{"commit":{"shortRevision":"b2ae9ddb3b","authorEmail":"jkassens@meta.com","authoredAt":"2023-02-27T14:04:02-05:00","authorName":"Jan Kassens","subject":"Cleanup enableSyncDefaultUpdate flag (#26236)","revision":"b2ae9ddb3b497d16a7c27c051da1827d08871138"},"files":[{"path":"packages\/react-art\/src\/__tests__\/ReactART-test.js","status":"M"},{"path":"packages\/react-dom\/src\/__tests__\/ReactDOMNativeEventHeuristic-test.js","status":"M"},{"path":"packages\/react-dom\/src\/__tests__\/ReactDOMServerPartialHydration-test.internal.js","status":"M"},{"path":"packages\/react-dom\/src\/events\/__tests__\/DOMPluginEventSystem-test.internal.js","status":"M"},{"path":"packages\/react-reconciler\/src\/ReactFiber.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactDisableSchedulerTimeoutBasedOnReactExpirationTime-test.internal.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactExpiration-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactFlushSync-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactHooksWithNoopRenderer-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactIncremental-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactIncrementalErrorHandling-test.internal.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactIncrementalReflection-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactIncrementalScheduling-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactIncrementalSideEffects-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactIncrementalUpdates-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactInterleavedUpdates-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactNewContext-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactSchedulerIntegration-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactSuspense-test.internal.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactSuspenseList-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactSuspenseWithNoopRenderer-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/useMutableSource-test.internal.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/useMutableSourceHydration-test.js","status":"M"},{"path":"packages\/react-test-renderer\/src\/__tests__\/ReactTestRendererAsync-test.js","status":"M"},{"path":"packages\/react\/src\/__tests__\/ReactProfiler-test.internal.js","status":"M"},{"path":"packages\/react\/src\/__tests__\/ReactProfilerDevToolsIntegration-test.internal.js","status":"M"},{"path":"packages\/shared\/ReactFeatureFlags.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.native-fb.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.native-oss.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.test-renderer.native.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.testing.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.testing.www.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.www.js","status":"M"},{"path":"packages\/use-subscription\/src\/__tests__\/useSubscription-test.js","status":"M"}],"parents":["6ff1733e63fdb948ae973a713741b4526102c73c"],"patch":"diff --git a\/packages\/react-art\/src\/__tests__\/ReactART-test.js b\/packages\/react-art\/src\/__tests__\/ReactART-test.js\nindex 6cc38b47b8..714e19d1cc 100644\n--- a\/packages\/react-art\/src\/__tests__\/ReactART-test.js\n+++ b\/packages\/react-art\/src\/__tests__\/ReactART-test.js\n@@ -33,8 +33,6 @@ const ReactTestRenderer = require('react-test-renderer');\n \n \/\/ Isolate the noop renderer\n jest.resetModules();\n-const ReactNoop = require('react-noop-renderer');\n-const Scheduler = require('scheduler');\n \n let Group;\n let Shape;\n@@ -359,58 +357,6 @@ describe('ReactART', () => {\n doClick(instance);\n expect(onClick2).toBeCalled();\n });\n-\n- \/\/ @gate !enableSyncDefaultUpdates\n- it('can concurrently render with a \"primary\" renderer while sharing context', () => {\n- const CurrentRendererContext = React.createContext(null);\n-\n- function Yield(props) {\n- Scheduler.unstable_yieldValue(props.value);\n- return null;\n- }\n-\n- let ops = [];\n- function LogCurrentRenderer() {\n- return (\n- \n- {currentRenderer => {\n- ops.push(currentRenderer);\n- return null;\n- }}\n- <\/CurrentRendererContext.Consumer>\n- );\n- }\n-\n- \/\/ Using test renderer instead of the DOM renderer here because async\n- \/\/ testing APIs for the DOM renderer don't exist.\n- ReactNoop.render(\n- \n- \n- \n- \n- \n- <\/CurrentRendererContext.Provider>,\n- );\n-\n- expect(Scheduler).toFlushAndYieldThrough(['A']);\n-\n- ReactDOM.render(\n- \n- \n- \n- \n- <\/CurrentRendererContext.Provider>\n- <\/Surface>,\n- container,\n- );\n-\n- expect(ops).toEqual([null, 'ART']);\n-\n- ops = [];\n- expect(Scheduler).toFlushAndYield(['B', 'C']);\n-\n- expect(ops).toEqual(['Test']);\n- });\n });\n \n describe('ReactARTComponents', () => {\ndiff --git a\/packages\/react-dom\/src\/__tests__\/ReactDOMNativeEventHeuristic-test.js b\/packages\/react-dom\/src\/__tests__\/ReactDOMNativeEventHeuristic-test.js\nindex 15605af870..cfdeecf718 100644\n--- a\/packages\/react-dom\/src\/__tests__\/ReactDOMNativeEventHeuristic-test.js\n+++ b\/packages\/react-dom\/src\/__tests__\/ReactDOMNativeEventHeuristic-test.js\n@@ -305,11 +305,7 @@ describe('ReactDOMNativeEventHeuristic-test', () => {\n expect(container.textContent).toEqual('not hovered');\n \n expect(Scheduler).toFlushAndYieldThrough(['hovered']);\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- expect(container.textContent).toEqual('hovered');\n- } else {\n- expect(container.textContent).toEqual('not hovered');\n- }\n+ expect(container.textContent).toEqual('hovered');\n });\n expect(container.textContent).toEqual('hovered');\n });\ndiff --git a\/packages\/react-dom\/src\/__tests__\/ReactDOMServerPartialHydration-test.internal.js b\/packages\/react-dom\/src\/__tests__\/ReactDOMServerPartialHydration-test.internal.js\nindex 3886cfe7f3..0862865f76 100644\n--- a\/packages\/react-dom\/src\/__tests__\/ReactDOMServerPartialHydration-test.internal.js\n+++ b\/packages\/react-dom\/src\/__tests__\/ReactDOMServerPartialHydration-test.internal.js\n@@ -2044,14 +2044,7 @@ describe('ReactDOMServerPartialHydration', () => {\n suspend = true;\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- expect(Scheduler).toFlushAndYieldThrough(['Before', 'After']);\n- } else {\n- expect(Scheduler).toFlushAndYieldThrough(['Before']);\n- \/\/ This took a long time to render.\n- Scheduler.unstable_advanceTime(1000);\n- expect(Scheduler).toFlushAndYield(['After']);\n- }\n+ expect(Scheduler).toFlushAndYieldThrough(['Before', 'After']);\n \n \/\/ This will cause us to skip the second row completely.\n });\ndiff --git a\/packages\/react-dom\/src\/events\/__tests__\/DOMPluginEventSystem-test.internal.js b\/packages\/react-dom\/src\/events\/__tests__\/DOMPluginEventSystem-test.internal.js\nindex 3cad26f326..6202eec7f3 100644\n--- a\/packages\/react-dom\/src\/events\/__tests__\/DOMPluginEventSystem-test.internal.js\n+++ b\/packages\/react-dom\/src\/events\/__tests__\/DOMPluginEventSystem-test.internal.js\n@@ -1965,13 +1965,9 @@ describe('DOMPluginEventSystem', () => {\n log.length = 0;\n \n \/\/ Increase counter\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n \/\/ Yield before committing\n expect(Scheduler).toFlushAndYieldThrough(['Test']);\n \ndiff --git a\/packages\/react-reconciler\/src\/ReactFiber.js b\/packages\/react-reconciler\/src\/ReactFiber.js\nindex b5c89a56df..e3fc26659c 100644\n--- a\/packages\/react-reconciler\/src\/ReactFiber.js\n+++ b\/packages\/react-reconciler\/src\/ReactFiber.js\n@@ -33,7 +33,6 @@ import {\n enableProfilerTimer,\n enableScopeAPI,\n enableLegacyHidden,\n- enableSyncDefaultUpdates,\n allowConcurrentByDefault,\n enableTransitionTracing,\n enableDebugTracing,\n@@ -459,11 +458,9 @@ export function createHostRootFiber(\n mode |= StrictLegacyMode | StrictEffectsMode;\n }\n if (\n- \/\/ We only use this flag for our repo tests to check both behaviors.\n- \/\/ TODO: Flip this flag and rename it something like \"forceConcurrentByDefaultForTesting\"\n- !enableSyncDefaultUpdates ||\n \/\/ Only for internal experiments.\n- (allowConcurrentByDefault && concurrentUpdatesByDefaultOverride)\n+ allowConcurrentByDefault &&\n+ concurrentUpdatesByDefaultOverride\n ) {\n mode |= ConcurrentUpdatesByDefaultMode;\n }\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactDisableSchedulerTimeoutBasedOnReactExpirationTime-test.internal.js b\/packages\/react-reconciler\/src\/__tests__\/ReactDisableSchedulerTimeoutBasedOnReactExpirationTime-test.internal.js\nindex 0060891234..2d6828eca1 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactDisableSchedulerTimeoutBasedOnReactExpirationTime-test.internal.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactDisableSchedulerTimeoutBasedOnReactExpirationTime-test.internal.js\n@@ -63,13 +63,9 @@ describe('ReactSuspenseList', () => {\n root.render();\n expect(Scheduler).toFlushAndYield([]);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield([\n 'Suspend! [A]',\n 'Suspend! [B]',\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactExpiration-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactExpiration-test.js\nindex 7b96efc2b9..fb041f948f 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactExpiration-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactExpiration-test.js\n@@ -115,13 +115,9 @@ describe('ReactExpiration', () => {\n }\n \n it('increases priority of updates as time progresses', () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n expect(ReactNoop).toMatchRenderedOutput(null);\n \n@@ -162,13 +158,9 @@ describe('ReactExpiration', () => {\n \n \/\/ First, show what happens for updates in two separate events.\n \/\/ Schedule an update.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ Advance the timer.\n Scheduler.unstable_advanceTime(2000);\n \/\/ Partially flush the first update, then interrupt it.\n@@ -223,13 +215,9 @@ describe('ReactExpiration', () => {\n \n \/\/ First, show what happens for updates in two separate events.\n \/\/ Schedule an update.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ Advance the timer.\n Scheduler.unstable_advanceTime(2000);\n \/\/ Partially flush the first update, then interrupt it.\n@@ -301,13 +289,9 @@ describe('ReactExpiration', () => {\n }\n \n \/\/ Initial mount\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield([\n 'initial [A] [render]',\n 'initial [B] [render]',\n@@ -320,13 +304,9 @@ describe('ReactExpiration', () => {\n ]);\n \n \/\/ Partial update\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- subscribers.forEach(s => s.setState({text: '1'}));\n- });\n- } else {\n+ React.startTransition(() => {\n subscribers.forEach(s => s.setState({text: '1'}));\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n '1 [A] [render]',\n '1 [B] [render]',\n@@ -358,13 +338,9 @@ describe('ReactExpiration', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['A']);\n expect(Scheduler).toFlushAndYieldThrough(['B']);\n@@ -392,13 +368,9 @@ describe('ReactExpiration', () => {\n <\/>\n );\n }\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['A']);\n expect(Scheduler).toFlushAndYieldThrough(['B']);\n@@ -426,13 +398,9 @@ describe('ReactExpiration', () => {\n \/\/ current time.\n ReactNoop = require('react-noop-renderer');\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render('Hi');\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render('Hi');\n- }\n+ });\n \n \/\/ The update should not have expired yet.\n flushNextRenderIfExpired();\n@@ -455,13 +423,9 @@ describe('ReactExpiration', () => {\n \/\/ Before scheduling an update, advance the current time.\n Scheduler.unstable_advanceTime(10000);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render('Hi');\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render('Hi');\n- }\n+ });\n flushNextRenderIfExpired();\n expect(Scheduler).toHaveYielded([]);\n expect(ReactNoop).toMatchRenderedOutput(null);\n@@ -504,13 +468,9 @@ describe('ReactExpiration', () => {\n \n \/\/ First demonstrate what happens when there's no starvation\n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- updateNormalPri();\n- });\n- } else {\n+ React.startTransition(() => {\n updateNormalPri();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Sync pri: 0']);\n updateSyncPri();\n expect(Scheduler).toHaveYielded(['Sync pri: 1', 'Normal pri: 0']);\n@@ -528,13 +488,9 @@ describe('ReactExpiration', () => {\n \n \/\/ Do the same thing, but starve the first update\n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- updateNormalPri();\n- });\n- } else {\n+ React.startTransition(() => {\n updateNormalPri();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Sync pri: 1']);\n \n \/\/ This time, a lot of time has elapsed since the normal pri update\n@@ -690,13 +646,9 @@ describe('ReactExpiration', () => {\n expect(root).toMatchRenderedOutput('A0BC');\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield([\n 'Suspend! [A1]',\n 'B',\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactFlushSync-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactFlushSync-test.js\nindex 5802253e1c..2ec6aa4889 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactFlushSync-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactFlushSync-test.js\n@@ -41,13 +41,9 @@ describe('ReactFlushSync', () => {\n \n const root = ReactNoop.createRoot();\n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n \/\/ This will yield right before the passive effect fires\n expect(Scheduler).toFlushUntilNextPaint(['0, 0']);\n \ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactHooksWithNoopRenderer-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactHooksWithNoopRenderer-test.js\nindex 2455f51965..6bfd7ae16f 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactHooksWithNoopRenderer-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactHooksWithNoopRenderer-test.js\n@@ -167,15 +167,10 @@ describe('ReactHooksWithNoopRenderer', () => {\n \n \/\/ Schedule some updates\n act(() => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- counter.current.updateCount(1);\n- counter.current.updateCount(count => count + 10);\n- });\n- } else {\n+ React.startTransition(() => {\n counter.current.updateCount(1);\n counter.current.updateCount(count => count + 10);\n- }\n+ });\n \n \/\/ Partially flush without committing\n expect(Scheduler).toFlushAndYieldThrough(['Count: 11']);\n@@ -694,24 +689,16 @@ describe('ReactHooksWithNoopRenderer', () => {\n expect(Scheduler).toFlushAndYield([0]);\n expect(root).toMatchRenderedOutput();\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend!']);\n expect(root).toMatchRenderedOutput();\n \n \/\/ Rendering again should suspend again.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend!']);\n });\n \n@@ -757,38 +744,25 @@ describe('ReactHooksWithNoopRenderer', () => {\n expect(root).toMatchRenderedOutput();\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- setLabel('B');\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n setLabel('B');\n- }\n+ });\n \n expect(Scheduler).toFlushAndYield(['Suspend!']);\n expect(root).toMatchRenderedOutput();\n \n \/\/ Rendering again should suspend again.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend!']);\n \n \/\/ Flip the signal back to \"cancel\" the update. However, the update to\n \/\/ label should still proceed. It shouldn't have been dropped.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['B:0']);\n expect(root).toMatchRenderedOutput();\n });\n@@ -823,13 +797,9 @@ describe('ReactHooksWithNoopRenderer', () => {\n ReactNoop.discreteUpdates(() => {\n setRow(5);\n });\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- setRow(20);\n- });\n- } else {\n+ React.startTransition(() => {\n setRow(20);\n- }\n+ });\n });\n expect(Scheduler).toHaveYielded(['Up', 'Down']);\n expect(root).toMatchRenderedOutput();\n@@ -1362,13 +1332,9 @@ describe('ReactHooksWithNoopRenderer', () => {\n ]);\n \n \/\/ Schedule another update for children, and partially process it.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- setChildStates.forEach(setChildState => setChildState(2));\n- });\n- } else {\n+ React.startTransition(() => {\n setChildStates.forEach(setChildState => setChildState(2));\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Child one render']);\n \n \/\/ Schedule unmount for the parent that unmounts children with pending update.\n@@ -1674,42 +1640,24 @@ describe('ReactHooksWithNoopRenderer', () => {\n expect(ReactNoop).toMatchRenderedOutput();\n \n \/\/ Rendering again should flush the previous commit's effects\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(, () =>\n- Scheduler.unstable_yieldValue('Sync effect'),\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(, () =>\n Scheduler.unstable_yieldValue('Sync effect'),\n );\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough([\n 'Schedule update [0]',\n 'Count: 0',\n ]);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- expect(ReactNoop).toMatchRenderedOutput();\n- expect(Scheduler).toFlushAndYieldThrough([\n- 'Count: 0',\n- 'Sync effect',\n- 'Schedule update [1]',\n- 'Count: 1',\n- ]);\n- } else {\n- expect(ReactNoop).toMatchRenderedOutput(\n- ,\n- );\n- expect(Scheduler).toFlushAndYieldThrough(['Sync effect']);\n- expect(ReactNoop).toMatchRenderedOutput();\n-\n- ReactNoop.flushPassiveEffects();\n- expect(Scheduler).toHaveYielded(['Schedule update [1]']);\n- expect(Scheduler).toFlushAndYield(['Count: 1']);\n- }\n+ expect(ReactNoop).toMatchRenderedOutput();\n+ expect(Scheduler).toFlushAndYieldThrough([\n+ 'Count: 0',\n+ 'Sync effect',\n+ 'Schedule update [1]',\n+ 'Count: 1',\n+ ]);\n \n expect(ReactNoop).toMatchRenderedOutput();\n });\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactIncremental-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactIncremental-test.js\nindex 47323ffc09..21edc33da1 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactIncremental-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactIncremental-test.js\n@@ -65,17 +65,11 @@ describe('ReactIncremental', () => {\n return [, ];\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(, () =>\n- Scheduler.unstable_yieldValue('callback'),\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(, () =>\n Scheduler.unstable_yieldValue('callback'),\n );\n- }\n+ });\n \/\/ Do one step of work.\n expect(ReactNoop.flushNextYield()).toEqual(['Foo']);\n \n@@ -162,26 +156,18 @@ describe('ReactIncremental', () => {\n ReactNoop.render();\n expect(Scheduler).toFlushAndYield(['Foo', 'Bar', 'Bar']);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ Flush part of the work\n expect(Scheduler).toFlushAndYieldThrough(['Foo', 'Bar']);\n \n \/\/ This will abort the previous work and restart\n ReactNoop.flushSync(() => ReactNoop.render(null));\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n \/\/ Flush part of the new work\n expect(Scheduler).toFlushAndYieldThrough(['Foo', 'Bar']);\n@@ -215,17 +201,7 @@ describe('ReactIncremental', () => {\n ReactNoop.render();\n expect(Scheduler).toFlushWithoutYielding();\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- inst.setState(\n- () => {\n- Scheduler.unstable_yieldValue('setState1');\n- return {text: 'bar'};\n- },\n- () => Scheduler.unstable_yieldValue('callback1'),\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n inst.setState(\n () => {\n Scheduler.unstable_yieldValue('setState1');\n@@ -233,24 +209,14 @@ describe('ReactIncremental', () => {\n },\n () => Scheduler.unstable_yieldValue('callback1'),\n );\n- }\n+ });\n \n \/\/ Flush part of the work\n expect(Scheduler).toFlushAndYieldThrough(['setState1']);\n \n \/\/ This will abort the previous work and restart\n ReactNoop.flushSync(() => ReactNoop.render());\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- inst.setState(\n- () => {\n- Scheduler.unstable_yieldValue('setState2');\n- return {text2: 'baz'};\n- },\n- () => Scheduler.unstable_yieldValue('callback2'),\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n inst.setState(\n () => {\n Scheduler.unstable_yieldValue('setState2');\n@@ -258,7 +224,7 @@ describe('ReactIncremental', () => {\n },\n () => Scheduler.unstable_yieldValue('callback2'),\n );\n- }\n+ });\n \n \/\/ Flush the rest of the work which now includes the low priority\n expect(Scheduler).toFlushAndYield([\n@@ -1878,18 +1844,7 @@ describe('ReactIncremental', () => {\n 'ShowLocale {\"locale\":\"de\"}',\n 'ShowBoth {\"locale\":\"de\"}',\n ]);\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- \n- \n-

\n- \n- <\/div>\n- <\/Intl>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n \n \n@@ -1898,7 +1853,7 @@ describe('ReactIncremental', () => {\n <\/div>\n <\/Intl>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Intl {}']);\n \n ReactNoop.render(\n@@ -2028,22 +1983,7 @@ describe('ReactIncremental', () => {\n }\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- \n- \n- \n- \n- \n- \n- <\/Intl>\n- <\/LegacyHiddenDiv>\n- \n- <\/Intl>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n \n \n@@ -2056,7 +1996,7 @@ describe('ReactIncremental', () => {\n \n <\/Intl>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n 'Intl {}',\n 'ShowLocale {\"locale\":\"fr\"}',\n@@ -2746,13 +2686,9 @@ describe('ReactIncremental', () => {\n return null;\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Parent: 1']);\n \n \/\/ Interrupt at same priority\n@@ -2772,13 +2708,9 @@ describe('ReactIncremental', () => {\n return null;\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Parent: 1']);\n \n \/\/ Interrupt at lower priority\n@@ -2799,13 +2731,9 @@ describe('ReactIncremental', () => {\n return null;\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Parent: 1']);\n \n \/\/ Interrupt at higher priority\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalErrorHandling-test.internal.js b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalErrorHandling-test.internal.js\nindex a5c273b25c..547efa26fa 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalErrorHandling-test.internal.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalErrorHandling-test.internal.js\n@@ -87,23 +87,7 @@ describe('ReactIncrementalErrorHandling', () => {\n throw new Error('oops!');\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- \n- \n- \n- \n- \n- \n- \n- <\/Indirection>\n- <\/Indirection>\n- <\/Indirection>\n- <\/ErrorBoundary>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n \n \n@@ -117,7 +101,7 @@ describe('ReactIncrementalErrorHandling', () => {\n <\/Indirection>\n <\/ErrorBoundary>,\n );\n- }\n+ });\n \n \/\/ Start rendering asynchronously\n expect(Scheduler).toFlushAndYieldThrough([\n@@ -201,23 +185,7 @@ describe('ReactIncrementalErrorHandling', () => {\n throw new Error('oops!');\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- \n- \n- \n- \n- \n- \n- \n- <\/Indirection>\n- <\/Indirection>\n- <\/Indirection>\n- <\/ErrorBoundary>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n \n \n@@ -231,7 +199,7 @@ describe('ReactIncrementalErrorHandling', () => {\n <\/Indirection>\n <\/ErrorBoundary>,\n );\n- }\n+ });\n \n \/\/ Start rendering asynchronously\n expect(Scheduler).toFlushAndYieldThrough([\n@@ -399,17 +367,11 @@ describe('ReactIncrementalErrorHandling', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(, () =>\n- Scheduler.unstable_yieldValue('commit'),\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(, () =>\n Scheduler.unstable_yieldValue('commit'),\n );\n- }\n+ });\n \n \/\/ Render the bad component asynchronously\n expect(Scheduler).toFlushAndYieldThrough(['Parent', 'BadRender']);\n@@ -451,13 +413,9 @@ describe('ReactIncrementalErrorHandling', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n \/\/ Render part of the tree\n expect(Scheduler).toFlushAndYieldThrough(['A', 'B']);\n@@ -592,21 +550,13 @@ describe('ReactIncrementalErrorHandling', () => {\n throw new Error('Hello');\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- \n- \n- <\/ErrorBoundary>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n \n \n <\/ErrorBoundary>,\n );\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['ErrorBoundary render success']);\n expect(ReactNoop).toMatchRenderedOutput(null);\n@@ -781,21 +731,13 @@ describe('ReactIncrementalErrorHandling', () => {\n throw new Error('Hello');\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- \n- \n- <\/RethrowErrorBoundary>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n \n \n <\/RethrowErrorBoundary>,\n );\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['RethrowErrorBoundary render']);\n \n@@ -1875,13 +1817,9 @@ describe('ReactIncrementalErrorHandling', () => {\n }\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n \n \/\/ Render past the component that throws, then yield.\n expect(Scheduler).toFlushAndYieldThrough(['Oops']);\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalReflection-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalReflection-test.js\nindex 45ecb93658..319be4c9f2 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalReflection-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalReflection-test.js\n@@ -63,13 +63,9 @@ describe('ReactIncrementalReflection', () => {\n return ;\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n \/\/ Render part way through but don't yet commit the updates.\n expect(Scheduler).toFlushAndYieldThrough(['componentWillMount: false']);\n@@ -117,13 +113,9 @@ describe('ReactIncrementalReflection', () => {\n \n expect(instances[0]._isMounted()).toBe(true);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ Render part way through but don't yet commit the updates so it is not\n \/\/ fully unmounted yet.\n expect(Scheduler).toFlushAndYieldThrough(['Other']);\n@@ -206,13 +198,9 @@ describe('ReactIncrementalReflection', () => {\n return [, ];\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ Flush past Component but don't complete rendering everything yet.\n expect(Scheduler).toFlushAndYieldThrough([\n ['componentWillMount', null],\n@@ -246,13 +234,9 @@ describe('ReactIncrementalReflection', () => {\n \n \/\/ The next step will render a new host node but won't get committed yet.\n \/\/ We expect this to mutate the original Fiber.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n ['componentWillUpdate', hostSpan],\n 'render',\n@@ -273,13 +257,9 @@ describe('ReactIncrementalReflection', () => {\n expect(ReactNoop.findInstance(classInstance)).toBe(hostDiv);\n \n \/\/ Render to null but don't commit it yet.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n ['componentWillUpdate', hostDiv],\n 'render',\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalScheduling-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalScheduling-test.js\nindex 3cc006dad1..cfb09e497e 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalScheduling-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalScheduling-test.js\n@@ -105,15 +105,10 @@ describe('ReactIncrementalScheduling', () => {\n \n \/\/ Schedule deferred work in the reverse order\n act(() => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.renderToRootWithID(, 'c');\n- ReactNoop.renderToRootWithID(, 'b');\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.renderToRootWithID(, 'c');\n ReactNoop.renderToRootWithID(, 'b');\n- }\n+ });\n \/\/ Ensure it starts in the order it was scheduled\n expect(Scheduler).toFlushAndYieldThrough(['c:2']);\n \n@@ -122,13 +117,9 @@ describe('ReactIncrementalScheduling', () => {\n expect(ReactNoop.getChildrenAsJSX('c')).toEqual('c:2');\n \/\/ Schedule last bit of work, it will get processed the last\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.renderToRootWithID(, 'a');\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.renderToRootWithID(, 'a');\n- }\n+ });\n \n \/\/ Keep performing work in the order it was scheduled\n expect(Scheduler).toFlushAndYieldThrough(['b:2']);\n@@ -181,13 +172,9 @@ describe('ReactIncrementalScheduling', () => {\n }\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ Render without committing\n expect(Scheduler).toFlushAndYieldThrough(['render: 0']);\n \n@@ -201,13 +188,9 @@ describe('ReactIncrementalScheduling', () => {\n 'componentDidUpdate: 1',\n ]);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- instance.setState({tick: 2});\n- });\n- } else {\n+ React.startTransition(() => {\n instance.setState({tick: 2});\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['render: 2']);\n expect(ReactNoop.flushNextYield()).toEqual([\n 'componentDidUpdate: 2',\n@@ -310,13 +293,9 @@ describe('ReactIncrementalScheduling', () => {\n return ;\n }\n }\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n \/\/ This should be just enough to complete all the work, but not enough to\n \/\/ commit it.\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalSideEffects-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalSideEffects-test.js\nindex 3e4cd2e4f5..fd1361de82 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalSideEffects-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalSideEffects-test.js\n@@ -456,13 +456,9 @@ describe('ReactIncrementalSideEffects', () => {\n <\/div>,\n );\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n \/\/ Flush some of the work without committing\n expect(Scheduler).toFlushAndYieldThrough(['Foo', 'Bar']);\n@@ -697,13 +693,9 @@ describe('ReactIncrementalSideEffects', () => {\n Scheduler.unstable_yieldValue('Foo');\n return ;\n }\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ This should be just enough to complete the tree without committing it\n expect(Scheduler).toFlushAndYieldThrough(['Foo']);\n expect(ReactNoop.getChildrenAsJSX()).toEqual(null);\n@@ -712,26 +704,18 @@ describe('ReactIncrementalSideEffects', () => {\n ReactNoop.flushNextYield();\n expect(ReactNoop.getChildrenAsJSX()).toEqual();\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ This should be just enough to complete the tree without committing it\n expect(Scheduler).toFlushAndYieldThrough(['Foo']);\n expect(ReactNoop.getChildrenAsJSX()).toEqual();\n \/\/ This time, before we commit the tree, we update the root component with\n \/\/ new props\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(ReactNoop.getChildrenAsJSX()).toEqual();\n \/\/ Now let's commit. We already had a commit that was pending, which will\n \/\/ render 2.\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalUpdates-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalUpdates-test.js\nindex 1d6ab92a49..de60712c11 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalUpdates-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactIncrementalUpdates-test.js\n@@ -152,21 +152,11 @@ describe('ReactIncrementalUpdates', () => {\n }\n \n \/\/ Schedule some async updates\n- if (\n- gate(\n- flags => flags.enableSyncDefaultUpdates || flags.enableUnifiedSyncLane,\n- )\n- ) {\n- React.startTransition(() => {\n- instance.setState(createUpdate('a'));\n- instance.setState(createUpdate('b'));\n- instance.setState(createUpdate('c'));\n- });\n- } else {\n+ React.startTransition(() => {\n instance.setState(createUpdate('a'));\n instance.setState(createUpdate('b'));\n instance.setState(createUpdate('c'));\n- }\n+ });\n \n \/\/ Begin the updates but don't flush them yet\n expect(Scheduler).toFlushAndYieldThrough(['a', 'b', 'c']);\n@@ -183,11 +173,7 @@ describe('ReactIncrementalUpdates', () => {\n });\n \n \/\/ The sync updates should have flushed, but not the async ones.\n- if (\n- gate(\n- flags => flags.enableSyncDefaultUpdates && flags.enableUnifiedSyncLane,\n- )\n- ) {\n+ if (gate(flags => flags.enableUnifiedSyncLane)) {\n expect(Scheduler).toHaveYielded(['d', 'e', 'f']);\n expect(ReactNoop).toMatchRenderedOutput();\n } else {\n@@ -199,11 +185,7 @@ describe('ReactIncrementalUpdates', () => {\n \/\/ Now flush the remaining work. Even though e and f were already processed,\n \/\/ they should be processed again, to ensure that the terminal state\n \/\/ is deterministic.\n- if (\n- gate(\n- flags => flags.enableSyncDefaultUpdates && !flags.enableUnifiedSyncLane,\n- )\n- ) {\n+ if (gate(flags => !flags.enableUnifiedSyncLane)) {\n expect(Scheduler).toFlushAndYield([\n \/\/ Since 'g' is in a transition, we'll process 'd' separately first.\n \/\/ That causes us to process 'd' with 'e' and 'f' rebased.\n@@ -257,21 +239,11 @@ describe('ReactIncrementalUpdates', () => {\n }\n \n \/\/ Schedule some async updates\n- if (\n- gate(\n- flags => flags.enableSyncDefaultUpdates || flags.enableUnifiedSyncLane,\n- )\n- ) {\n- React.startTransition(() => {\n- instance.setState(createUpdate('a'));\n- instance.setState(createUpdate('b'));\n- instance.setState(createUpdate('c'));\n- });\n- } else {\n+ React.startTransition(() => {\n instance.setState(createUpdate('a'));\n instance.setState(createUpdate('b'));\n instance.setState(createUpdate('c'));\n- }\n+ });\n \n \/\/ Begin the updates but don't flush them yet\n expect(Scheduler).toFlushAndYieldThrough(['a', 'b', 'c']);\n@@ -291,11 +263,7 @@ describe('ReactIncrementalUpdates', () => {\n });\n \n \/\/ The sync updates should have flushed, but not the async ones.\n- if (\n- gate(\n- flags => flags.enableSyncDefaultUpdates && flags.enableUnifiedSyncLane,\n- )\n- ) {\n+ if (gate(flags => flags.enableUnifiedSyncLane)) {\n expect(Scheduler).toHaveYielded(['d', 'e', 'f']);\n } else {\n \/\/ Update d was dropped and replaced by e.\n@@ -306,11 +274,7 @@ describe('ReactIncrementalUpdates', () => {\n \/\/ Now flush the remaining work. Even though e and f were already processed,\n \/\/ they should be processed again, to ensure that the terminal state\n \/\/ is deterministic.\n- if (\n- gate(\n- flags => flags.enableSyncDefaultUpdates && !flags.enableUnifiedSyncLane,\n- )\n- ) {\n+ if (gate(flags => !flags.enableUnifiedSyncLane)) {\n expect(Scheduler).toFlushAndYield([\n \/\/ Since 'g' is in a transition, we'll process 'd' separately first.\n \/\/ That causes us to process 'd' with 'e' and 'f' rebased.\n@@ -566,13 +530,9 @@ describe('ReactIncrementalUpdates', () => {\n }\n \n act(() => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n flushNextRenderIfExpired();\n expect(Scheduler).toHaveYielded([]);\n expect(Scheduler).toFlushAndYield([\n@@ -582,13 +542,9 @@ describe('ReactIncrementalUpdates', () => {\n ]);\n \n Scheduler.unstable_advanceTime(10000);\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- setCount(2);\n- });\n- } else {\n+ React.startTransition(() => {\n setCount(2);\n- }\n+ });\n flushNextRenderIfExpired();\n expect(Scheduler).toHaveYielded([]);\n });\n@@ -607,13 +563,9 @@ describe('ReactIncrementalUpdates', () => {\n \n Scheduler.unstable_advanceTime(10000);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n flushNextRenderIfExpired();\n expect(Scheduler).toHaveYielded([]);\n });\n@@ -624,26 +576,18 @@ describe('ReactIncrementalUpdates', () => {\n return text;\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n Scheduler.unstable_advanceTime(10000);\n flushNextRenderIfExpired();\n expect(Scheduler).toHaveYielded(['A']);\n \n Scheduler.unstable_advanceTime(10000);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n flushNextRenderIfExpired();\n expect(Scheduler).toHaveYielded([]);\n });\n@@ -680,13 +624,9 @@ describe('ReactIncrementalUpdates', () => {\n expect(root).toMatchRenderedOutput(null);\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- pushToLog('A');\n- });\n- } else {\n+ React.startTransition(() => {\n pushToLog('A');\n- }\n+ });\n \n ReactNoop.unstable_runWithPriority(ContinuousEventPriority, () =>\n pushToLog('B'),\n@@ -749,13 +689,9 @@ describe('ReactIncrementalUpdates', () => {\n expect(root).toMatchRenderedOutput(null);\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- pushToLog('A');\n- });\n- } else {\n+ React.startTransition(() => {\n pushToLog('A');\n- }\n+ });\n ReactNoop.unstable_runWithPriority(ContinuousEventPriority, () =>\n pushToLog('B'),\n );\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactInterleavedUpdates-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactInterleavedUpdates-test.js\nindex 153d4d28bd..89d9de5226 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactInterleavedUpdates-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactInterleavedUpdates-test.js\n@@ -57,78 +57,15 @@ describe('ReactInterleavedUpdates', () => {\n expect(root).toMatchRenderedOutput('000');\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- updateChildren(1);\n- });\n- } else {\n+ React.startTransition(() => {\n updateChildren(1);\n- }\n- \/\/ Partially render the children. Only the first one.\n- expect(Scheduler).toFlushAndYieldThrough([1]);\n-\n- \/\/ In an interleaved event, schedule an update on each of the children.\n- \/\/ Including the two that haven't rendered yet.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- updateChildren(2);\n- });\n- } else {\n- updateChildren(2);\n- }\n-\n- \/\/ We should continue rendering without including the interleaved updates.\n- expect(Scheduler).toFlushUntilNextPaint([1, 1]);\n- expect(root).toMatchRenderedOutput('111');\n- });\n- \/\/ The interleaved updates flush in a separate render.\n- expect(Scheduler).toHaveYielded([2, 2, 2]);\n- expect(root).toMatchRenderedOutput('222');\n- });\n-\n- \/\/ @gate !enableSyncDefaultUpdates\n- test('low priority update during an interleaved event is not processed during the current render', async () => {\n- \/\/ Same as previous test, but the interleaved update is lower priority than\n- \/\/ the in-progress render.\n- const updaters = [];\n-\n- function Child() {\n- const [state, setState] = useState(0);\n- useEffect(() => {\n- updaters.push(setState);\n- }, []);\n- return ;\n- }\n-\n- function updateChildren(value) {\n- for (let i = 0; i < updaters.length; i++) {\n- const setState = updaters[i];\n- setState(value);\n- }\n- }\n-\n- const root = ReactNoop.createRoot();\n-\n- await act(async () => {\n- root.render(\n- <>\n- \n- \n- \n- <\/>,\n- );\n- });\n- expect(Scheduler).toHaveYielded([0, 0, 0]);\n- expect(root).toMatchRenderedOutput('000');\n-\n- await act(async () => {\n- updateChildren(1);\n+ });\n \/\/ Partially render the children. Only the first one.\n expect(Scheduler).toFlushAndYieldThrough([1]);\n \n \/\/ In an interleaved event, schedule an update on each of the children.\n \/\/ Including the two that haven't rendered yet.\n- startTransition(() => {\n+ React.startTransition(() => {\n updateChildren(2);\n });\n \ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js b\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js\nindex 5f389b7f74..627bab2368 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js\n@@ -1560,13 +1560,9 @@ describe('ReactLazy', () => {\n expect(root).toMatchRenderedOutput('AB');\n \n \/\/ Swap the position of A and B\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.update();\n- });\n- } else {\n+ React.startTransition(() => {\n root.update();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Init B2', 'Loading...']);\n await lazyChildB2;\n \/\/ We need to flush to trigger the second one to load.\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactNewContext-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactNewContext-test.js\nindex 6f995d1643..bc9d428389 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactNewContext-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactNewContext-test.js\n@@ -881,13 +881,9 @@ describe('ReactNewContext', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \/\/ Render past the Provider, but don't commit yet\n expect(Scheduler).toFlushAndYieldThrough(['Foo']);\n \n@@ -927,13 +923,9 @@ describe('ReactNewContext', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Foo', 'Foo']);\n \n \/\/ Get a new copy of ReactNoop\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactSchedulerIntegration-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactSchedulerIntegration-test.js\nindex 70344ae700..8db1a121d8 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactSchedulerIntegration-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactSchedulerIntegration-test.js\n@@ -102,13 +102,9 @@ describe('ReactSchedulerIntegration', () => {\n scheduleCallback(NormalPriority, () => Scheduler.unstable_yieldValue('C'));\n \n \/\/ Schedule a React render. React will request a paint after committing it.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render('Update');\n- });\n- } else {\n+ React.startTransition(() => {\n root.render('Update');\n- }\n+ });\n \n \/\/ Advance time just to be sure the next tasks have lower priority\n Scheduler.unstable_advanceTime(2000);\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactSuspense-test.internal.js b\/packages\/react-reconciler\/src\/__tests__\/ReactSuspense-test.internal.js\nindex 05483e15c7..9c4ba7794b 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactSuspense-test.internal.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactSuspense-test.internal.js\n@@ -124,13 +124,9 @@ describe('ReactSuspense', () => {\n \n \/\/ Navigate the shell to now render the child content.\n \/\/ This should suspend.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.update();\n- });\n- } else {\n+ React.startTransition(() => {\n root.update();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYield([\n 'Foo',\n@@ -239,19 +235,7 @@ describe('ReactSuspense', () => {\n expect(root).toMatchRenderedOutput('Initial');\n \n \/\/ The update will suspend.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.update(\n- <>\n- }>\n- \n- <\/Suspense>\n- \n- \n- <\/>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n root.update(\n <>\n }>\n@@ -261,8 +245,7 @@ describe('ReactSuspense', () => {\n \n <\/>,\n );\n- }\n-\n+ });\n \/\/ Yield past the Suspense boundary but don't complete the last sibling.\n expect(Scheduler).toFlushAndYieldThrough([\n 'Suspend!',\n@@ -396,76 +379,6 @@ describe('ReactSuspense', () => {\n expect(root).toMatchRenderedOutput('AB');\n });\n \n- \/\/ @gate !enableSyncDefaultUpdates\n- it(\n- 'interrupts current render when something suspends with a ' +\n- \"delay and we've already skipped over a lower priority update in \" +\n- 'a parent',\n- () => {\n- function interrupt() {\n- \/\/ React has a heuristic to batch all updates that occur within the same\n- \/\/ event. This is a trick to circumvent that heuristic.\n- ReactTestRenderer.create('whatever');\n- }\n-\n- function App({shouldSuspend, step}) {\n- return (\n- <>\n- \n- }>\n- {shouldSuspend ? : null}\n- <\/Suspense>\n- \n- \n- <\/>\n- );\n- }\n-\n- const root = ReactTestRenderer.create(null, {\n- unstable_isConcurrent: true,\n- });\n-\n- root.update();\n- expect(Scheduler).toFlushAndYield(['A0', 'B0', 'C0']);\n- expect(root).toMatchRenderedOutput('A0B0C0');\n-\n- \/\/ This update will suspend.\n- root.update();\n-\n- \/\/ Do a bit of work\n- expect(Scheduler).toFlushAndYieldThrough(['A1']);\n-\n- \/\/ Schedule another update. This will have lower priority because it's\n- \/\/ a transition.\n- React.startTransition(() => {\n- root.update();\n- });\n-\n- \/\/ Interrupt to trigger a restart.\n- interrupt();\n-\n- expect(Scheduler).toFlushAndYieldThrough([\n- \/\/ Should have restarted the first update, because of the interruption\n- 'A1',\n- 'Suspend! [Async]',\n- 'Loading...',\n- 'B1',\n- ]);\n-\n- \/\/ Should not have committed loading state\n- expect(root).toMatchRenderedOutput('A0B0C0');\n-\n- \/\/ After suspending, should abort the first update and switch to the\n- \/\/ second update. So, C1 should not appear in the log.\n- \/\/ TODO: This should work even if React does not yield to the main\n- \/\/ thread. Should use same mechanism as selective hydration to interrupt\n- \/\/ the render before the end of the current slice of work.\n- expect(Scheduler).toFlushAndYield(['A2', 'B2', 'C2']);\n-\n- expect(root).toMatchRenderedOutput('A2B2C2');\n- },\n- );\n-\n it('mounts a lazy class component in non-concurrent mode', async () => {\n class Class extends React.Component {\n componentDidMount() {\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseList-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseList-test.js\nindex 8ff0f35c70..701d238549 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseList-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseList-test.js\n@@ -1362,13 +1362,9 @@ describe('ReactSuspenseList', () => {\n }\n \n \/\/ This render is only CPU bound. Nothing suspends.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['A']);\n \n@@ -1546,13 +1542,9 @@ describe('ReactSuspenseList', () => {\n }\n \n \/\/ This render is only CPU bound. Nothing suspends.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['A']);\n \n@@ -2548,15 +2540,9 @@ describe('ReactSuspenseList', () => {\n expect(ReactNoop).toMatchRenderedOutput(null);\n \n await act(async () => {\n- \/\/ Add a few items at the end.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- updateLowPri(true);\n- });\n- } else {\n+ React.startTransition(() => {\n updateLowPri(true);\n- }\n-\n+ });\n \/\/ Flush partially through.\n expect(Scheduler).toFlushAndYieldThrough(['B', 'C']);\n \n@@ -2692,14 +2678,9 @@ describe('ReactSuspenseList', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n-\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n 'App',\n 'First Pass A',\n@@ -2765,14 +2746,9 @@ describe('ReactSuspenseList', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n-\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n 'App',\n 'First Pass A',\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseWithNoopRenderer-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseWithNoopRenderer-test.js\nindex aad8729add..c73cd296b8 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseWithNoopRenderer-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactSuspenseWithNoopRenderer-test.js\n@@ -205,13 +205,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n );\n }\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n 'Foo',\n 'Bar',\n@@ -281,13 +277,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n expect(Scheduler).toFlushAndYield(['Foo']);\n \n \/\/ The update will suspend.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield([\n 'Foo',\n 'Bar',\n@@ -368,18 +360,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n ReactNoop.render(} \/>);\n expect(Scheduler).toFlushAndYield([]);\n \/\/ B suspends. Continue rendering the remaining siblings.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- }>\n- \n- \n- \n- \n- <\/Suspense>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n }>\n \n@@ -388,7 +369,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n \n <\/Suspense>,\n );\n- }\n+ });\n \/\/ B suspends. Continue rendering the remaining siblings.\n expect(Scheduler).toFlushAndYield([\n 'A',\n@@ -452,13 +433,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n expect(Scheduler).toFlushAndYield([]);\n expect(ReactNoop).toMatchRenderedOutput(null);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend! [Result]', 'Loading...']);\n expect(ReactNoop).toMatchRenderedOutput(null);\n \n@@ -603,26 +580,18 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n expect(Scheduler).toFlushAndYield([]);\n expect(ReactNoop).toMatchRenderedOutput(null);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'Loading...']);\n expect(ReactNoop).toMatchRenderedOutput(null);\n \n \/\/ Advance React's virtual time by enough to fall into a new async bucket,\n \/\/ but not enough to expire the suspense timeout.\n ReactNoop.expire(120);\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend! [A]', 'B', 'Loading...']);\n expect(ReactNoop).toMatchRenderedOutput(null);\n \n@@ -704,35 +673,23 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n \n \/\/ Schedule an update at several distinct expiration times\n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n Scheduler.unstable_advanceTime(1000);\n expect(Scheduler).toFlushAndYieldThrough(['Sibling']);\n interrupt();\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n Scheduler.unstable_advanceTime(1000);\n expect(Scheduler).toFlushAndYieldThrough(['Sibling']);\n interrupt();\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n Scheduler.unstable_advanceTime(1000);\n expect(Scheduler).toFlushAndYieldThrough(['Sibling']);\n interrupt();\n@@ -1049,18 +1006,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n );\n expect(Scheduler).toFlushAndYield([]);\n expect(root).toMatchRenderedOutput(null);\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render(\n- <>\n- }>\n- \n- \n- <\/Suspense>\n- <\/>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n root.render(\n <>\n }>\n@@ -1069,7 +1015,7 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n <\/Suspense>\n <\/>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Suspend! [Async]', 'Sibling']);\n \n await resolveText('Async');\n@@ -1135,21 +1081,13 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n ReactNoop.render(} \/>);\n expect(Scheduler).toFlushAndYield([]);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- }>\n- \n- <\/Suspense>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n }>\n \n <\/Suspense>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend! [Async]', 'Loading...']);\n expect(ReactNoop).toMatchRenderedOutput(null);\n \n@@ -1954,13 +1892,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n ReactNoop.render();\n expect(Scheduler).toFlushAndYield(['Foo']);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n Scheduler.unstable_advanceTime(100);\n await advanceTimers(100);\n \/\/ Start rendering\n@@ -1989,22 +1923,14 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n await advanceTimers(500);\n \/\/ No need to rerender.\n expect(Scheduler).toFlushWithoutYielding();\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- \/\/ Since this is a transition, we never fallback.\n- expect(ReactNoop).toMatchRenderedOutput(null);\n- } else {\n- expect(ReactNoop).toMatchRenderedOutput();\n- }\n+ \/\/ Since this is a transition, we never fallback.\n+ expect(ReactNoop).toMatchRenderedOutput(null);\n \n \/\/ Flush the promise completely\n await resolveText('A');\n \/\/ Renders successfully\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- \/\/ TODO: Why does this render Foo\n- expect(Scheduler).toFlushAndYield(['Foo', 'A']);\n- } else {\n- expect(Scheduler).toFlushAndYield(['A']);\n- }\n+ \/\/ TODO: Why does this render Foo\n+ expect(Scheduler).toFlushAndYield(['Foo', 'A']);\n expect(ReactNoop).toMatchRenderedOutput();\n });\n \n@@ -2138,13 +2064,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n ReactNoop.render();\n expect(Scheduler).toFlushAndYield(['Foo']);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Foo']);\n \n \/\/ Advance some time.\n@@ -2169,12 +2091,8 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n \/\/ updates as way earlier in the past. This test ensures that we don't\n \/\/ use this assumption to add a very long JND.\n expect(Scheduler).toFlushWithoutYielding();\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- \/\/ Transitions never fallback.\n- expect(ReactNoop).toMatchRenderedOutput(null);\n- } else {\n- expect(ReactNoop).toMatchRenderedOutput();\n- }\n+ \/\/ Transitions never fallback.\n+ expect(ReactNoop).toMatchRenderedOutput(null);\n });\n \n \/\/ TODO: flip to \"warns\" when this is implemented again.\n@@ -2542,13 +2460,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n expect(Scheduler).toFlushAndYield(['Foo', 'A']);\n expect(ReactNoop).toMatchRenderedOutput();\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYield([\n 'Foo',\n@@ -2563,17 +2477,8 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n Scheduler.unstable_advanceTime(600);\n await advanceTimers(600);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- \/\/ Transitions never fall back.\n- expect(ReactNoop).toMatchRenderedOutput();\n- } else {\n- expect(ReactNoop).toMatchRenderedOutput(\n- <>\n- \n- \n- <\/>,\n- );\n- }\n+ \/\/ Transitions never fall back.\n+ expect(ReactNoop).toMatchRenderedOutput();\n });\n \n \/\/ @gate enableLegacyCache\n@@ -2598,13 +2503,9 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n expect(Scheduler).toFlushAndYield(['Foo', 'A']);\n expect(ReactNoop).toMatchRenderedOutput();\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render();\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYield([\n 'Foo',\n@@ -2619,12 +2520,8 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n Scheduler.unstable_advanceTime(600);\n await advanceTimers(600);\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- \/\/ Transitions never fall back.\n- expect(ReactNoop).toMatchRenderedOutput();\n- } else {\n- expect(ReactNoop).toMatchRenderedOutput();\n- }\n+ \/\/ Transitions never fall back.\n+ expect(ReactNoop).toMatchRenderedOutput();\n });\n \n \/\/ @gate enableLegacyCache\n@@ -3160,26 +3057,18 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n await act(async () => {\n \/\/ Update. Since showing a fallback would hide content that's already\n \/\/ visible, it should suspend for a JND without committing.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend! [First update]']);\n \n \/\/ Should not display a fallback\n expect(root).toMatchRenderedOutput();\n \n \/\/ Update again. This should also suspend for a JND.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['Suspend! [Second update]']);\n \n \/\/ Should not display a fallback\n@@ -3951,117 +3840,6 @@ describe('ReactSuspenseWithNoopRenderer', () => {\n );\n });\n \n- \/\/ @gate enableLegacyCache\n- \/\/ @gate !enableSyncDefaultUpdates\n- it('regression: ping at high priority causes update to be dropped', async () => {\n- const {useState, useTransition} = React;\n-\n- let setTextA;\n- function A() {\n- const [textA, _setTextA] = useState('A');\n- setTextA = _setTextA;\n- return (\n- }>\n- \n- <\/Suspense>\n- );\n- }\n-\n- let setTextB;\n- let startTransition;\n- function B() {\n- const [textB, _setTextB] = useState('B');\n- \/\/ eslint-disable-next-line no-unused-vars\n- const [_, _startTransition] = useTransition();\n- startTransition = _startTransition;\n- setTextB = _setTextB;\n- return (\n- }>\n- \n- <\/Suspense>\n- );\n- }\n-\n- function App() {\n- return (\n- <>\n- \n- \n- <\/>\n- );\n- }\n-\n- const root = ReactNoop.createRoot();\n- await act(async () => {\n- await seedNextTextCache('A');\n- await seedNextTextCache('B');\n- root.render();\n- });\n- expect(Scheduler).toHaveYielded(['A', 'B']);\n- expect(root).toMatchRenderedOutput(\n- <>\n- \n- \n- <\/>,\n- );\n-\n- await act(async () => {\n- \/\/ Triggers suspense at normal pri\n- setTextA('A1');\n- \/\/ Triggers in an unrelated tree at a different pri\n- startTransition(() => {\n- \/\/ Update A again so that it doesn't suspend on A1. That way we can ping\n- \/\/ the A1 update without also pinging this one. This is a workaround\n- \/\/ because there's currently no way to render at a lower priority (B2)\n- \/\/ without including all updates at higher priority (A1).\n- setTextA('A2');\n- setTextB('B2');\n- });\n-\n- expect(Scheduler).toFlushAndYield([\n- 'B',\n- 'Suspend! [A1]',\n- 'Loading...',\n-\n- 'Suspend! [A2]',\n- 'Loading...',\n- 'Suspend! [B2]',\n- 'Loading...',\n- ]);\n- expect(root).toMatchRenderedOutput(\n- <>\n- \n- \n- <\/>,\n- );\n-\n- await resolveText('A1');\n- expect(Scheduler).toFlushAndYield([\n- 'A1',\n- 'Suspend! [A2]',\n- 'Loading...',\n- 'Suspend! [B2]',\n- 'Loading...',\n- ]);\n- expect(root).toMatchRenderedOutput(\n- <>\n- \n- \n- <\/>,\n- );\n-\n- await resolveText('A2');\n- await resolveText('B2');\n- });\n- expect(Scheduler).toHaveYielded(['A2', 'B2']);\n- expect(root).toMatchRenderedOutput(\n- <>\n- \n- \n- <\/>,\n- );\n- });\n-\n \/\/ Regression: https:\/\/github.com\/facebook\/react\/issues\/18486\n \/\/ @gate enableLegacyCache\n it('does not get stuck in pending state with render phase updates', async () => {\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/useMutableSource-test.internal.js b\/packages\/react-reconciler\/src\/__tests__\/useMutableSource-test.internal.js\nindex 27046562c9..2ce13bf613 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/useMutableSource-test.internal.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/useMutableSource-test.internal.js\n@@ -215,27 +215,7 @@ describe('useMutableSource', () => {\n const mutableSource = createMutableSource(source, param => param.version);\n \n act(() => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- <>\n- \n- \n- <\/>,\n- () => Scheduler.unstable_yieldValue('Sync effect'),\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n <>\n {\n <\/>,\n () => Scheduler.unstable_yieldValue('Sync effect'),\n );\n- }\n+ });\n \/\/ Do enough work to read from one component\n expect(Scheduler).toFlushAndYieldThrough(['a:one']);\n \n@@ -454,13 +434,9 @@ describe('useMutableSource', () => {\n \n \/\/ Changing values should schedule an update with React.\n \/\/ Start working on this update but don't finish it.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- source.value = 'two';\n- });\n- } else {\n+ React.startTransition(() => {\n source.value = 'two';\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['a:two']);\n \n \/\/ Re-renders that occur before the update is processed\n@@ -724,33 +700,7 @@ describe('useMutableSource', () => {\n \n \/\/ Because the store has not changed yet, there are no pending updates,\n \/\/ so it is considered safe to read from when we start this render.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- <>\n- \n- \n- \n- <\/>,\n- () => Scheduler.unstable_yieldValue('Sync effect'),\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n <>\n {\n <\/>,\n () => Scheduler.unstable_yieldValue('Sync effect'),\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['a:a:one', 'b:b:one']);\n \n \/\/ Mutating the source should trigger a tear detection on the next read,\n@@ -865,26 +815,7 @@ describe('useMutableSource', () => {\n \n act(() => {\n \/\/ Start a render that uses the mutable source.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- <>\n- \n- \n- <\/>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n <>\n {\n \/>\n <\/>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['a:one']);\n \n \/\/ Mutate source\n@@ -1535,17 +1466,7 @@ describe('useMutableSource', () => {\n expect(root).toMatchRenderedOutput('a0');\n \n await act(async () => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render(\n- <>\n- \n- \n- \n- <\/>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n root.render(\n <>\n \n@@ -1553,7 +1474,7 @@ describe('useMutableSource', () => {\n \n <\/>,\n );\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['a0', 'b0']);\n \/\/ Mutate in an event. This schedules a subscription update on a, which\n@@ -1689,13 +1610,9 @@ describe('useMutableSource', () => {\n \n await act(async () => {\n \/\/ Switch the parent and the child to read using the same config\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.render();\n- });\n- } else {\n+ React.startTransition(() => {\n root.render();\n- }\n+ });\n \/\/ Start rendering the parent, but yield before rendering the child\n expect(Scheduler).toFlushAndYieldThrough(['Parent: 2']);\n \n@@ -1706,41 +1623,19 @@ describe('useMutableSource', () => {\n source.valueB = '3';\n });\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- \/\/ In default sync mode, all of the updates flush sync.\n- expect(Scheduler).toFlushAndYieldThrough([\n- \/\/ The partial render completes\n- 'Child: 2',\n- 'Commit: 2, 2',\n- 'Parent: 3',\n- 'Child: 3',\n- ]);\n-\n- expect(Scheduler).toFlushAndYield([\n- \/\/ Now finish the rest of the update\n- 'Commit: 3, 3',\n- ]);\n- } else {\n- expect(Scheduler).toFlushAndYieldThrough([\n- \/\/ The partial render completes\n- 'Child: 2',\n- 'Commit: 2, 2',\n- ]);\n-\n- \/\/ Now there are two pending mutations at different priorities. But they\n- \/\/ both read the same version of the mutable source, so we must render\n- \/\/ them simultaneously.\n- \/\/\n- expect(Scheduler).toFlushAndYieldThrough([\n- 'Parent: 3',\n- \/\/ Demonstrates that we can yield here\n- ]);\n- expect(Scheduler).toFlushAndYield([\n- \/\/ Now finish the rest of the update\n- 'Child: 3',\n- 'Commit: 3, 3',\n- ]);\n- }\n+ \/\/ In default sync mode, all of the updates flush sync.\n+ expect(Scheduler).toFlushAndYieldThrough([\n+ \/\/ The partial render completes\n+ 'Child: 2',\n+ 'Commit: 2, 2',\n+ 'Parent: 3',\n+ 'Child: 3',\n+ ]);\n+\n+ expect(Scheduler).toFlushAndYield([\n+ \/\/ Now finish the rest of the update\n+ 'Commit: 3, 3',\n+ ]);\n });\n });\n \n@@ -1860,26 +1755,7 @@ describe('useMutableSource', () => {\n \n act(() => {\n \/\/ Start a render that uses the mutable source.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- <>\n- \n- \n- <\/>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n <>\n {\n \/>\n <\/>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['a:one']);\n \n const PrevScheduler = Scheduler;\n@@ -1941,26 +1817,7 @@ describe('useMutableSource', () => {\n \n act(() => {\n \/\/ Start a render that uses the mutable source.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactNoop.render(\n- <>\n- \n- \n- <\/>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactNoop.render(\n <>\n {\n \/>\n <\/>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['a:one']);\n \n const PrevScheduler = Scheduler;\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/useMutableSourceHydration-test.js b\/packages\/react-reconciler\/src\/__tests__\/useMutableSourceHydration-test.js\nindex ac709916ce..48e56959c0 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/useMutableSourceHydration-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/useMutableSourceHydration-test.js\n@@ -254,23 +254,14 @@ describe('useMutableSourceHydration', () => {\n \n expect(() => {\n act(() => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactDOMClient.hydrateRoot(container, , {\n- mutableSources: [mutableSource],\n- onRecoverableError(error) {\n- Scheduler.unstable_yieldValue('Log error: ' + error.message);\n- },\n- });\n- });\n- } else {\n+ React.startTransition(() => {\n ReactDOMClient.hydrateRoot(container, , {\n mutableSources: [mutableSource],\n onRecoverableError(error) {\n Scheduler.unstable_yieldValue('Log error: ' + error.message);\n },\n });\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['a:one']);\n source.value = 'two';\n });\n@@ -347,23 +338,14 @@ describe('useMutableSourceHydration', () => {\n \/>\n <\/>\n );\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactDOMClient.hydrateRoot(container, fragment, {\n- mutableSources: [mutableSource],\n- onRecoverableError(error) {\n- Scheduler.unstable_yieldValue('Log error: ' + error.message);\n- },\n- });\n- });\n- } else {\n+ React.startTransition(() => {\n ReactDOMClient.hydrateRoot(container, fragment, {\n mutableSources: [mutableSource],\n onRecoverableError(error) {\n Scheduler.unstable_yieldValue('Log error: ' + error.message);\n },\n });\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['0:a:one']);\n source.valueB = 'b:two';\n });\ndiff --git a\/packages\/react-test-renderer\/src\/__tests__\/ReactTestRendererAsync-test.js b\/packages\/react-test-renderer\/src\/__tests__\/ReactTestRendererAsync-test.js\nindex 03379563c7..de0fe83714 100644\n--- a\/packages\/react-test-renderer\/src\/__tests__\/ReactTestRendererAsync-test.js\n+++ b\/packages\/react-test-renderer\/src\/__tests__\/ReactTestRendererAsync-test.js\n@@ -89,17 +89,11 @@ describe('ReactTestRendererAsync', () => {\n }\n \n let renderer;\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- renderer = ReactTestRenderer.create(, {\n- unstable_isConcurrent: true,\n- });\n- });\n- } else {\n+ React.startTransition(() => {\n renderer = ReactTestRenderer.create(, {\n unstable_isConcurrent: true,\n });\n- }\n+ });\n \n \/\/ Flush the first two siblings\n expect(Scheduler).toFlushAndYieldThrough(['A:1', 'B:1']);\n@@ -135,17 +129,11 @@ describe('ReactTestRendererAsync', () => {\n }\n \n let renderer;\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- renderer = ReactTestRenderer.create(, {\n- unstable_isConcurrent: true,\n- });\n- });\n- } else {\n+ React.startTransition(() => {\n renderer = ReactTestRenderer.create(, {\n unstable_isConcurrent: true,\n });\n- }\n+ });\n \n \/\/ Flush the some of the changes, but don't commit\n expect(Scheduler).toFlushAndYieldThrough(['A:1']);\ndiff --git a\/packages\/react\/src\/__tests__\/ReactProfiler-test.internal.js b\/packages\/react\/src\/__tests__\/ReactProfiler-test.internal.js\nindex ba8f049a43..c9e124ec77 100644\n--- a\/packages\/react\/src\/__tests__\/ReactProfiler-test.internal.js\n+++ b\/packages\/react\/src\/__tests__\/ReactProfiler-test.internal.js\n@@ -196,19 +196,7 @@ describe(`onRender`, () => {\n return null;\n };\n \n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactTestRenderer.create(\n- \n- \n- \n- <\/React.Profiler>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactTestRenderer.create(\n \n \n@@ -218,7 +206,7 @@ describe(`onRender`, () => {\n unstable_isConcurrent: true,\n },\n );\n- }\n+ });\n \n \/\/ Times are logged until a render is committed.\n expect(Scheduler).toFlushAndYieldThrough(['first']);\n@@ -744,17 +732,7 @@ describe(`onRender`, () => {\n Scheduler.unstable_advanceTime(5); \/\/ 0 -> 5\n \n \/\/ Render partially, but run out of time before completing.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactTestRenderer.create(\n- \n- \n- \n- <\/React.Profiler>,\n- {unstable_isConcurrent: true},\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactTestRenderer.create(\n \n \n@@ -762,7 +740,7 @@ describe(`onRender`, () => {\n <\/React.Profiler>,\n {unstable_isConcurrent: true},\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Yield:2']);\n expect(callback).toHaveBeenCalledTimes(0);\n \n@@ -791,20 +769,7 @@ describe(`onRender`, () => {\n \n \/\/ Render partially, but don't finish.\n \/\/ This partial render should take 5ms of simulated time.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- ReactTestRenderer.create(\n- \n- \n- \n- \n- \n- <\/React.Profiler>\n- <\/React.Profiler>,\n- {unstable_isConcurrent: true},\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n ReactTestRenderer.create(\n \n \n@@ -815,7 +780,7 @@ describe(`onRender`, () => {\n <\/React.Profiler>,\n {unstable_isConcurrent: true},\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Yield:5']);\n expect(callback).toHaveBeenCalledTimes(0);\n \n@@ -857,17 +822,7 @@ describe(`onRender`, () => {\n \/\/ Render a partially update, but don't finish.\n \/\/ This partial render should take 10ms of simulated time.\n let renderer;\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- renderer = ReactTestRenderer.create(\n- \n- \n- \n- <\/React.Profiler>,\n- {unstable_isConcurrent: true},\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n renderer = ReactTestRenderer.create(\n \n \n@@ -875,7 +830,7 @@ describe(`onRender`, () => {\n <\/React.Profiler>,\n {unstable_isConcurrent: true},\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Yield:10']);\n expect(callback).toHaveBeenCalledTimes(0);\n \n@@ -944,17 +899,7 @@ describe(`onRender`, () => {\n \n \/\/ Render a partially update, but don't finish.\n \/\/ This partial render should take 3ms of simulated time.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- renderer.update(\n- \n- \n- \n- \n- <\/React.Profiler>,\n- );\n- });\n- } else {\n+ React.startTransition(() => {\n renderer.update(\n \n \n@@ -962,7 +907,7 @@ describe(`onRender`, () => {\n \n <\/React.Profiler>,\n );\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Yield:3']);\n expect(callback).toHaveBeenCalledTimes(0);\n \n@@ -1068,13 +1013,9 @@ describe(`onRender`, () => {\n \n \/\/ Render a partially update, but don't finish.\n \/\/ This partial render will take 10ms of actual render time.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- first.setState({renderTime: 10});\n- });\n- } else {\n+ React.startTransition(() => {\n first.setState({renderTime: 10});\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['FirstComponent:10']);\n expect(callback).toHaveBeenCalledTimes(0);\n \ndiff --git a\/packages\/react\/src\/__tests__\/ReactProfilerDevToolsIntegration-test.internal.js b\/packages\/react\/src\/__tests__\/ReactProfilerDevToolsIntegration-test.internal.js\nindex a0fef0cb23..faa0ade612 100644\n--- a\/packages\/react\/src\/__tests__\/ReactProfilerDevToolsIntegration-test.internal.js\n+++ b\/packages\/react\/src\/__tests__\/ReactProfilerDevToolsIntegration-test.internal.js\n@@ -155,13 +155,9 @@ describe('ReactProfiler DevTools integration', () => {\n \/\/ for updates.\n Scheduler.unstable_advanceTime(10000);\n \/\/ Schedule an update.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- root.update();\n- });\n- } else {\n+ React.startTransition(() => {\n root.update();\n- }\n+ });\n \n \/\/ Update B should not instantly expire.\n expect(Scheduler).toFlushAndYieldThrough([]);\ndiff --git a\/packages\/shared\/ReactFeatureFlags.js b\/packages\/shared\/ReactFeatureFlags.js\nindex e6f890e999..b3da065e13 100644\n--- a\/packages\/shared\/ReactFeatureFlags.js\n+++ b\/packages\/shared\/ReactFeatureFlags.js\n@@ -135,9 +135,6 @@ export const disableLegacyContext = false;\n \n export const enableUseRefAccessWarning = false;\n \n-\/\/ Enables time slicing for updates that aren't wrapped in startTransition.\n-export const enableSyncDefaultUpdates = true;\n-\n export const enableUnifiedSyncLane = __EXPERIMENTAL__;\n \n \/\/ Adds an opt-in to time slicing for updates that aren't wrapped in\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js b\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js\nindex dc8a42920b..7482b84e7c 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js\n@@ -67,7 +67,6 @@ export const createRootStrictEffectsByDefault = false;\n export const disableSchedulerTimeoutInWorkLoop = false;\n export const enableLazyContextPropagation = false;\n export const enableLegacyHidden = true;\n-export const enableSyncDefaultUpdates = true;\n export const enableUnifiedSyncLane = false;\n export const allowConcurrentByDefault = true;\n export const enableCustomElementPropertySupport = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js b\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js\nindex 77dca5a86d..29259deed6 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js\n@@ -58,7 +58,6 @@ export const enableUseRefAccessWarning = false;\n export const disableSchedulerTimeoutInWorkLoop = false;\n export const enableLazyContextPropagation = false;\n export const enableLegacyHidden = false;\n-export const enableSyncDefaultUpdates = true;\n export const enableUnifiedSyncLane = false;\n export const allowConcurrentByDefault = false;\n export const enableCustomElementPropertySupport = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js\nindex 4fec0051cb..2e0079d5ec 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js\n@@ -58,7 +58,6 @@ export const enableUseRefAccessWarning = false;\n export const disableSchedulerTimeoutInWorkLoop = false;\n export const enableLazyContextPropagation = false;\n export const enableLegacyHidden = false;\n-export const enableSyncDefaultUpdates = true;\n export const enableUnifiedSyncLane = __EXPERIMENTAL__;\n export const allowConcurrentByDefault = false;\n export const enableCustomElementPropertySupport = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.native.js b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.native.js\nindex 77aaf9e979..92f5a8ed4e 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.native.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.native.js\n@@ -57,7 +57,6 @@ export const enableUseRefAccessWarning = false;\n export const disableSchedulerTimeoutInWorkLoop = false;\n export const enableLazyContextPropagation = false;\n export const enableLegacyHidden = false;\n-export const enableSyncDefaultUpdates = true;\n export const enableUnifiedSyncLane = false;\n export const allowConcurrentByDefault = true;\n \ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js\nindex 6f639b86d6..c3ccf711f7 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js\n@@ -58,7 +58,6 @@ export const enableUseRefAccessWarning = false;\n export const disableSchedulerTimeoutInWorkLoop = false;\n export const enableLazyContextPropagation = false;\n export const enableLegacyHidden = false;\n-export const enableSyncDefaultUpdates = true;\n export const enableUnifiedSyncLane = false;\n export const allowConcurrentByDefault = true;\n export const enableCustomElementPropertySupport = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.testing.js b\/packages\/shared\/forks\/ReactFeatureFlags.testing.js\nindex fc6f6d8148..ee17c5053e 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.testing.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.testing.js\n@@ -58,7 +58,6 @@ export const enableUseRefAccessWarning = false;\n export const disableSchedulerTimeoutInWorkLoop = false;\n export const enableLazyContextPropagation = false;\n export const enableLegacyHidden = false;\n-export const enableSyncDefaultUpdates = true;\n export const enableUnifiedSyncLane = __EXPERIMENTAL__;\n export const allowConcurrentByDefault = false;\n export const enableCustomElementPropertySupport = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.testing.www.js b\/packages\/shared\/forks\/ReactFeatureFlags.testing.www.js\nindex 02aebb0b0e..9cbb2929c1 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.testing.www.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.testing.www.js\n@@ -58,7 +58,6 @@ export const enableUseRefAccessWarning = false;\n export const disableSchedulerTimeoutInWorkLoop = false;\n export const enableLazyContextPropagation = false;\n export const enableLegacyHidden = false;\n-export const enableSyncDefaultUpdates = true;\n export const enableUnifiedSyncLane = __EXPERIMENTAL__;\n export const allowConcurrentByDefault = true;\n export const enableCustomElementPropertySupport = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js b\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js\nindex 42e9c8a7ab..c754e18430 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js\n@@ -21,7 +21,6 @@ export const enableUseRefAccessWarning = __VARIANT__;\n export const enableProfilerNestedUpdateScheduledHook = __VARIANT__;\n export const disableSchedulerTimeoutInWorkLoop = __VARIANT__;\n export const enableLazyContextPropagation = __VARIANT__;\n-export const enableSyncDefaultUpdates = __VARIANT__;\n export const enableUnifiedSyncLane = __VARIANT__;\n export const enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay =\n __VARIANT__;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.www.js b\/packages\/shared\/forks\/ReactFeatureFlags.www.js\nindex edbc49557a..aa247e2c23 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.www.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.www.js\n@@ -28,7 +28,6 @@ export const {\n disableNativeComponentFrames,\n disableSchedulerTimeoutInWorkLoop,\n enableLazyContextPropagation,\n- enableSyncDefaultUpdates,\n enableUnifiedSyncLane,\n enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay,\n enableTransitionTracing,\ndiff --git a\/packages\/use-subscription\/src\/__tests__\/useSubscription-test.js b\/packages\/use-subscription\/src\/__tests__\/useSubscription-test.js\nindex ee89c3dbb9..aefef75ff9 100644\n--- a\/packages\/use-subscription\/src\/__tests__\/useSubscription-test.js\n+++ b\/packages\/use-subscription\/src\/__tests__\/useSubscription-test.js\n@@ -331,13 +331,9 @@ describe('useSubscription', () => {\n \n \/\/ Start React update, but don't finish\n act(() => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- renderer.update();\n- });\n- } else {\n+ React.startTransition(() => {\n renderer.update();\n- }\n+ });\n \n expect(Scheduler).toFlushAndYieldThrough(['Child: b-0']);\n expect(log).toEqual(['Parent.componentDidMount']);\n@@ -439,13 +435,9 @@ describe('useSubscription', () => {\n \n \/\/ Start React update, but don't finish\n act(() => {\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- renderer.update();\n- });\n- } else {\n+ React.startTransition(() => {\n renderer.update();\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough(['Child: b-0']);\n expect(log).toEqual([]);\n \n@@ -623,24 +615,16 @@ describe('useSubscription', () => {\n \/\/ Interrupt with a second mutation \"C\" -> \"D\".\n \/\/ This update will not be eagerly evaluated,\n \/\/ but useSubscription() should eagerly close over the updated value to avoid tearing.\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- mutate('C');\n- });\n- } else {\n+ React.startTransition(() => {\n mutate('C');\n- }\n+ });\n expect(Scheduler).toFlushAndYieldThrough([\n 'render:first:C',\n 'render:second:C',\n ]);\n- if (gate(flags => flags.enableSyncDefaultUpdates)) {\n- React.startTransition(() => {\n- mutate('D');\n- });\n- } else {\n+ React.startTransition(() => {\n mutate('D');\n- }\n+ });\n expect(Scheduler).toFlushAndYield(['render:first:D', 'render:second:D']);\n \n \/\/ No more pending updates\n","body":"This feature flag is enabled everywhere."}

dillon1000/react

Files changed