Migrate 'ts.performance' to use native performance hooks when available

src/compiler/diagnosticMessages.json

@@ -4719,6 +4719,10 @@
         "code": 6385,
         "reportsDeprecated": true
     },
+    "Performance timings for '--diagnostics' or '--extendedDiagnostics' are not available in this session. A native implementation of the Web Performance API could not be found.": {
+        "category": "Message",
+        "code": 6386
+    },
 
     "The expected type comes from property '{0}' which is declared here on type '{1}'": {
         "category": "Message",

src/compiler/performance.ts

@@ -1,16 +1,12 @@
 /*@internal*/
 /** Performance measurements for the compiler. */
 namespace ts.performance {
-    declare const onProfilerEvent: { (markName: string): void; profiler: boolean; };
-
-    // NOTE: cannot use ts.noop as core.ts loads after this
-    const profilerEvent: (markName: string) => void = typeof onProfilerEvent === "function" && onProfilerEvent.profiler === true ? onProfilerEvent : () => { /*empty*/ };
-
-    let enabled = false;
-    let profilerStart = 0;
-    let counts: ESMap<string, number>;
-    let marks: ESMap<string, number>;
-    let measures: ESMap<string, number>;
+    let perfHooks: PerformanceHooks | undefined;
+    let perfObserver: PerformanceObserver | undefined;
+    let perfEntryList: PerformanceObserverEntryList | undefined;
+    // when set, indicates the implementation of `Performance` to use for user timing.
+    // when unset, indicates user timing is unavailable or disabled.
+    let performanceImpl: Performance | undefined;
 
     export interface Timer {
         enter(): void;
@@ -53,11 +49,7 @@ namespace ts.performance {
      * @param markName The name of the mark.
      */
     export function mark(markName: string) {
-        if (enabled) {
-            marks.set(markName, timestamp());
-            counts.set(markName, (counts.get(markName) || 0) + 1);
-            profilerEvent(markName);
-        }
+        performanceImpl?.mark(markName);
     }
 
     /**
@@ -70,11 +62,7 @@ namespace ts.performance {
      *      used.
      */
     export function measure(measureName: string, startMarkName?: string, endMarkName?: string) {
-        if (enabled) {
-            const end = endMarkName && marks.get(endMarkName) || timestamp();
-            const start = startMarkName && marks.get(startMarkName) || profilerStart;
-            measures.set(measureName, (measures.get(measureName) || 0) + (end - start));
-        }
+        performanceImpl?.measure(measureName, startMarkName, endMarkName);
     }
 
     /**
@@ -83,7 +71,7 @@ namespace ts.performance {
      * @param markName The name of the mark.
      */
     export function getCount(markName: string) {
-        return counts && counts.get(markName) || 0;
+        return perfEntryList?.getEntriesByName(markName, "mark").length || 0;
     }
 
     /**
@@ -92,7 +80,7 @@ namespace ts.performance {
      * @param measureName The name of the measure whose durations should be accumulated.
      */
     export function getDuration(measureName: string) {
-        return measures && measures.get(measureName) || 0;
+        return perfEntryList?.getEntriesByName(measureName, "measure").reduce((a, entry) => a + entry.duration, 0) || 0;
     }
 
     /**
@@ -101,22 +89,31 @@ namespace ts.performance {
      * @param cb The action to perform for each measure
      */
     export function forEachMeasure(cb: (measureName: string, duration: number) => void) {
-        measures.forEach((measure, key) => {
-            cb(key, measure);
-        });
+        perfEntryList?.getEntriesByType("measure").forEach(({ name, duration }) => { cb(name, duration); });
+    }
+
+    /**
+     * Indicates whether the performance API is enabled.
+     */
+    export function isEnabled() {
+        return !!performanceImpl;
     }
 
     /** Enables (and resets) performance measurements for the compiler. */
     export function enable() {
-        counts = new Map<string, number>();
-        marks = new Map<string, number>();
-        measures = new Map<string, number>();
-        enabled = true;
-        profilerStart = timestamp();
+        if (!performanceImpl) {
+            perfHooks ||= tryGetNativePerformanceHooks();
+            if (!perfHooks) return false;
+            perfObserver ||= new perfHooks.PerformanceObserver(list => perfEntryList = list);
+            perfObserver.observe({ entryTypes: ["mark", "measure"] });
+            performanceImpl = perfHooks.performance;
+        }
+        return true;
     }
 
     /** Disables performance measurements for the compiler. */
     export function disable() {
-        enabled = false;
+        perfObserver?.disconnect();
+        performanceImpl = undefined;
     }
 }

src/compiler/performanceCore.ts

@@ -0,0 +1,121 @@
+/*@internal*/
+namespace ts {
+    // The following definitions provide the minimum compatible support for the Web Performance User Timings API
+    // between browsers and NodeJS:
+
+    export interface PerformanceHooks {
+        performance: Performance;
+        PerformanceObserver: PerformanceObserverConstructor;
+    }
+
+    export interface Performance {
+        mark(name: string): void;
+        measure(name: string, startMark?: string, endMark?: string): void;
+        now(): number;
+        timeOrigin: number;
+    }
+
+    export interface PerformanceEntry {
+        name: string;
+        entryType: string;
+        startTime: number;
+        duration: number;
+    }
+
+    export interface PerformanceObserverEntryList {
+        getEntries(): PerformanceEntryList;
+        getEntriesByName(name: string, type?: string): PerformanceEntryList;
+        getEntriesByType(type: string): PerformanceEntryList;
+    }
+
+    export interface PerformanceObserver {
+        disconnect(): void;
+        observe(options: { entryTypes: readonly string[] }): void;
+    }
+
+    export type PerformanceObserverConstructor = new (callback: (list: PerformanceObserverEntryList, observer: PerformanceObserver) => void) => PerformanceObserver;
+    export type PerformanceEntryList = PerformanceEntry[];
+
+    // Browser globals for the Web Performance User Timings API
+    declare const performance: Performance | undefined;
+    declare const PerformanceObserver: PerformanceObserverConstructor | undefined;
+
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    function hasRequiredAPI(performance: Performance | undefined, PerformanceObserver: PerformanceObserverConstructor | undefined) {
+        return typeof performance === "object" &&
+            typeof performance.timeOrigin === "number" &&
+            typeof performance.mark === "function" &&
+            typeof performance.measure === "function" &&
+            typeof performance.now === "function" &&
+            typeof PerformanceObserver === "function";
+    }
+
+    function tryGetWebPerformanceHooks(): PerformanceHooks | undefined {
+        if (typeof performance === "object" &&
+            typeof PerformanceObserver === "function" &&
+            hasRequiredAPI(performance, PerformanceObserver)) {
+            return {
+                performance,
+                PerformanceObserver
+            };
+        }
+    }
+
+    function tryGetNodePerformanceHooks(): PerformanceHooks | undefined {
+        if (typeof module === "object" && typeof require === "function") {
+            try {
+                const { performance, PerformanceObserver } = require("perf_hooks") as typeof import("perf_hooks");
+                if (hasRequiredAPI(performance, PerformanceObserver)) {
+                    // There is a bug in Node's performance.measure prior to 12.16.3/13.13.0 that does not
+                    // match the Web Performance API specification. Node's implementation did not allow
+                    // optional `start` and `end` arguments for `performance.measure`.
+                    // See https://github.com/nodejs/node/pull/32651 for more information.
+                    const version = new Version(process.versions.node);
+                    const range = new VersionRange("<12 || 13 <13.13");
+                    if (range.test(version)) {
+                        return {
+                            performance: {
+                                get timeOrigin() { return performance.timeOrigin; },
+                                now() { return performance.now(); },
+                                mark(name) { return performance.mark(name); },
+                                measure(name, start = "nodeStart", end?) {
+                                    if (end === undefined) {
+                                        end = "__performance.measure-fix__";
+                                        performance.mark(end);
+                                    }
+                                    performance.measure(name, start, end);
+                                    if (end = "__performance.measure-fix__") {
+                                        performance.clearMarks("__performance.measure-fix__");
+                                    }
+                                }
+                            },
+                            PerformanceObserver
+                        };
+                    }
+                    return {
+                        performance,
+                        PerformanceObserver
+                    };
+                }
+            }
+            catch {
+                // ignore errors
+            }
+        }
+    }
+
+    // Unlike with the native Map/Set 'tryGet' functions in corePublic.ts, we eagerly evaluate these
+    // since we will need them for `timestamp`, below.
+    const nativePerformanceHooks = tryGetWebPerformanceHooks() || tryGetNodePerformanceHooks();
+    const nativePerformance = nativePerformanceHooks?.performance;
+
+    export function tryGetNativePerformanceHooks() {
+        return nativePerformanceHooks;
+    }
+
+    /** Gets a timestamp with (at least) ms resolution */
+    export const timestamp =
+        nativePerformance ? () => nativePerformance.now() :
+        Date.now ? Date.now :
+        () => +(new Date());
+}

src/compiler/tsconfig.json

@@ -13,7 +13,7 @@
         "corePublic.ts",
         "core.ts",
         "debug.ts",
-        "performanceTimestamp.ts",
+        "performanceCore.ts",
         "performance.ts",
         "perfLogger.ts",
         "semver.ts",

src/executeCommandLine/executeCommandLine.ts

@@ -648,19 +648,22 @@ namespace ts {
                 reportStatisticalValue("Memory used", Math.round(memoryUsed / 1000) + "K");
             }
 
-            const programTime = performance.getDuration("Program");
-            const bindTime = performance.getDuration("Bind");
-            const checkTime = performance.getDuration("Check");
-            const emitTime = performance.getDuration("Emit");
+            const isPerformanceEnabled = performance.isEnabled();
+            const programTime = isPerformanceEnabled ? performance.getDuration("Program") : 0;
+            const bindTime = isPerformanceEnabled ? performance.getDuration("Bind") : 0;
+            const checkTime = isPerformanceEnabled ? performance.getDuration("Check") : 0;
+            const emitTime = isPerformanceEnabled ? performance.getDuration("Emit") : 0;
             if (compilerOptions.extendedDiagnostics) {
                 const caches = program.getRelationCacheSizes();
                 reportCountStatistic("Assignability cache size", caches.assignable);
                 reportCountStatistic("Identity cache size", caches.identity);
                 reportCountStatistic("Subtype cache size", caches.subtype);
                 reportCountStatistic("Strict subtype cache size", caches.strictSubtype);
-                performance.forEachMeasure((name, duration) => reportTimeStatistic(`${name} time`, duration));
+                if (isPerformanceEnabled) {
+                    performance.forEachMeasure((name, duration) => reportTimeStatistic(`${name} time`, duration));
+                }
             }
-            else {
+            else if (isPerformanceEnabled) {
                 // Individual component times.
                 // Note: To match the behavior of previous versions of the compiler, the reported parse time includes
                 // I/O read time and processing time for triple-slash references and module imports, and the reported
@@ -672,10 +675,16 @@ namespace ts {
                 reportTimeStatistic("Check time", checkTime);
                 reportTimeStatistic("Emit time", emitTime);
             }
-            reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);
+            if (isPerformanceEnabled) {
+                reportTimeStatistic("Total time", programTime + bindTime + checkTime + emitTime);
+            }
             reportStatistics();
-
-            performance.disable();
+            if (!isPerformanceEnabled) {
+                sys.write(Diagnostics.Performance_timings_for_diagnostics_or_extendedDiagnostics_are_not_available_in_this_session_A_native_implementation_of_the_Web_Performance_API_could_not_be_found.message + "\n");
+            }
+            else {
+                performance.disable();
+            }
         }
 
         function reportStatistics() {

src/shims/tsconfig.json

@@ -4,6 +4,6 @@
         "outFile": "../../built/local/shims.js"
     },
     "files": [
-        "collectionShims.ts"
+        "collectionShims.ts",
     ]
 }

src/testRunner/unittests/tscWatch/helpers.ts

@@ -43,7 +43,7 @@ namespace ts.tscWatch {
         return createWatchProgram(compilerHost);
     }
 
-    const elapsedRegex = /^Elapsed:: [0-9]+ms/;
+    const elapsedRegex = /^Elapsed:: \d+(?:\.\d+)?ms/;
     const buildVerboseLogRegEx = /^.+ \- /;
     export enum HostOutputKind {
         Log,