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The improvements added to React 19 require some breaking changes, but we've worked to make the upgrade as smooth as possible, and we don't expect the changes to impact most apps.
If you'd like to help us test React 19, follow the steps in this upgrade guide and [report any issues](https://github.com/facebook/react/issues/new?assignees=&labels=React+19&projects=&template=19.md&title=%5BReact+19%5D) you encounter. For a list of new features added to React 19, see the [React 19 release post](/blog/2024/12/05/react-19).
### Improvements to Suspense {/*improvements-to-suspense*/}
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### サスペンスに関する改善 {/*improvements-to-suspense*/}
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In React 19, when a component suspends, React will immediately commit the fallback of the nearest Suspense boundary without waiting for the entire sibling tree to render. After the fallback commits, React schedules another render for the suspended siblings to "pre-warm" lazy requests in the rest of the tree:
<Diagramname="prerender"height={162}width={1270}alt="Diagram showing a tree of three components, one parent labeled Accordion and two children labeled Panel. Both Panel components contain isActive with value false.">
<Diagramname="prewarm"height={162}width={1270}alt="The same diagram as the previous, with the isActive of the first child Panel component highlighted indicating a click with the isActive value set to true. The second Panel component still contains value false.">
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React Conf 2024 では、[React 19 RC](/blog/2024/04/25/react-19)、[React Native New Architecture Beta](https://github.com/reactwg/react-native-new-architecture/discussions/189)、および [React Compiler](/learn/react-compiler) の実験的リリースを発表しました。コミュニティもステージに立ち、[React Router v7](https://remix.run/blog/merging-remix-and-react-router)、Expo Router の [Universal Server Components](https://www.youtube.com/watch?v=T8TZQ6k4SLE&t=20765s)、[RedwoodJS](https://redwoodjs.com/blog/rsc-now-in-redwoodjs) での React Server Components など、多くの発表を行いました。
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At React Conf 2024, we announced the [React 19 RC](/blog/2024/12/05/react-19), the [React Native New Architecture Beta](https://github.com/reactwg/react-native-new-architecture/discussions/189), and an experimental release of the [React Compiler](/learn/react-compiler). The community also took the stage to announce [React Router v7](https://remix.run/blog/merging-remix-and-react-router), [Universal Server Components](https://www.youtube.com/watch?v=T8TZQ6k4SLE&t=20765s) in Expo Router, React Server Components in [RedwoodJS](https://redwoodjs.com/blog/rsc-now-in-redwoodjs), and much more.
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React Conf 2024 では、[React 19 RC](/blog/2024/12/05/react-19)、[React Native New Architecture Beta](https://github.com/reactwg/react-native-new-architecture/discussions/189)、および [React Compiler](/learn/react-compiler) の実験的リリースを発表しました。コミュニティもステージに立ち、[React Router v7](https://remix.run/blog/merging-remix-and-react-router)、Expo Router の [Universal Server Components](https://www.youtube.com/watch?v=T8TZQ6k4SLE&t=20765s)、[RedwoodJS](https://redwoodjs.com/blog/rsc-now-in-redwoodjs) での React Server Components など、多くの発表を行いました。
-[RedwoodJS, now with React Server Components](https://www.youtube.com/watch?v=T8TZQ6k4SLE&t=26815s) by [Amy Dutton](https://twitter.com/selfteachme)
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-[Introducing Universal React Server Components in Expo Router](https://www.youtube.com/watch?v=T8TZQ6k4SLE&t=20765s) by [Evan Bacon](https://twitter.com/Baconbrix)
Next in the keynote, [Josh Story](https://twitter.com/joshcstory) and [Andrew Clark](https://twitter.com/acdlite) shared new features coming in React 19, and announced the React 19 RC which is ready for testing in production. Check out all the features in the [React 19 release post](/blog/2024/12/05/react-19), and see these talks for deep dives on the new features:
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