docs: update startTransition async guidance for React 19#8496
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docs: update startTransition async guidance for React 19#8496LuxologyGG wants to merge 1 commit into
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Clarify that useTransition supports async Actions in React 19, including state updates after await. Reserve the post-await wrapping requirement for standalone startTransition. Rephrase troubleshooting to avoid implying async callbacks are disallowed. Fixes reactjs#7172
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Summary
Closes #7172
The
startTransitiondocs still described async Actions as a limitation that required wrapping state updates afterawaitin anotherstartTransitioncall. In React 19,useTransitionsupports async Actions, and updates afterawaitare included in the Transition automatically.This PR updates the
startTransitionanduseTransitionreference pages to document async Action support, clarifies that the post-awaitwrapping requirement only applies to the standalonestartTransitionfunction, and updates a relateduseActionStatecaveat that pointed to the old guidance.Before / After
Before: Both standalone
startTransitionanduseTransitionwere documented as requiring a secondstartTransitioncall afterawait.After:
useTransition'sstartTransitionin React 19 includes post-awaitupdates automatically; standalonestartTransitionstill requires explicit wrapping afterawait.Test plan
/reference/react/startTransitionand/reference/react/useTransition