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https://github.com/facebook/react.git
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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.
31 lines
1.3 KiB
JavaScript
31 lines
1.3 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 strict
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*/
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// In xplat, these flags are controlled by GKs. Because most GKs have some
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// population running in either mode, we should run our tests that way, too,
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//
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// Use __VARIANT__ to simulate a GK. The tests will be run twice: once
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// with the __VARIANT__ set to `true`, and once set to `false`.
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//
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// TODO: __VARIANT__ isn't supported for React Native flags yet. You can set the
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// flag here but it won't be set to `true` in any of our test runs. Need to
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// add a test configuration for React Native.
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export const alwaysThrottleRetries = __VARIANT__;
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export const consoleManagedByDevToolsDuringStrictMode = __VARIANT__;
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export const enableAsyncActions = __VARIANT__;
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export const enableComponentStackLocations = __VARIANT__;
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export const enableDeferRootSchedulingToMicrotask = __VARIANT__;
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export const enableInfiniteRenderLoopDetection = __VARIANT__;
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export const enableRenderableContext = __VARIANT__;
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export const enableUnifiedSyncLane = __VARIANT__;
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export const passChildrenWhenCloningPersistedNodes = __VARIANT__;
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export const useModernStrictMode = __VARIANT__;
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export const disableDefaultPropsExceptForClasses = __VARIANT__;
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