Clean up legacy feature flags for event loop (#47565)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/47565

Changelog: [internal]

We unified the feature flags for the event loop in https://github.com/facebook/react-native/pull/47084, but we left the legacy flags defined for temporary backwards compatibility.

We don't need that anymore, so we can clean them up.

Reviewed By: fabriziocucci

Differential Revision: D65606068

fbshipit-source-id: 403c278cef2afc8eddf07592d88cadc58765f660

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

@@ -26,18 +26,10 @@ const isEventLoopEnabled = (() => {
     return false;
   }
 
-  if (NativeReactNativeFeatureFlags.disableEventLoopOnBridgeless == null) {
-    // Flags not unified yet
-    return (
-      ReactNativeFeatureFlags.useModernRuntimeScheduler() &&
-      ReactNativeFeatureFlags.enableMicrotasks()
-    );
-  } else {
-    return (
-      ReactNativeFeatureFlags.enableBridgelessArchitecture() &&
-      !ReactNativeFeatureFlags.disableEventLoopOnBridgeless()
-    );
-  }
+  return (
+    ReactNativeFeatureFlags.enableBridgelessArchitecture() &&
+    !ReactNativeFeatureFlags.disableEventLoopOnBridgeless()
+  );
 })();
 
 // In bridgeless mode, timers are host functions installed from cpp.

packages/react-native/ReactCommon/react/nativemodule/featureflags/NativeReactNativeFeatureFlags.cpp

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<1626340cbb5cc8958d6b16c9b717e91e>>
+ * @generated SignedSource<<def34bae6aeac9fbb98d2e3a89ffde32>>
  */
 
 /**
@@ -54,13 +54,6 @@ bool NativeReactNativeFeatureFlags::allowRecursiveCommitsWithSynchronousMountOnA
   return ReactNativeFeatureFlags::allowRecursiveCommitsWithSynchronousMountOnAndroid();
 }
 
-bool NativeReactNativeFeatureFlags::batchRenderingUpdatesInEventLoop(
-    jsi::Runtime& /*runtime*/) {
-  // This flag is configured with `skipNativeAPI: true`.
-  // TODO(T204838867): Implement support for optional methods in C++ TM codegen and remove the method definition altogether.
-  return false;
-}
-
 bool NativeReactNativeFeatureFlags::completeReactInstanceCreationOnBgThreadOnAndroid(
     jsi::Runtime& /*runtime*/) {
   return ReactNativeFeatureFlags::completeReactInstanceCreationOnBgThreadOnAndroid();
@@ -151,13 +144,6 @@ bool NativeReactNativeFeatureFlags::enableLongTaskAPI(
   return ReactNativeFeatureFlags::enableLongTaskAPI();
 }
 
-bool NativeReactNativeFeatureFlags::enableMicrotasks(
-    jsi::Runtime& /*runtime*/) {
-  // This flag is configured with `skipNativeAPI: true`.
-  // TODO(T204838867): Implement support for optional methods in C++ TM codegen and remove the method definition altogether.
-  return false;
-}
-
 bool NativeReactNativeFeatureFlags::enableNewBackgroundAndBorderDrawables(
     jsi::Runtime& /*runtime*/) {
   return ReactNativeFeatureFlags::enableNewBackgroundAndBorderDrawables();
@@ -258,13 +244,6 @@ bool NativeReactNativeFeatureFlags::useImmediateExecutorInAndroidBridgeless(
   return ReactNativeFeatureFlags::useImmediateExecutorInAndroidBridgeless();
 }
 
-bool NativeReactNativeFeatureFlags::useModernRuntimeScheduler(
-    jsi::Runtime& /*runtime*/) {
-  // This flag is configured with `skipNativeAPI: true`.
-  // TODO(T204838867): Implement support for optional methods in C++ TM codegen and remove the method definition altogether.
-  return false;
-}
-
 bool NativeReactNativeFeatureFlags::useNativeViewConfigsInBridgelessMode(
     jsi::Runtime& /*runtime*/) {
   return ReactNativeFeatureFlags::useNativeViewConfigsInBridgelessMode();

packages/react-native/ReactCommon/react/nativemodule/featureflags/NativeReactNativeFeatureFlags.h

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<c283f40e36ee19d1f7d5d9aac4747e33>>
+ * @generated SignedSource<<a31d80cd12e1705dc076068e64d36a01>>
  */
 
 /**
@@ -41,8 +41,6 @@ class NativeReactNativeFeatureFlags
 
   bool allowRecursiveCommitsWithSynchronousMountOnAndroid(jsi::Runtime& runtime);
 
-  bool batchRenderingUpdatesInEventLoop(jsi::Runtime& runtime);
-
   bool completeReactInstanceCreationOnBgThreadOnAndroid(jsi::Runtime& runtime);
 
   bool disableEventLoopOnBridgeless(jsi::Runtime& runtime);
@@ -79,8 +77,6 @@ class NativeReactNativeFeatureFlags
 
   bool enableLongTaskAPI(jsi::Runtime& runtime);
 
-  bool enableMicrotasks(jsi::Runtime& runtime);
-
   bool enableNewBackgroundAndBorderDrawables(jsi::Runtime& runtime);
 
   bool enablePreciseSchedulingForPremountItemsOnAndroid(jsi::Runtime& runtime);
@@ -121,8 +117,6 @@ class NativeReactNativeFeatureFlags
 
   bool useImmediateExecutorInAndroidBridgeless(jsi::Runtime& runtime);
 
-  bool useModernRuntimeScheduler(jsi::Runtime& runtime);
-
   bool useNativeViewConfigsInBridgelessMode(jsi::Runtime& runtime);
 
   bool useOptimisedViewPreallocationOnAndroid(jsi::Runtime& runtime);

packages/react-native/scripts/featureflags/ReactNativeFeatureFlags.config.js

@@ -63,16 +63,6 @@ const definitions: FeatureFlagDefinitions = {
         purpose: 'experimentation',
       },
     },
-    batchRenderingUpdatesInEventLoop: {
-      defaultValue: false,
-      metadata: {
-        description:
-          'When enabled, the RuntimeScheduler processing the event loop will batch all rendering updates and dispatch them together at the end of each iteration of the loop.',
-        purpose: 'release',
-      },
-      // We're preparing to clean up this feature flag.
-      skipNativeAPI: true,
-    },
     completeReactInstanceCreationOnBgThreadOnAndroid: {
       defaultValue: false,
       metadata: {
@@ -223,16 +213,6 @@ const definitions: FeatureFlagDefinitions = {
         purpose: 'release',
       },
     },
-    enableMicrotasks: {
-      defaultValue: false,
-      metadata: {
-        description:
-          'Enables the use of microtasks in Hermes (scheduling) and RuntimeScheduler (execution).',
-        purpose: 'release',
-      },
-      // We're preparing to clean up this feature flag.
-      skipNativeAPI: true,
-    },
     enableNewBackgroundAndBorderDrawables: {
       defaultValue: false,
       metadata: {
@@ -406,16 +386,6 @@ const definitions: FeatureFlagDefinitions = {
         purpose: 'experimentation',
       },
     },
-    useModernRuntimeScheduler: {
-      defaultValue: false,
-      metadata: {
-        description:
-          'When enabled, it uses the modern fork of RuntimeScheduler that allows scheduling tasks with priorities from any thread.',
-        purpose: 'release',
-      },
-      // We're preparing to clean up this feature flag.
-      skipNativeAPI: true,
-    },
     useNativeViewConfigsInBridgelessMode: {
       defaultValue: false,
       metadata: {

packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<fc2fed53108032e45071d0486a5db4a7>>
+ * @generated SignedSource<<d01ef9b03c2a4aac3a5ca77dc25ec7c3>>
  * @flow strict
  */
 
@@ -53,7 +53,6 @@ export type ReactNativeFeatureFlags = {
   commonTestFlag: Getter<boolean>,
   commonTestFlagWithoutNativeImplementation: Getter<boolean>,
   allowRecursiveCommitsWithSynchronousMountOnAndroid: Getter<boolean>,
-  batchRenderingUpdatesInEventLoop: Getter<boolean>,
   completeReactInstanceCreationOnBgThreadOnAndroid: Getter<boolean>,
   disableEventLoopOnBridgeless: Getter<boolean>,
   disableMountItemReorderingAndroid: Getter<boolean>,
@@ -72,7 +71,6 @@ export type ReactNativeFeatureFlags = {
   enableLayoutAnimationsOnAndroid: Getter<boolean>,
   enableLayoutAnimationsOnIOS: Getter<boolean>,
   enableLongTaskAPI: Getter<boolean>,
-  enableMicrotasks: Getter<boolean>,
   enableNewBackgroundAndBorderDrawables: Getter<boolean>,
   enablePreciseSchedulingForPremountItemsOnAndroid: Getter<boolean>,
   enablePropsUpdateReconciliationAndroid: Getter<boolean>,
@@ -93,7 +91,6 @@ export type ReactNativeFeatureFlags = {
   useAlwaysAvailableJSErrorHandling: Getter<boolean>,
   useFabricInterop: Getter<boolean>,
   useImmediateExecutorInAndroidBridgeless: Getter<boolean>,
-  useModernRuntimeScheduler: Getter<boolean>,
   useNativeViewConfigsInBridgelessMode: Getter<boolean>,
   useOptimisedViewPreallocationOnAndroid: Getter<boolean>,
   useOptimizedEventBatchingOnAndroid: Getter<boolean>,
@@ -199,10 +196,6 @@ export const commonTestFlagWithoutNativeImplementation: Getter<boolean> = create
  * Adds support for recursively processing commits that mount synchronously (Android only).
  */
 export const allowRecursiveCommitsWithSynchronousMountOnAndroid: Getter<boolean> = createNativeFlagGetter('allowRecursiveCommitsWithSynchronousMountOnAndroid', false);
-/**
- * When enabled, the RuntimeScheduler processing the event loop will batch all rendering updates and dispatch them together at the end of each iteration of the loop.
- */
-export const batchRenderingUpdatesInEventLoop: Getter<boolean> = createNativeFlagGetter('batchRenderingUpdatesInEventLoop', false);
 /**
  * Do not wait for a main-thread dispatch to complete init to start executing work on the JS thread on Android
  */
@@ -275,10 +268,6 @@ export const enableLayoutAnimationsOnIOS: Getter<boolean> = createNativeFlagGett
  * Enables the reporting of long tasks through `PerformanceObserver`. Only works if the event loop is enabled.
  */
 export const enableLongTaskAPI: Getter<boolean> = createNativeFlagGetter('enableLongTaskAPI', false);
-/**
- * Enables the use of microtasks in Hermes (scheduling) and RuntimeScheduler (execution).
- */
-export const enableMicrotasks: Getter<boolean> = createNativeFlagGetter('enableMicrotasks', false);
 /**
  * Use BackgroundDrawable and BorderDrawable instead of CSSBackgroundDrawable
  */
@@ -359,10 +348,6 @@ export const useFabricInterop: Getter<boolean> = createNativeFlagGetter('useFabr
  * Invoke callbacks immediately on the ReactInstance rather than going through a background thread for synchronization
  */
 export const useImmediateExecutorInAndroidBridgeless: Getter<boolean> = createNativeFlagGetter('useImmediateExecutorInAndroidBridgeless', false);
-/**
- * When enabled, it uses the modern fork of RuntimeScheduler that allows scheduling tasks with priorities from any thread.
- */
-export const useModernRuntimeScheduler: Getter<boolean> = createNativeFlagGetter('useModernRuntimeScheduler', false);
 /**
  * When enabled, the native view configs are used in bridgeless mode.
  */

packages/react-native/src/private/featureflags/specs/NativeReactNativeFeatureFlags.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<53510b80964a952f0fc4ed97a6d59386>>
+ * @generated SignedSource<<a1cbc6a91551de0008c070adb5d805fd>>
  * @flow strict
  */
 
@@ -26,7 +26,6 @@ export interface Spec extends TurboModule {
   +commonTestFlag?: () => boolean;
   +commonTestFlagWithoutNativeImplementation?: () => boolean;
   +allowRecursiveCommitsWithSynchronousMountOnAndroid?: () => boolean;
-  +batchRenderingUpdatesInEventLoop?: () => boolean;
   +completeReactInstanceCreationOnBgThreadOnAndroid?: () => boolean;
   +disableEventLoopOnBridgeless?: () => boolean;
   +disableMountItemReorderingAndroid?: () => boolean;
@@ -45,7 +44,6 @@ export interface Spec extends TurboModule {
   +enableLayoutAnimationsOnAndroid?: () => boolean;
   +enableLayoutAnimationsOnIOS?: () => boolean;
   +enableLongTaskAPI?: () => boolean;
-  +enableMicrotasks?: () => boolean;
   +enableNewBackgroundAndBorderDrawables?: () => boolean;
   +enablePreciseSchedulingForPremountItemsOnAndroid?: () => boolean;
   +enablePropsUpdateReconciliationAndroid?: () => boolean;
@@ -66,7 +64,6 @@ export interface Spec extends TurboModule {
   +useAlwaysAvailableJSErrorHandling?: () => boolean;
   +useFabricInterop?: () => boolean;
   +useImmediateExecutorInAndroidBridgeless?: () => boolean;
-  +useModernRuntimeScheduler?: () => boolean;
   +useNativeViewConfigsInBridgelessMode?: () => boolean;
   +useOptimisedViewPreallocationOnAndroid?: () => boolean;
   +useOptimizedEventBatchingOnAndroid?: () => boolean;