![]() ![]() It is primarily useful for component libraries integrating with accessibility APIs that require unique IDs. useId is a new hook for generating unique IDs on both the client and server, while avoiding hydration mismatches.Read React 18 release post and React 18 upgrade guide for more information. ( in #24289)īelow is a list of all new features, APIs, deprecations, and breaking changes. Replace the implementation with the use-sync-external-store shim.Don't consider a known dependency stable when the variable is reassigned.Fix false positive errors with a large number of branches.Significantly improve performance of renderToPipeableStream.Fix escaping for the bootstrapScriptContent contents.Ensure the reason for hydration errors is always displayed.Warn when calling setState in useInsertionEffect.Fix a missing warning about a setState loop in useEffect.Fix an inconsistency in whether the props object is the same between renders.Fix throttling of revealing Suspense fallbacks.Fix useDeferredValue causing an infinite loop when passed an unmemoized value.Fix some transition updates being ignored.Fix componentWillUnmount firing twice inside of Suspense.Fix suppressHydrationWarning to work in production too.Fix the false positive warning about react-dom/client when using UMD bundle.Add support for useId() inside Server Components.Fix buffering in some worker environments by explicitly setting highWaterMark to 0.Disallow complex children inside elements to match the browser constraints.Eliminate extraneous text separators in the HTML where possible.Allow to provide a reason when aborting the HTML stream.Pass information about server errors to the client.Fix ignored setState in Safari when adding an iframe.Fix false positive hydration errors with Suspense. ![]() Fix hydrating into document causing a blank page on mismatch.Provide a component stack as a second argument to onRecoverableError. ![]()
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