ namespace ts.projectSystem {
                 languageServiceEnabled: false,
             });
         });
+
+        describe("open files telemetry", () => {
+            it("sends event for inferred project", () => {
+                const ajs = makeFile("/a.js", "// @ts-check\nconst x = 0;");
+                const bjs = makeFile("/b.js");
+                const et = new TestServerEventManager([ajs, bjs]);
+
+                et.service.openClientFile(ajs.path);
+                et.assertOpenFileTelemetryEvent({ checkJs: true });
+
+                et.service.openClientFile(bjs.path);
+                et.assertOpenFileTelemetryEvent({ checkJs: false });
+
+                // No repeated send for opening a file seen before.
+                et.service.openClientFile(bjs.path);
+                et.assertNoOpenFilesTelemetryEvent();
+            });
+
+            it("not for '.ts' file", () => {
+                const ats = makeFile("/a.ts", "");
+                const et = new TestServerEventManager([ats]);
+
+                et.service.openClientFile(ats.path);
+                et.assertNoOpenFilesTelemetryEvent();
+            });
+
+            it("even for project with 'ts-check' in config", () => {
+                const file = makeFile("/a.js");
+                const compilerOptions: CompilerOptions = { checkJs: true };
+                const jsconfig = makeFile("/jsconfig.json", { compilerOptions });
+                const et = new TestServerEventManager([jsconfig, file]);
+                et.service.openClientFile(file.path);
+                et.assertOpenFileTelemetryEvent({ checkJs: false });
+            });
+        });
     });
 
     function makeFile(path: string, content: {} = ""): File {
-        return { path, content: isString(content) ? "" : JSON.stringify(content) };
+        return { path, content: isString(content) ? content : JSON.stringify(content) };
     }
 }

src/harness/unittests/tsserverProjectSystem.ts

@@ -215,7 +215,7 @@ namespace ts.projectSystem {
         }
 
         assertProjectInfoTelemetryEvent(partial: Partial<server.ProjectInfoTelemetryEventData>, configFile?: string): void {
-            assert.deepEqual(this.getEvent<server.ProjectInfoTelemetryEvent>(server.ProjectInfoTelemetryEvent), {
+            assert.deepEqual<server.ProjectInfoTelemetryEventData>(this.getEvent<server.ProjectInfoTelemetryEvent>(server.ProjectInfoTelemetryEvent), {
                 projectId: Harness.mockHash(configFile || "/tsconfig.json"),
                 fileStats: fileStats({ ts: 1 }),
                 compilerOptions: {},
@@ -236,6 +236,13 @@ namespace ts.projectSystem {
                 ...partial,
             });
         }
+
+        assertOpenFileTelemetryEvent(info: server.OpenFileInfo): void {
+            assert.deepEqual<server.OpenFileInfoTelemetryEventData>(this.getEvent<server.OpenFileInfoTelemetryEvent>(server.OpenFileInfoTelemetryEvent), { info });
+        }
+        assertNoOpenFilesTelemetryEvent(): void {
+            this.hasZeroEvent<server.OpenFileInfoTelemetryEvent>(server.OpenFileInfoTelemetryEvent);
+        }
     }
 
     class TestSession extends server.Session {
@@ -2755,7 +2762,7 @@ namespace ts.projectSystem {
             const session = createSession(host, {
                 canUseEvents: true,
                 eventHandler: e => {
-                    if (e.eventName === server.ConfigFileDiagEvent || e.eventName === server.ProjectsUpdatedInBackgroundEvent || e.eventName === server.ProjectInfoTelemetryEvent) {
+                    if (e.eventName === server.ConfigFileDiagEvent || e.eventName === server.ProjectsUpdatedInBackgroundEvent || e.eventName === server.ProjectInfoTelemetryEvent || e.eventName === server.OpenFileInfoTelemetryEvent) {
                         return;
                     }
                     assert.equal(e.eventName, server.ProjectLanguageServiceStateEvent);
@@ -2807,7 +2814,7 @@ namespace ts.projectSystem {
             const session = createSession(host, {
                 canUseEvents: true,
                 eventHandler: e => {
-                    if (e.eventName === server.ConfigFileDiagEvent || e.eventName === server.ProjectInfoTelemetryEvent) {
+                    if (e.eventName === server.ConfigFileDiagEvent || e.eventName === server.ProjectInfoTelemetryEvent || e.eventName === server.OpenFileInfoTelemetryEvent) {
                         return;
                     }
                     assert.equal(e.eventName, server.ProjectLanguageServiceStateEvent);
@@ -6241,14 +6248,14 @@ namespace ts.projectSystem {
 
             function verifyNoCall(callback: CalledMaps) {
                 const calledMap = calledMaps[callback];
-                assert.equal(calledMap.size, 0, `${callback} shouldnt be called: ${arrayFrom(calledMap.keys())}`);
+                assert.equal(calledMap.size, 0, `${callback} shouldn't be called: ${arrayFrom(calledMap.keys())}`);
             }
 
             function verifyCalledOnEachEntry(callback: CalledMaps, expectedKeys: Map<number>) {
                 TestFSWithWatch.checkMultiMapKeyCount(callback, calledMaps[callback], expectedKeys);
             }
 
-            function verifyCalledOnEachEntryNTimes(callback: CalledMaps, expectedKeys: string[], nTimes: number) {
+            function verifyCalledOnEachEntryNTimes(callback: CalledMaps, expectedKeys: ReadonlyArray<string>, nTimes: number) {
                 TestFSWithWatch.checkMultiMapEachKeyWithCount(callback, calledMaps[callback], expectedKeys, nTimes);
             }
 
@@ -6256,7 +6263,7 @@ namespace ts.projectSystem {
                 iterateOnCalledMaps(key => verifyNoCall(key));
             }
 
-            function verifyNoHostCallsExceptFileExistsOnce(expectedKeys: string[]) {
+            function verifyNoHostCallsExceptFileExistsOnce(expectedKeys: ReadonlyArray<string>) {
                 verifyCalledOnEachEntryNTimes(CalledMapsWithSingleArg.fileExists, expectedKeys, 1);
                 verifyNoCall(CalledMapsWithSingleArg.directoryExists);
                 verifyNoCall(CalledMapsWithSingleArg.getDirectories);

src/server/editorServices.ts

@@ -6,6 +6,7 @@ namespace ts.server {
     export const ConfigFileDiagEvent = "configFileDiag";
     export const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
     export const ProjectInfoTelemetryEvent = "projectInfo";
+    export const OpenFileInfoTelemetryEvent = "openFileInfo";
     // tslint:enable variable-name
 
     export interface ProjectsUpdatedInBackgroundEvent {
@@ -55,6 +56,20 @@ namespace ts.server {
         readonly version: string;
     }
 
+    /**
+     * Info that we may send about a file that was just opened.
+     * Info about a file will only be sent once per session, even if the file changes in ways that might affect the info.
+     * Currently this is only sent for '.js' files.
+     */
+    export interface OpenFileInfoTelemetryEvent {
+        readonly eventName: typeof OpenFileInfoTelemetryEvent;
+        readonly data: OpenFileInfoTelemetryEventData;
+    }
+
+    export interface OpenFileInfoTelemetryEventData {
+        readonly info: OpenFileInfo;
+    }
+
     export interface ProjectInfoTypeAcquisitionData {
         readonly enable: boolean;
         // Actual values of include/exclude entries are scrubbed.
@@ -70,7 +85,11 @@ namespace ts.server {
         readonly dts: number;
     }
 
-    export type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent;
+    export interface OpenFileInfo {
+        readonly checkJs: boolean;
+    }
+
+    export type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
 
     export type ProjectServiceEventHandler = (event: ProjectServiceEvent) => void;
 
@@ -325,6 +344,9 @@ namespace ts.server {
          * Container of all known scripts
          */
         private readonly filenameToScriptInfo = createMap<ScriptInfo>();
+        // Set of all '.js' files ever opened.
+        private readonly allJsFilesForOpenFileTelemetry = createMap<true>();
+
         /**
          * Map to the real path of the infos
          */
@@ -2095,9 +2117,19 @@ namespace ts.server {
 
             this.printProjects();
 
+            this.telemetryOnOpenFile(info);
             return { configFileName, configFileErrors };
         }
 
+        private telemetryOnOpenFile(scriptInfo: ScriptInfo): void {
+            if (!this.eventHandler || !scriptInfo.isJavaScript() || !addToSeen(this.allJsFilesForOpenFileTelemetry, scriptInfo.path)) {
+                return;
+            }
+
+            const info: OpenFileInfo = { checkJs: !!scriptInfo.getDefaultProject().getSourceFile(scriptInfo.path).checkJsDirective };
+            this.eventHandler({ eventName: OpenFileInfoTelemetryEvent, data: { info } });
+        }
+
         /**
          * Close file whose contents is managed by the client
          * @param filename is absolute pathname

src/server/project.ts

@@ -6,9 +6,12 @@ namespace ts.server {
         External
     }
 
+    /* @internal */
+    export type Mutable<T> = { -readonly [K in keyof T]: T[K]; };
+
     /* @internal */
     export function countEachFileTypes(infos: ScriptInfo[]): FileStats {
-        const result = { js: 0, jsx: 0, ts: 0, tsx: 0, dts: 0 };
+        const result: Mutable<FileStats> = { js: 0, jsx: 0, ts: 0, tsx: 0, dts: 0 };
         for (const info of infos) {
             switch (info.scriptKind) {
                 case ScriptKind.JS:

src/server/typingsCache.ts

@@ -11,7 +11,7 @@ namespace ts.server {
         enqueueInstallTypingsRequest(p: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>): void;
         attach(projectService: ProjectService): void;
         onProjectClosed(p: Project): void;
-        readonly globalTypingsCacheLocation: string;
+        readonly globalTypingsCacheLocation: string | undefined;
     }
 
     export const nullTypingsInstaller: ITypingsInstaller = {

src/services/preProcess.ts

@@ -1,7 +1,7 @@
 namespace ts {
     export function preProcessFile(sourceText: string, readImportFiles = true, detectJavaScriptImports = false): PreProcessedFileInfo {
         const pragmaContext: PragmaContext = {
-            languageVersion: ScriptTarget.ES5, // controls weather the token scanner considers unicode identifiers or not - shouldn't matter, since we're only using it for trivia
+            languageVersion: ScriptTarget.ES5, // controls whether the token scanner considers unicode identifiers or not - shouldn't matter, since we're only using it for trivia
             pragmas: undefined,
             checkJsDirective: undefined,
             referencedFiles: [],

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

@@ -7734,7 +7734,7 @@ declare namespace ts.server {
         enqueueInstallTypingsRequest(p: Project, typeAcquisition: TypeAcquisition, unresolvedImports: SortedReadonlyArray<string>): void;
         attach(projectService: ProjectService): void;
         onProjectClosed(p: Project): void;
-        readonly globalTypingsCacheLocation: string;
+        readonly globalTypingsCacheLocation: string | undefined;
     }
     const nullTypingsInstaller: ITypingsInstaller;
 }
@@ -7971,6 +7971,7 @@ declare namespace ts.server {
     const ConfigFileDiagEvent = "configFileDiag";
     const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
     const ProjectInfoTelemetryEvent = "projectInfo";
+    const OpenFileInfoTelemetryEvent = "openFileInfo";
     interface ProjectsUpdatedInBackgroundEvent {
         eventName: typeof ProjectsUpdatedInBackgroundEvent;
         data: {
@@ -8019,6 +8020,18 @@ declare namespace ts.server {
         /** TypeScript version used by the server. */
         readonly version: string;
     }
+    /**
+     * Info that we may send about a file that was just opened.
+     * Info about a file will only be sent once per session, even if the file changes in ways that might affect the info.
+     * Currently this is only sent for '.js' files.
+     */
+    interface OpenFileInfoTelemetryEvent {
+        readonly eventName: typeof OpenFileInfoTelemetryEvent;
+        readonly data: OpenFileInfoTelemetryEventData;
+    }
+    interface OpenFileInfoTelemetryEventData {
+        readonly info: OpenFileInfo;
+    }
     interface ProjectInfoTypeAcquisitionData {
         readonly enable: boolean;
         readonly include: boolean;
@@ -8031,7 +8044,10 @@ declare namespace ts.server {
         readonly tsx: number;
         readonly dts: number;
     }
-    type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent;
+    interface OpenFileInfo {
+        readonly checkJs: boolean;
+    }
+    type ProjectServiceEvent = ProjectsUpdatedInBackgroundEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
     type ProjectServiceEventHandler = (event: ProjectServiceEvent) => void;
     interface SafeList {
         [name: string]: {
@@ -8082,6 +8098,7 @@ declare namespace ts.server {
          * Container of all known scripts
          */
         private readonly filenameToScriptInfo;
+        private readonly allJsFilesForOpenFileTelemetry;
         /**
          * maps external project file name to list of config files that were the part of this project
          */
@@ -8286,6 +8303,7 @@ declare namespace ts.server {
         openClientFile(fileName: string, fileContent?: string, scriptKind?: ScriptKind, projectRootPath?: string): OpenConfiguredProjectResult;
         private findExternalProjectContainingOpenScriptInfo;
         openClientFileWithNormalizedPath(fileName: NormalizedPath, fileContent?: string, scriptKind?: ScriptKind, hasMixedContent?: boolean, projectRootPath?: NormalizedPath): OpenConfiguredProjectResult;
+        private telemetryOnOpenFile;
         /**
          * Close file whose contents is managed by the client
          * @param filename is absolute pathname