mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Andrew Clark
be67db46b6
Adds a second argument to useDeferredValue called initialValue: ```js const value = useDeferredValue(finalValue, initialValue); ``` During the initial render of a component, useDeferredValue will return initialValue. Once that render finishes, it will spawn an additional render to switch to finalValue. This same sequence should occur whenever the hook is hidden and revealed again, i.e. by a Suspense or Activity, though this part is not yet implemented. When initialValue is not provided, useDeferredValue has no effect during initial render, but during an update, it will remain on the previous value, then spawn an additional render to switch to the new value. (This is the same behavior that exists today.) During SSR, initialValue is always used, if provided. This feature is currently behind an experimental flag. We plan to ship it in a non-breaking release.
96 lines
3.9 KiB
JavaScript
96 lines
3.9 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
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import typeof * as ExportsType from './ReactFeatureFlags.native-fb';
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// NOTE: There are no flags, currently. Uncomment the stuff below if we add one.
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// Re-export dynamic flags from the internal module. Intentionally using *
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// because this import is compiled to a `require` call.
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import * as dynamicFlags from 'ReactNativeInternalFeatureFlags';
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// We destructure each value before re-exporting to avoid a dynamic look-up on
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// the exports object every time a flag is read.
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export const {
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enableUseRefAccessWarning,
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enableDeferRootSchedulingToMicrotask,
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alwaysThrottleRetries,
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useMicrotasksForSchedulingInFabric,
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passChildrenWhenCloningPersistedNodes,
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} = dynamicFlags;
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// The rest of the flags are static for better dead code elimination.
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export const enableDebugTracing = false;
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export const enableSchedulingProfiler = __PROFILE__;
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export const enableProfilerTimer = __PROFILE__;
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export const enableProfilerCommitHooks = __PROFILE__;
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export const enableProfilerNestedUpdatePhase = __PROFILE__;
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export const enableProfilerNestedUpdateScheduledHook = false;
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export const enableUpdaterTracking = __PROFILE__;
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export const enableCache = false;
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export const enableLegacyCache = false;
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export const enableCacheElement = true;
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export const enableFetchInstrumentation = false;
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export const enableFormActions = true; // Doesn't affect Native
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export const enableBinaryFlight = true;
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export const enableTaint = true;
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export const enablePostpone = false;
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export const enableSchedulerDebugging = false;
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export const debugRenderPhaseSideEffectsForStrictMode = true;
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export const disableJavaScriptURLs = false;
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export const disableCommentsAsDOMContainers = true;
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export const disableInputAttributeSyncing = false;
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export const disableIEWorkarounds = true;
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export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
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export const enableScopeAPI = false;
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export const enableCreateEventHandleAPI = false;
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export const enableSuspenseCallback = false;
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export const disableLegacyContext = false;
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export const enableTrustedTypesIntegration = false;
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export const disableTextareaChildren = false;
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export const disableModulePatternComponents = false;
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export const enableSuspenseAvoidThisFallback = false;
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export const enableSuspenseAvoidThisFallbackFizz = false;
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export const enableCPUSuspense = true;
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export const enableUseMemoCacheHook = true;
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export const enableUseEffectEventHook = false;
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export const enableClientRenderFallbackOnTextMismatch = true;
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export const enableComponentStackLocations = false;
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export const enableLegacyFBSupport = false;
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export const enableFilterEmptyStringAttributesDOM = false;
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export const enableGetInspectorDataForInstanceInProduction = true;
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export const createRootStrictEffectsByDefault = false;
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export const disableSchedulerTimeoutInWorkLoop = false;
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export const enableLazyContextPropagation = false;
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export const enableLegacyHidden = true;
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export const forceConcurrentByDefaultForTesting = false;
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export const enableUnifiedSyncLane = false;
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export const allowConcurrentByDefault = true;
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export const enableCustomElementPropertySupport = false;
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export const consoleManagedByDevToolsDuringStrictMode = false;
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export const enableServerContext = true;
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export const enableTransitionTracing = false;
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export const enableFloat = true;
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export const enableHostSingletons = true;
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export const useModernStrictMode = false;
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export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
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export const enableFizzExternalRuntime = false;
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export const enableAsyncActions = false;
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export const enableUseDeferredValueInitialArg = true;
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// Flow magic to verify the exports of this file match the original version.
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((((null: any): ExportsType): FeatureFlagsType): ExportsType);
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