Remove unstableAvoidThisFallback from OSS (#22884)

* avoidThisFallbackFlag

* avoidThisFallback flag

* missed a spot

* rm gating

packages/react-reconciler/src/ReactFiberBeginWork.new.js

@@ -29,6 +29,7 @@ import type {
   SpawnedCachePool,
 } from './ReactFiberCacheComponent.new';
 import type {UpdateQueue} from './ReactUpdateQueue.new';
+import {enableSuspenseAvoidThisFallback} from 'shared/ReactFeatureFlags';
 
 import checkPropTypes from 'shared/checkPropTypes';
 import {
@@ -1997,7 +1998,10 @@ function updateSuspenseComponent(current, workInProgress, renderLanes) {
       // Mark this subtree context as having at least one invisible parent that could
       // handle the fallback state.
       // Avoided boundaries are not considered since they cannot handle preferred fallback states.
-      if (nextProps.unstable_avoidThisFallback !== true) {
+      if (
+        !enableSuspenseAvoidThisFallback ||
+        nextProps.unstable_avoidThisFallback !== true
+      ) {
         suspenseContext = addSubtreeSuspenseContext(
           suspenseContext,
           InvisibleParentSuspenseContext,

packages/react-reconciler/src/ReactFiberBeginWork.old.js

@@ -29,6 +29,7 @@ import type {
   SpawnedCachePool,
 } from './ReactFiberCacheComponent.old';
 import type {UpdateQueue} from './ReactUpdateQueue.old';
+import {enableSuspenseAvoidThisFallback} from 'shared/ReactFeatureFlags';
 
 import checkPropTypes from 'shared/checkPropTypes';
 import {
@@ -1997,7 +1998,10 @@ function updateSuspenseComponent(current, workInProgress, renderLanes) {
       // Mark this subtree context as having at least one invisible parent that could
       // handle the fallback state.
       // Avoided boundaries are not considered since they cannot handle preferred fallback states.
-      if (nextProps.unstable_avoidThisFallback !== true) {
+      if (
+        !enableSuspenseAvoidThisFallback ||
+        nextProps.unstable_avoidThisFallback !== true
+      ) {
         suspenseContext = addSubtreeSuspenseContext(
           suspenseContext,
           InvisibleParentSuspenseContext,

packages/react-reconciler/src/ReactFiberCompleteWork.new.js

@@ -29,6 +29,7 @@ import type {
 import type {SuspenseContext} from './ReactFiberSuspenseContext.new';
 import type {OffscreenState} from './ReactFiberOffscreenComponent';
 import type {Cache, SpawnedCachePool} from './ReactFiberCacheComponent.new';
+import {enableSuspenseAvoidThisFallback} from 'shared/ReactFeatureFlags';
 
 import {resetWorkInProgressVersions as resetMutableSourceWorkInProgressVersions} from './ReactMutableSource.new';
 
@@ -1154,7 +1155,8 @@ function completeWork(
           // should be able to immediately restart from within throwException.
           const hasInvisibleChildContext =
             current === null &&
-            workInProgress.memoizedProps.unstable_avoidThisFallback !== true;
+            (workInProgress.memoizedProps.unstable_avoidThisFallback !== true ||
+              !enableSuspenseAvoidThisFallback);
           if (
             hasInvisibleChildContext ||
             hasSuspenseContext(

packages/react-reconciler/src/ReactFiberCompleteWork.old.js

@@ -29,6 +29,7 @@ import type {
 import type {SuspenseContext} from './ReactFiberSuspenseContext.old';
 import type {OffscreenState} from './ReactFiberOffscreenComponent';
 import type {Cache, SpawnedCachePool} from './ReactFiberCacheComponent.old';
+import {enableSuspenseAvoidThisFallback} from 'shared/ReactFeatureFlags';
 
 import {resetWorkInProgressVersions as resetMutableSourceWorkInProgressVersions} from './ReactMutableSource.old';
 
@@ -1154,7 +1155,8 @@ function completeWork(
           // should be able to immediately restart from within throwException.
           const hasInvisibleChildContext =
             current === null &&
-            workInProgress.memoizedProps.unstable_avoidThisFallback !== true;
+            (workInProgress.memoizedProps.unstable_avoidThisFallback !== true ||
+              !enableSuspenseAvoidThisFallback);
           if (
             hasInvisibleChildContext ||
             hasSuspenseContext(

packages/react-reconciler/src/ReactFiberSuspenseComponent.new.js

@@ -13,6 +13,7 @@ import type {SuspenseInstance} from './ReactFiberHostConfig';
 import type {Lane} from './ReactFiberLane.new';
 import type {TreeContext} from './ReactFiberTreeContext.new';
 
+import {enableSuspenseAvoidThisFallback} from 'shared/ReactFeatureFlags';
 import {SuspenseComponent, SuspenseListComponent} from './ReactWorkTags';
 import {NoFlags, DidCapture} from './ReactFiberFlags';
 import {
@@ -81,7 +82,10 @@ export function shouldCaptureSuspense(
   }
   const props = workInProgress.memoizedProps;
   // Regular boundaries always capture.
-  if (props.unstable_avoidThisFallback !== true) {
+  if (
+    !enableSuspenseAvoidThisFallback ||
+    props.unstable_avoidThisFallback !== true
+  ) {
     return true;
   }
   // If it's a boundary we should avoid, then we prefer to bubble up to the

packages/react-reconciler/src/ReactFiberSuspenseComponent.old.js

@@ -13,6 +13,7 @@ import type {SuspenseInstance} from './ReactFiberHostConfig';
 import type {Lane} from './ReactFiberLane.old';
 import type {TreeContext} from './ReactFiberTreeContext.old';
 
+import {enableSuspenseAvoidThisFallback} from 'shared/ReactFeatureFlags';
 import {SuspenseComponent, SuspenseListComponent} from './ReactWorkTags';
 import {NoFlags, DidCapture} from './ReactFiberFlags';
 import {
@@ -81,7 +82,10 @@ export function shouldCaptureSuspense(
   }
   const props = workInProgress.memoizedProps;
   // Regular boundaries always capture.
-  if (props.unstable_avoidThisFallback !== true) {
+  if (
+    !enableSuspenseAvoidThisFallback ||
+    props.unstable_avoidThisFallback !== true
+  ) {
     return true;
   }
   // If it's a boundary we should avoid, then we prefer to bubble up to the

packages/react-reconciler/src/__tests__/ReactSuspenseList-test.js

@@ -688,7 +688,7 @@ describe('ReactSuspenseList', () => {
     );
   });
 
-  // @gate enableSuspenseList
+  // @gate enableSuspenseList && enableSuspenseAvoidThisFallback
   it('avoided boundaries can be coordinate with SuspenseList', async () => {
     const A = createAsyncText('A');
     const B = createAsyncText('B');

packages/react-reconciler/src/__tests__/ReactSuspenseWithNoopRenderer-test.js

@@ -2234,7 +2234,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     expect(ReactNoop).toMatchRenderedOutput('Loading...');
   });
 
-  // @gate enableCache
+  // @gate enableCache && enableSuspenseAvoidThisFallback
   it('shows the parent fallback if the inner fallback should be avoided', async () => {
     function Foo({showC}) {
       Scheduler.unstable_yieldValue('Foo');
@@ -2372,7 +2372,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     expect(ReactNoop.getChildren()).toEqual([span('A'), span('Loading B...')]);
   });
 
-  // @gate enableCache
+  // @gate enableCache && enableSuspenseAvoidThisFallback
   it('keeps showing an avoided parent fallback if it is already showing', async () => {
     function Foo({showB}) {
       Scheduler.unstable_yieldValue('Foo');
@@ -2865,7 +2865,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     });
   });
 
-  // @gate enableCache
+  // @gate enableCache && enableSuspenseAvoidThisFallback
   it('do not show placeholder when updating an avoided boundary with startTransition', async () => {
     function App({page}) {
       return (
@@ -2909,7 +2909,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {
     );
   });
 
-  // @gate enableCache
+  // @gate enableCache && enableSuspenseAvoidThisFallback
   it('do not show placeholder when mounting an avoided boundary with startTransition', async () => {
     function App({page}) {
       return (

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

@@ -40,7 +40,7 @@ export const disableModulePatternComponents = true;
 export const warnUnstableRenderSubtreeIntoContainer = false;
 export const warnAboutSpreadingKeyToJSX = false;
 export const warnOnSubscriptionInsideStartTransition = false;
-export const enableSuspenseAvoidThisFallback = false;
+export const enableSuspenseAvoidThisFallback = true;
 export const enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay = true;
 export const enableClientRenderFallbackOnHydrationMismatch = true;
 export const enableComponentStackLocations = true;

packages/shared/forks/ReactFeatureFlags.testing.www.js

@@ -40,7 +40,7 @@ export const disableModulePatternComponents = true;
 export const warnUnstableRenderSubtreeIntoContainer = false;
 export const warnAboutSpreadingKeyToJSX = false;
 export const warnOnSubscriptionInsideStartTransition = false;
-export const enableSuspenseAvoidThisFallback = false;
+export const enableSuspenseAvoidThisFallback = true;
 export const enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay = true;
 export const enableClientRenderFallbackOnHydrationMismatch = true;
 export const enableComponentStackLocations = true;

packages/shared/forks/ReactFeatureFlags.www.js

@@ -50,7 +50,7 @@ export const enableProfilerNestedUpdateScheduledHook =
 export const enableUpdaterTracking = __PROFILE__;
 
 export const enableSuspenseLayoutEffectSemantics = true;
-export const enableSuspenseAvoidThisFallback = false;
+export const enableSuspenseAvoidThisFallback = true;
 
 // Logs additional User Timing API marks for use with an experimental profiling tool.
 export const enableSchedulingProfiler =