Cleanup enableEagerAlternateStateNodeCleanup feature flag

packages/react-reconciler/src/ReactFiberCommitWork.js

@@ -60,7 +60,6 @@ import {
   enableComponentPerformanceTrack,
   enableViewTransition,
   enableFragmentRefs,
-  enableEagerAlternateStateNodeCleanup,
   enableDefaultTransitionIndicator,
 } from 'shared/ReactFeatureFlags';
 import {
@@ -2235,17 +2234,15 @@ function commitMutationEffectsOnFiber(
           }
         }
       } else {
-        if (enableEagerAlternateStateNodeCleanup) {
-          if (supportsPersistence) {
-            if (finishedWork.alternate !== null) {
-              // `finishedWork.alternate.stateNode` is pointing to a stale shadow
-              // node at this point, retaining it and its subtree. To reclaim
-              // memory, point `alternate.stateNode` to new shadow node. This
-              // prevents shadow node from staying in memory longer than it
-              // needs to. The correct behaviour of this is checked by test in
-              // React Native: ShadowNodeReferenceCounter-itest.js#L150
-              finishedWork.alternate.stateNode = finishedWork.stateNode;
-            }
+        if (supportsPersistence) {
+          if (finishedWork.alternate !== null) {
+            // `finishedWork.alternate.stateNode` is pointing to a stale shadow
+            // node at this point, retaining it and its subtree. To reclaim
+            // memory, point `alternate.stateNode` to new shadow node. This
+            // prevents shadow node from staying in memory longer than it
+            // needs to. The correct behaviour of this is checked by test in
+            // React Native: ShadowNodeReferenceCounter-itest.js#L150
+            finishedWork.alternate.stateNode = finishedWork.stateNode;
           }
         }
       }

packages/shared/ReactFeatureFlags.js

@@ -129,8 +129,6 @@ export const alwaysThrottleRetries: boolean = true;
 
 export const passChildrenWhenCloningPersistedNodes: boolean = false;
 
-export const enableEagerAlternateStateNodeCleanup: boolean = true;
-
 /**
  * Enables an expiration time for retry lanes to avoid starvation.
  */

packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js

@@ -20,7 +20,6 @@
 export const alwaysThrottleRetries = __VARIANT__;
 export const enableObjectFiber = __VARIANT__;
 export const enableHiddenSubtreeInsertionEffectCleanup = __VARIANT__;
-export const enableEagerAlternateStateNodeCleanup = __VARIANT__;
 export const passChildrenWhenCloningPersistedNodes = __VARIANT__;
 export const renameElementSymbol = __VARIANT__;
 export const enableFragmentRefs = __VARIANT__;

packages/shared/forks/ReactFeatureFlags.native-fb.js

@@ -22,7 +22,6 @@ export const {
   alwaysThrottleRetries,
   enableHiddenSubtreeInsertionEffectCleanup,
   enableObjectFiber,
-  enableEagerAlternateStateNodeCleanup,
   passChildrenWhenCloningPersistedNodes,
   renameElementSymbol,
   enableFragmentRefs,

packages/shared/forks/ReactFeatureFlags.native-oss.js

@@ -45,7 +45,6 @@ export const enablePerformanceIssueReporting: boolean = false;
 export const enableSchedulingProfiler: boolean =
   !enableComponentPerformanceTrack && __PROFILE__;
 export const enableScopeAPI: boolean = false;
-export const enableEagerAlternateStateNodeCleanup: boolean = true;
 export const enableSuspenseAvoidThisFallback: boolean = false;
 export const enableSuspenseCallback: boolean = false;
 export const enableTaint: boolean = true;

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -58,7 +58,6 @@ export const disableClientCache: boolean = true;
 export const enableInfiniteRenderLoopDetection: boolean = false;
 
 export const renameElementSymbol: boolean = true;
-export const enableEagerAlternateStateNodeCleanup: boolean = true;
 
 export const enableYieldingBeforePassive: boolean = true;
 

packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js

@@ -42,7 +42,6 @@ export const enableSchedulingProfiler = __PROFILE__;
 export const enableComponentPerformanceTrack = false;
 export const enablePerformanceIssueReporting = false;
 export const enableScopeAPI = false;
-export const enableEagerAlternateStateNodeCleanup = true;
 export const enableSuspenseAvoidThisFallback = false;
 export const enableSuspenseCallback = false;
 export const enableTaint = true;

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -64,7 +64,6 @@ export const disableLegacyMode: boolean = true;
 export const renameElementSymbol: boolean = false;
 
 export const enableObjectFiber: boolean = false;
-export const enableEagerAlternateStateNodeCleanup: boolean = true;
 
 export const enableHydrationLaneScheduling: boolean = true;
 

packages/shared/forks/ReactFeatureFlags.www.js

@@ -100,8 +100,6 @@ export const enableReactTestRendererWarning: boolean = false;
 
 export const disableLegacyMode: boolean = true;
 
-export const enableEagerAlternateStateNodeCleanup: boolean = true;
-
 export const enableGestureTransition: boolean = false;
 
 export const enableSuspenseyImages: boolean = false;