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Mac test ie119/8/2023 ![]() For more information, see the Library Upgrade Guide for. This solves an issue that already exists in React 17 and below, but is even more important in React 18 because React yields to the browser during concurrent rendering, giving it a chance to recalculate layout. This hook will run after the DOM is mutated, but before layout effects read the new layout. Unless you’ve already built a CSS-in-JS library we don’t expect you to ever use this. useInsertionEffect is a new hook that allows CSS-in-JS libraries to address performance issues of injecting styles in render.For more information, see the useSyncExternalStore overview post and useSyncExternalStore API details. This new API is recommended for any library that integrates with state external to React. useSyncExternalStore is a new hook that allows external stores to support concurrent reads by forcing updates to the store to be synchronous.To support React 18, some libraries may need to switch to one of the following APIs: In the React 18 Working Group we worked with library maintainers to create new APIs needed to support concurrent rendering for use cases specific to their use case in areas like styles, and external stores. ![]() Before import įor more information, see the Automatic batching deep dive. ![]()
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