dillon1000/react

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Feature flag to disable legacy context for function components (#30319)

While the goal is to remove legacy context completely, I think we can
already land the removal of legacy context for function components. I
didn't even know this feature existed until reading the code recently.

The win is just a couple of property lookups on function renders, but it
trims down the API already as the full removal will likely still take a
bit more time.

www: Starting with enabled test renderer and a feature flag for
production rollout.

RN: Not enabled, will follow up on this.
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Jan Kassens authored af28f480e8e74ce71bb33259b61fef8a5a228f74 Parent d09484c
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M packages/react-dom/src/__tests__/ReactDOMServerIntegrationLegacyContext-test.js ModifiedM packages/react-dom/src/__tests__/ReactFunctionComponent-test.js ModifiedM packages/react-reconciler/src/ReactFiberBeginWork.js ModifiedM packages/react-reconciler/src/__tests__/ReactIncremental-test.js ModifiedM packages/react-reconciler/src/__tests__/ReactIncrementalErrorHandling-test.internal.js ModifiedM packages/react-reconciler/src/__tests__/ReactUse-test.js ModifiedM packages/react-server/src/ReactFizzServer.js ModifiedM packages/shared/ReactFeatureFlags.js ModifiedM packages/shared/forks/ReactFeatureFlags.native-fb.js ModifiedM packages/shared/forks/ReactFeatureFlags.native-oss.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.www.js ModifiedM packages/shared/forks/ReactFeatureFlags.www-dynamic.js ModifiedM packages/shared/forks/ReactFeatureFlags.www.js Modified
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