dillon1000/react

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Add suspenseCallback feature for runtime tracing of loading states (#16134)

This adds a 'SuspenseCallback' feature flag. When the property is set on
a suspense component it will be called during the commit phase with a
set of the immediate thenable for this component. This will allow user
code to build runtime tracing of the cause for a suspense boundary.
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Benoit Girard authored 42b75ab007a5e7c159933cfdbf2b6845d89fc7f2 Parent c73e1f2
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M packages/react-reconciler/src/ReactFiberCommitWork.js ModifiedM packages/react-reconciler/src/ReactFiberCompleteWork.js ModifiedA packages/react-reconciler/src/__tests__/ReactSuspenseCallback-test.internal.js AddedM 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.persistent.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.www.js ModifiedM packages/shared/forks/ReactFeatureFlags.www.js Modified
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