mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Andrew Clark
258b375a41
In the lazy context implementation, not all context changes are propagated from the provider, so we can't rely on the propagation alone to mark the consumer as dirty. The consumer needs to compare to the previous value, like we do for state and context. I added a `memoizedValue` field to the context dependency type. Then in the consumer, we iterate over the current dependencies to see if something changed. We only do this iteration after props and state has already bailed out, so it's a relatively uncommon path, except at the root of a changed subtree. Alternatively, we could move these comparisons into `readContext`, but that's a much hotter path, so I think this is an appropriate trade off.
70 lines
3.0 KiB
JavaScript
70 lines
3.0 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its 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.testing.www';
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export const debugRenderPhaseSideEffectsForStrictMode = false;
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export const enableDebugTracing = false;
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export const enableSchedulingProfiler = false;
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export const warnAboutDeprecatedLifecycles = true;
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export const replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
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export const enableProfilerTimer = false;
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export const enableProfilerCommitHooks = false;
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export const enableProfilerNestedUpdatePhase = false;
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export const enableProfilerNestedUpdateScheduledHook = false;
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export const enableSchedulerTracing = false;
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export const enableSuspenseServerRenderer = true;
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export const enableSelectiveHydration = true;
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export const enableLazyElements = false;
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export const enableCache = false;
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export const disableJavaScriptURLs = true;
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export const disableInputAttributeSyncing = false;
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export const enableSchedulerDebugging = false;
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export const enableScopeAPI = true;
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export const enableCreateEventHandleAPI = true;
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export const warnAboutUnmockedScheduler = true;
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export const enableSuspenseCallback = true;
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export const warnAboutDefaultPropsOnFunctionComponents = false;
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export const warnAboutStringRefs = false;
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export const disableLegacyContext = __EXPERIMENTAL__;
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export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
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export const enableTrustedTypesIntegration = false;
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export const disableTextareaChildren = __EXPERIMENTAL__;
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export const disableModulePatternComponents = true;
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export const warnUnstableRenderSubtreeIntoContainer = false;
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export const warnAboutSpreadingKeyToJSX = false;
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export const enableComponentStackLocations = true;
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export const enableLegacyFBSupport = !__EXPERIMENTAL__;
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export const enableFilterEmptyStringAttributesDOM = false;
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export const disableNativeComponentFrames = false;
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export const skipUnmountedBoundaries = true;
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export const enableNewReconciler = false;
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export const deferRenderPhaseUpdateToNextBatch = true;
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export const decoupleUpdatePriorityFromScheduler = false;
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export const enableDiscreteEventFlushingChange = true;
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export const enableStrictEffects = false;
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export const createRootStrictEffectsByDefault = false;
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export const enableUseRefAccessWarning = false;
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export const enableRecursiveCommitTraversal = false;
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export const disableSchedulerTimeoutInWorkLoop = false;
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export const enableDiscreteEventMicroTasks = false;
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export const enableSyncMicroTasks = false;
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export const enableNativeEventPriorityInference = false;
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export const enableLazyContextPropagation = false;
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// Flow magic to verify the exports of this file match the original version.
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// eslint-disable-next-line no-unused-vars
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type Check<_X, Y: _X, X: Y = _X> = null;
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// eslint-disable-next-line no-unused-expressions
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(null: Check<ExportsType, FeatureFlagsType>);
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