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ca41adb8c1
This removes the concept of `prepareUpdate()`, behind a flag. React Native already does everything in the commit phase, but generates a temporary update payload before applying it. React Fabric does it both in the render phase. Now it just moves it to a single host config. For DOM I forked updateProperties into one that does diffing and updating in one pass vs just applying a pre-diffed updatePayload. There are a few downsides of this approach: - If only "children" has changed, we end up scheduling an update to be done in the commit phase. Since we traverse through it anyway, it's probably not much extra. - It does more work in the commit phase so for a large tree that is mostly unchanged, it'll stall longer. - It does some extra work for special cases since that work happens if anything has changed. We no longer have a deep bailout. - The special cases now have to each replicate the "clean up old props" loop, leading to extra code. The benefit is that this doesn't allocate temporary extra objects (possibly multiple per element if the array has to resize). It's less work overall. It also gives us an option to reuse this function for a sync render optimization. Another benefit is that if we do the loop in the commit phase I can do further optimizations by reading all props that I need for special cases in that loop instead of polymorphic reads from props. This is what I'd like to do in future refactors that would be stacked on top of this change.
76 lines
3.0 KiB
JavaScript
76 lines
3.0 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.test-renderer';
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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 replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
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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 = false;
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export const enableCache = true;
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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 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 enableSchedulerDebugging = false;
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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 revertRemovalOfSiblingPrerendering = 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 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 = false;
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export const enableSuspenseAvoidThisFallback = false;
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export const enableSuspenseAvoidThisFallbackFizz = false;
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export const enableCPUSuspense = false;
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export const enableUseHook = true;
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export const enableUseMemoCacheHook = false;
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export const enableUseEffectEventHook = false;
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export const enableClientRenderFallbackOnTextMismatch = true;
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export const createRootStrictEffectsByDefault = false;
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export const enableUseRefAccessWarning = false;
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export const disableSchedulerTimeoutInWorkLoop = false;
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export const enableLazyContextPropagation = false;
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export const enableLegacyHidden = false;
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export const enableSyncDefaultUpdates = true;
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export const enableUnifiedSyncLane = false;
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export const allowConcurrentByDefault = true;
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export const consoleManagedByDevToolsDuringStrictMode = false;
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export const enableServerContext = true;
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export const enableUseMutableSource = false;
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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 enableDeferRootSchedulingToMicrotask = true;
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export const diffInCommitPhase = 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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