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eb259b5d3b
## Summary We currently do deep diffing for object props, and also use custom differs, if they are defined, for props with custom attribute config. The idea is to simply do a `===` comparison instead of all that work. We will do less computation on the JS side, but send more data to native. The hypothesis is that this change should be neutral in terms of performance. If that's the case, we'll be able to get rid of custom differs, and be one step closer to deleting view configs. This PR adds the `enableShallowPropDiffing` feature flag to support this experiment. ## How did you test this change? With `enableShallowPropDiffing` hardcoded to `true`: ``` yarn test packages/react-native-renderer ``` This fails on the following test cases: - should use the diff attribute - should do deep diffs of Objects by default - should skip deeply-nested changed functions Which makes sense with this change. These test cases should be deleted if the experiment is shipped.
118 lines
5.4 KiB
JavaScript
118 lines
5.4 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-oss';
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// TODO: Align these flags with canary and delete this file once RN ships from Canary.
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// -----------------------------------------------------------------------------
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// TODO for next React Native major.
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//
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// Alias __TODO_NEXT_RN_MAJOR__ to false for easier skimming.
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// -----------------------------------------------------------------------------
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const __TODO_NEXT_RN_MAJOR__ = false;
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export const enableRefAsProp = __TODO_NEXT_RN_MAJOR__;
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export const disableStringRefs = __TODO_NEXT_RN_MAJOR__;
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export const enableFastJSX = __TODO_NEXT_RN_MAJOR__;
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export const disableLegacyMode = __TODO_NEXT_RN_MAJOR__;
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export const useModernStrictMode = __TODO_NEXT_RN_MAJOR__;
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export const enableReactTestRendererWarning = __TODO_NEXT_RN_MAJOR__;
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export const enableAsyncActions = __TODO_NEXT_RN_MAJOR__;
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export const consoleManagedByDevToolsDuringStrictMode = __TODO_NEXT_RN_MAJOR__;
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export const enableDeferRootSchedulingToMicrotask = __TODO_NEXT_RN_MAJOR__;
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export const alwaysThrottleRetries = __TODO_NEXT_RN_MAJOR__;
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export const enableInfiniteRenderLoopDetection = __TODO_NEXT_RN_MAJOR__;
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export const enableComponentStackLocations = __TODO_NEXT_RN_MAJOR__;
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// -----------------------------------------------------------------------------
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// These are ready to flip after the next React npm release (or RN switches to
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// Canary, but can't flip before then because of react/renderer mismatches.
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// -----------------------------------------------------------------------------
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export const enableCache = __TODO_NEXT_RN_MAJOR__;
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export const enableRenderableContext = __TODO_NEXT_RN_MAJOR__;
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export const disableDefaultPropsExceptForClasses = __TODO_NEXT_RN_MAJOR__;
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// -----------------------------------------------------------------------------
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// Already enabled for next React Native major.
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// Hardcode these to true after the next RN major.
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//
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// Alias __NEXT_RN_MAJOR__ to true for easier skimming.
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// -----------------------------------------------------------------------------
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const __NEXT_RN_MAJOR__ = true;
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export const disableClientCache = __NEXT_RN_MAJOR__;
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export const disableLegacyContext = __NEXT_RN_MAJOR__;
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export const enableTaint = __NEXT_RN_MAJOR__;
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export const enableUnifiedSyncLane = __NEXT_RN_MAJOR__;
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export const enableFizzExternalRuntime = __NEXT_RN_MAJOR__; // DOM-only
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export const enableBinaryFlight = true;
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export const enableFlightReadableStream = true;
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export const enableServerComponentLogs = __NEXT_RN_MAJOR__;
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// DEV-only but enabled in the next RN Major.
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// Not supported by flag script to avoid the special case.
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export const debugRenderPhaseSideEffectsForStrictMode = __DEV__;
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// TODO: decide on React 19
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export const enableUseMemoCacheHook = true;
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export const enableNoCloningMemoCache = false;
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export const enableUseDeferredValueInitialArg = __EXPERIMENTAL__;
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// -----------------------------------------------------------------------------
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// All other flags
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// -----------------------------------------------------------------------------
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export const enableCPUSuspense = false;
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export const enableDebugTracing = false;
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export const enableAsyncDebugInfo = false;
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export const enableSchedulingProfiler = __PROFILE__;
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export const enableLegacyCache = false;
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export const enablePostpone = 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 enableScopeAPI = false;
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export const enableCreateEventHandleAPI = false;
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export const enableSuspenseCallback = false;
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export const enableTrustedTypesIntegration = false;
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export const disableTextareaChildren = false;
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export const enableSuspenseAvoidThisFallback = false;
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export const enableSuspenseAvoidThisFallbackFizz = false;
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export const enableUseEffectEventHook = false;
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export const favorSafetyOverHydrationPerf = true;
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export const enableLegacyFBSupport = false;
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export const enableFilterEmptyStringAttributesDOM = true;
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export const enableGetInspectorDataForInstanceInProduction = false;
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export const enableRetryLaneExpiration = false;
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export const retryLaneExpirationMs = 5000;
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export const syncLaneExpirationMs = 250;
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export const transitionLaneExpirationMs = 5000;
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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 forceConcurrentByDefaultForTesting = false;
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export const allowConcurrentByDefault = false;
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export const enableTransitionTracing = false;
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export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
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export const passChildrenWhenCloningPersistedNodes = false;
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export const enableAsyncIterableChildren = false;
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export const enableAddPropertiesFastPath = false;
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export const enableShallowPropDiffing = false;
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export const renameElementSymbol = true;
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export const enableOwnerStacks = __EXPERIMENTAL__;
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// Profiling Only
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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 enableUpdaterTracking = __PROFILE__;
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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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