Everything You Need to Know About React 19
summary
React 19 hits release candidate and focuses on making forms first-class: Form Actions are async functions you plug into a <form> so you no longer manually set loading state; the demo converts a React 18 form to a React 19 form using useActionState to get {state, formAction} and useFormStatus to read pending and submitted fields. A separate react compiler plugin auto-memoizes components/hooks (skips child renders, avoids useMemo/useCallback), refs become plain props, and metadata and stylesheet precedence are added. Installation via npm is shown.
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chapters (8)
- 0:00Introduction and speaker intro
- 3:42Why React 19 matters
- 9:16React compiler and optimizations
- 13:58New hooks in React 19
- 17:30New API and other changes
- 20:46Demo: Upgrading to React 19
- 26:15Summary of React 19 changes
- 27:14Closing and speaker advice
