Everything You Need to Know About React 19
summary
React 19 is in RC and introduces concrete changes: form Actions are async functions (can run inside startTransition) so forms submit via an action attribute and pending/data come from useFormStatus and useActionState removing manual loading flags, a demo converts a React 18 form to work without onChange handlers, a separate React Compiler plugin auto-memoizes code (replacing many useMemo/useCallback cases), refs become a prop, per-component metadata and stylesheet precedence are supported.
AI-written summary · about
chapters (9)
- 0:00Introduction
- 4:56React 19 features
- 10:52Compiler auto-memoization
- 17:33New hooks in React 19
- 21:48React 19 changes
- 23:54Live demo: React 18 to 19
- 29:34Recap of React 19
- 30:30Speaker encouragement
- 31:55Q&A
