Require the NativePerformance module and drop the legacy performance fallback

Summary:
`setUpPerformance` previously branched between the modern Performance API setup and a barebones `performance` stub depending on whether the native Performance module was available. The native module is now always present in supported runtimes, so this consolidates everything on the modern setup and removes the dead fallback path.

- `NativePerformance` is now resolved via `getEnforcing` instead of a nullable `get`, and its `timeOrigin` method is no longer optional (the native module always implements it).
- Removed the legacy `performance` stub and the `global.nativePerformanceNow` fallbacks, along with the now-redundant `nullthrows`/null checks and the `getCurrentTimeStamp` indirection (native `now`/`timeOrigin` are cached directly).
- `Libraries/Core/setUpPerformance` is kept as a thin alias of the internal setup module so external callers importing it keep working; the internal module was renamed from `setUpPerformanceModern` to `setUpPerformance`.

Changelog: [Internal]

Differential Revision: D112116429

Author: rubennorte

packages/react-native/Libraries/Core/setUpPerformance.js

@@ -8,25 +8,8 @@
  * @format
  */
 
-import setUpPerformanceModern from '../../src/private/setup/setUpPerformanceModern';
-import NativePerformance from '../../src/private/webapis/performance/specs/NativePerformance';
+// Kept as an alias of the internal `setUpPerformance` module for external
+// consumers that import this path directly.
+import setUpPerformance from '../../src/private/setup/setUpPerformance';
 
-// In case if the native implementation of the Performance API is available, use it,
-// otherwise fall back to the legacy/default one, which only defines 'Performance.now()'
-if (NativePerformance) {
-  setUpPerformanceModern();
-} else {
-  if (!global.performance) {
-    // $FlowExpectedError[cannot-write]
-    global.performance = {
-      mark: () => {},
-      clearMarks: () => {},
-      measure: () => {},
-      clearMeasures: () => {},
-      now: () => {
-        const performanceNow = global.nativePerformanceNow || Date.now;
-        return performanceNow();
-      },
-    };
-  }
-}
+setUpPerformance();

packages/react-native/src/private/setup/setUpDefaultReactNativeEnvironment.js

@@ -21,7 +21,7 @@ export default function setUpDefaltReactNativeEnvironment(
 
   require('../../../Libraries/Core/setUpGlobals');
   require('./setUpDOM').default();
-  require('../../../Libraries/Core/setUpPerformance');
+  require('./setUpPerformance').default();
   require('../../../Libraries/Core/polyfillPromise');
   require('../../../Libraries/Core/setUpTimers');
   if (__DEV__ && enableDeveloperTools) {

…/private/setup/setUpPerformanceModern.js …ve/src/private/setup/setUpPerformance.jspackages/react-native/src/private/setup/setUpPerformanceModern.js renamed to packages/react-native/src/private/setup/setUpPerformance.js packages/react-native/src/private/setup/setUpPerformanceModern.js renamed to packages/react-native/src/private/setup/setUpPerformance.js

@@ -12,7 +12,7 @@ import {polyfillGlobal} from '../../../Libraries/Utilities/PolyfillFunctions';
 
 let initialized = false;
 
-export default function setUpPerformanceModern() {
+export default function setUpPerformance() {
   if (initialized) {
     return;
   }

packages/react-native/src/private/webapis/performance/EventTiming.js

@@ -16,10 +16,7 @@ import type {
 } from './PerformanceEntry';
 
 import {PerformanceEntry} from './PerformanceEntry';
-import MaybeNativePerformance from './specs/NativePerformance';
-import nullthrows from 'nullthrows';
-
-const NativePerformance = nullthrows(MaybeNativePerformance);
+import NativePerformance from './specs/NativePerformance';
 
 export type PerformanceEventTimingJSON = {
   ...PerformanceEntryJSON,

packages/react-native/src/private/webapis/performance/Performance.js

@@ -29,12 +29,10 @@ import {
   performanceEntryTypeToRaw,
   rawToPerformanceEntry,
 } from './internals/RawPerformanceEntry';
-import {getCurrentTimeStamp} from './internals/Utilities';
 import MemoryInfo from './MemoryInfo';
 import ReactNativeStartupTiming from './ReactNativeStartupTiming';
-import MaybeNativePerformance from './specs/NativePerformance';
+import NativePerformance from './specs/NativePerformance';
 import {PerformanceMark, PerformanceMeasure} from './UserTiming';
-import nullthrows from 'nullthrows';
 
 export type PerformanceMeasureOptions =
   | Readonly<{
@@ -56,13 +54,8 @@ export type PerformanceMeasureOptions =
 const ENTRY_TYPES_AVAILABLE_FROM_TIMELINE: ReadonlyArray<PerformanceEntryType> =
   ['mark', 'measure'];
 
-const NativePerformance = nullthrows(MaybeNativePerformance);
-
-const cachedReportMark = NativePerformance.reportMark;
-const cachedReportMeasure = NativePerformance.reportMeasure;
-const cachedGetMarkTime = NativePerformance.getMarkTime;
-const cachedNativeClearMarks = NativePerformance.clearMarks;
-const cachedNativeClearMeasures = NativePerformance.clearMeasures;
+const {now, reportMark, reportMeasure, getMarkTime, clearMarks, clearMeasures} =
+  NativePerformance;
 let cachedTimeOrigin: ?DOMHighResTimeStamp;
 
 const MARK_OPTIONS_REUSABLE_OBJECT: PerformanceMarkOptions = {
@@ -78,7 +71,7 @@ const MEASURE_OPTIONS_REUSABLE_OBJECT: PerformanceMeasureInit = {
 };
 
 const getMarkTimeForMeasure = (markName: string): number => {
-  const markTime = cachedGetMarkTime(markName);
+  const markTime = getMarkTime(markName);
   if (markTime == null) {
     throw new DOMException(
       `Failed to execute 'measure' on 'Performance': The mark '${markName}' does not exist.`,
@@ -147,12 +140,7 @@ export default class Performance {
    */
   get timeOrigin(): DOMHighResTimeStamp {
     if (cachedTimeOrigin == null) {
-      if (NativePerformance.timeOrigin) {
-        cachedTimeOrigin = NativePerformance?.timeOrigin();
-      } else {
-        // Very naive polyfill.
-        cachedTimeOrigin = Date.now() - getCurrentTimeStamp();
-      }
+      cachedTimeOrigin = NativePerformance.timeOrigin();
     }
 
     return cachedTimeOrigin;
@@ -202,7 +190,7 @@ export default class Performance {
         );
       }
     } else {
-      resolvedStartTime = getCurrentTimeStamp();
+      resolvedStartTime = now();
     }
 
     if (detail !== undefined) {
@@ -219,13 +207,13 @@ export default class Performance {
       MARK_OPTIONS_REUSABLE_OBJECT,
     );
 
-    cachedReportMark(resolvedMarkName, resolvedStartTime, entry);
+    reportMark(resolvedMarkName, resolvedStartTime, entry);
 
     return entry;
   }
 
   clearMarks(markName?: string): void {
-    cachedNativeClearMarks(markName);
+    clearMarks(markName);
   }
 
   measure(
@@ -347,7 +335,7 @@ export default class Performance {
             ) {
               resolvedDuration = resolvedEndTime - resolvedStartTime;
             } else {
-              resolvedDuration = getCurrentTimeStamp() - resolvedStartTime;
+              resolvedDuration = now() - resolvedStartTime;
             }
           }
 
@@ -364,7 +352,7 @@ export default class Performance {
             resolvedDuration =
               getMarkTimeForMeasure(endMark) - resolvedStartTime;
           } else {
-            resolvedDuration = getCurrentTimeStamp() - resolvedStartTime;
+            resolvedDuration = now() - resolvedStartTime;
           }
           break;
         }
@@ -375,7 +363,7 @@ export default class Performance {
             resolvedDuration =
               getMarkTimeForMeasure(endMark) - resolvedStartTime;
           } else {
-            resolvedDuration = getCurrentTimeStamp() - resolvedStartTime;
+            resolvedDuration = now() - resolvedStartTime;
           }
         }
       }
@@ -385,7 +373,7 @@ export default class Performance {
       if (endMark !== undefined) {
         resolvedDuration = getMarkTimeForMeasure(endMark) - resolvedStartTime;
       } else {
-        resolvedDuration = getCurrentTimeStamp() - resolvedStartTime;
+        resolvedDuration = now() - resolvedStartTime;
       }
     }
 
@@ -400,7 +388,7 @@ export default class Performance {
 
     const entry = new PerformanceMeasure(MEASURE_OPTIONS_REUSABLE_OBJECT);
 
-    cachedReportMeasure(
+    reportMeasure(
       resolvedMeasureName,
       resolvedStartTime,
       resolvedDuration,
@@ -411,14 +399,14 @@ export default class Performance {
   }
 
   clearMeasures(measureName?: string): void {
-    cachedNativeClearMeasures(measureName);
+    clearMeasures(measureName);
   }
 
   /**
    * Returns a double, measured in milliseconds.
    * https://developer.mozilla.org/en-US/docs/Web/API/Performance/now
    */
-  now: () => DOMHighResTimeStamp = getCurrentTimeStamp;
+  now: () => DOMHighResTimeStamp = now;
 
   /**
    * An extension that allows to get back to JS all currently logged marks/measures

packages/react-native/src/private/webapis/performance/PerformanceObserver.js

@@ -21,13 +21,11 @@ import {
   rawToPerformanceEntry,
   rawToPerformanceEntryType,
 } from './internals/RawPerformanceEntry';
-import MaybeNativePerformance from './specs/NativePerformance';
+import NativePerformance from './specs/NativePerformance';
 import nullthrows from 'nullthrows';
 
 export {PerformanceEntry} from './PerformanceEntry';
 
-const NativePerformance = nullthrows(MaybeNativePerformance);
-
 export class PerformanceObserverEntryList {
   #entries: PerformanceEntryList;
 

packages/react-native/src/private/webapis/performance/UserTiming.js

@@ -18,8 +18,10 @@ import type {
   ExtensionTrackEntryPayload,
 } from './UserTimingExtensibility';
 
-import {getCurrentTimeStamp} from './internals/Utilities';
 import {PerformanceEntry} from './PerformanceEntry';
+import NativePerformance from './specs/NativePerformance';
+
+const {now} = NativePerformance;
 
 export type DetailType =
   | unknown
@@ -47,7 +49,7 @@ class PerformanceMarkTemplate extends PerformanceEntry {
   constructor(markName: string, markOptions?: PerformanceMarkOptions) {
     super('mark', {
       name: markName,
-      startTime: markOptions?.startTime ?? getCurrentTimeStamp(),
+      startTime: markOptions?.startTime ?? now(),
       duration: 0,
     });
 
@@ -73,7 +75,7 @@ export const PerformanceMark: typeof PerformanceMarkTemplate =
   ) {
     this.__entryType = 'mark';
     this.__name = markName;
-    this.__startTime = markOptions?.startTime ?? getCurrentTimeStamp();
+    this.__startTime = markOptions?.startTime ?? now();
     this.__duration = 0;
 
     this.__detail = markOptions?.detail ?? null;

packages/react-native/src/private/webapis/performance/internals/Utilities.js

@@ -57,7 +57,7 @@ export type PerformanceObserverInit = {
 
 export interface Spec extends TurboModule {
   readonly now: () => number;
-  readonly timeOrigin?: () => number;
+  readonly timeOrigin: () => number;
 
   readonly reportMark: (
     name: string,
@@ -107,4 +107,6 @@ export interface Spec extends TurboModule {
   readonly clearEventCountsForTesting: () => void;
 }
 
-export default TurboModuleRegistry.get<Spec>('NativePerformanceCxx') as ?Spec;
+export default TurboModuleRegistry.getEnforcing<Spec>(
+  'NativePerformanceCxx',
+) as Spec;