mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Andrew ClarkandGitHub
48b4ecc901
This removes defaultProps support for all component types except for
classes. We've chosen to continue supporting defaultProps for classes
because lots of older code relies on it, and unlike function components,
(which can use default params), there's no straightforward alternative.
By implication, it also removes support for setting defaultProps on
`React.lazy` wrapper. So this will not work:
```js
const MyClassComponent = React.lazy(() => import('./MyClassComponent'));
// MyClassComponent is not actually a class; it's a lazy wrapper. So
// defaultProps does not work.
MyClassComponent.defaultProps = { foo: 'bar' };
```
However, if you set the default props on the class itself, then it's
fine.
For classes, this change also moves where defaultProps are resolved.
Previously, defaultProps were resolved by the JSX runtime. This change
is only observable if you introspect a JSX element, which is relatively
rare but does happen.
In other words, previously `<ClassWithDefaultProp />.props.aDefaultProp`
would resolve to the default prop value, but now it does not.
102 lines
4.0 KiB
JavaScript
102 lines
4.0 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.native-fb';
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import typeof * as DynamicExportsType from './ReactFeatureFlags.native-fb-dynamic';
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// Re-export dynamic flags from the internal module.
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// Intentionally using * because this import is compiled to a `require` call.
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import * as dynamicFlagsUntyped from 'ReactNativeInternalFeatureFlags';
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const dynamicFlags: DynamicExportsType = (dynamicFlagsUntyped: any);
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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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alwaysThrottleRetries,
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consoleManagedByDevToolsDuringStrictMode,
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enableAsyncActions,
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enableComponentStackLocations,
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enableDeferRootSchedulingToMicrotask,
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enableInfiniteRenderLoopDetection,
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enableRenderableContext,
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enableUnifiedSyncLane,
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passChildrenWhenCloningPersistedNodes,
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useModernStrictMode,
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disableDefaultPropsExceptForClasses,
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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 enableAsyncDebugInfo = 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 enableUpdaterTracking = __PROFILE__;
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export const enableCache = true;
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export const enableLegacyCache = false;
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export const enableFetchInstrumentation = false;
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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 debugRenderPhaseSideEffectsForStrictMode = __DEV__;
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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 disableLegacyContext = 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 enableCPUSuspense = true;
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export const enableUseMemoCacheHook = true;
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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 = true;
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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 enableFizzExternalRuntime = true;
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export const enableUseDeferredValueInitialArg = true;
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export const disableClientCache = true;
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export const enableServerComponentKeys = true;
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export const enableServerComponentLogs = true;
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// TODO: Roll out with GK. Don't keep as dynamic flag for too long, though,
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// because JSX is an extremely hot path.
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export const enableRefAsProp = false;
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export const disableStringRefs = false;
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export const enableReactTestRendererWarning = false;
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export const disableLegacyMode = false;
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export const disableDOMTestUtils = false;
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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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