React 19 has been fully released on December 5, 2024. The new update introduces new features aiming to improve both developer experience and application performance:
- Actions will simplify state updates by allowing asynchronous functions to handle pending states, errors, and optimistic updates automatically.
- Server Components now enable rendering components on the server, reducing client-side JavaScript bundle sizes and improving load times.
- The update introduced New Hooks like `use` which allows reading resources during render, suspending until promises resolve, `useFormStatus` to provide access to the status of parent <form> elements, and `useOptimistic` for assisting in rendering optimistic UI updates while asynchronous requests are in progress.
- React Compiler transforms React code into optimized JavaScript, potentially improving performance by reducing unnecessary re-renders. This feature is still in beta.
The long-awaited update includes some improvements as well:
- React DOM Static APIs like prerender and prerenderToNodeStream to react-dom/static are now available. They boost static site generation by waiting for data to load before returning static HTML streams.
- The Enhanced Server-Side Rendering (SSR) affects rendering efficiency on the server, leading to faster page loads and better SEO.
To learn more, read full release notes.
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