React Actions and JSX Improvements
summary
React 19 adds action prop accepts functions that run client- or server-side, integrate with streaming SSR, selective hydration, Suspense and transitions, and support progressive enhancement so client actions queue before hydration and server actions trigger normal navigations. Built-in hooks like useOptimistic, useFormStatus and useActionState simplify optimistic UI and error handling. JSX runtime now treats ref as a prop, removing forwardRef and deprecating string refs and legacy context; beta becomes RC with a stable release expected in weeks.
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chapters (7)
- 0:00Introduction to React 19
- 0:25What are React Actions
- 5:39How React Actions work
- 8:31Advanced UX with Actions
- 9:35JSX improvements in React 19
- 10:38Refs as regular props
- 12:05React 19 features and RC release
