19.3.0 (September 9, 2026)

Summary

Below is a list of all new features, APIs, and bug fixes. Read the React 19.3 release post for more information. New React Features <ViewTransition /> : Adds <ViewTransition /> and addTransitionType APIs to power View Transition animations in React ( @sebmarkbage , @jackpope , @gaearon : #31975 , #31987 , #31996 , #31999 , #32001 , #32002 , #32028 , #32029 , #32031 , #32034 , #32038 , #32041 , #32050 , #32090 , #32105 , #32254 , #32379 , #32422 , #32462 , #32540 , #32545 , #32585 , #32599 , #32611 , #32612 , #32617 , #32651 , #32653 , #32656 , #32664 , #32699 , #32723 , #32734 , #32751 , #32752 , #32760 , #32761 , #32764 , #32772 , #32790 , #32819 , #32820 , #32822 , #32833 , #32849 , #33094 , #33191 , #33200 , #33206 , #33293 , #33330 , #33331 , #33332 , #33357 , #33362 , #33433 , #33576 , #34374 , #34450 , #34481 , #34500 , #34502 , #34510 , #34511 , #34539 , #35567 , #35564 , #35485 , #35380 , #35063 , #35060 , #34676 , #36917 , #35337 , #35520 ) Fragment Refs: Add Refs to <Fragment /> to support composable platform behavior ( @jackpope , @sebmarkbage , @eps1lon , @Dhakshin2007 , @chirokas , @teamleaderleo , @fallintoplace : #32465 , #32613 , #32619 , #32654 , #32660 , #32682 , #32722 , #32813 , #32814 , #33056 , #33058 , #33093 , #34069 , #34103 , #34544 , #34545 , #37062 , #37061 , #37060 , #36047 , #36010 , #35642 , #35641 , #35637 , #35630 , #34935 , #37457 , #37408 , #37326 , #37251 , #37171 , #37169 , #37168 , #37167 , #37166 , #37165 , #37164 , #37163 , #37162 , #37161 , #37160 , #37125 , #37063 ) New React DOM Features browser() : a new react-dom API that returns a usable which errors during server rendering and resolves in the browser. use(browser()) inside a <Suspense> boundary marks a subtree as browser-only without reporting a recoverable error ( @gnoff : #37143 , #37241 ) Added an onBrowserBailout option to the react-dom/server APIs to observe when a subtree defers to the browser ( @gnoff #37193 ) Notable changes Enable Trusted Types API integration ( @rickhanlonii #35816 ) Transitions now render independently instead of being entangled into a single render, so a slow transition no longer holds up unrelated ones ( @acdlite #37290 ) Added a DEV-only warning when a component appears to have been unblocked by calling use() conditionally ( @hoxyq , @eps1lon : #37104 , #37203 , #37491 ) All Changes React Fast Refresh Fixes Fix Fast Refresh to find and remount edits to components wrapped behind lazy() ( @sophiebits #36965 ) Fix Fast Refresh so edits to a memo() comparison function take effect ( @sophiebits #36964 ) Fix Fast Refresh crash when an edit changes the kind of a component's type ( @sophiebits #36963 ) Unify hot reload type resolution for Fast Refresh ( @sophiebits #36962 ) Fix Fast Refresh to remount correctly when an edit changes the component kind ( @sophiebits #36950 ) Double invoke effects in StrictMode after Fast Refresh ( @eps1lon #35962 ) Performance Track Fixes Prevent crash when accessing $$typeof in Performance Tracks ( @eps1lon #35679 ) Handle non-string function names in Performance Tracks ( @eps1lon #35659 ) Use minus ( - ) instead of en dash for removed props in Performance Tracks ( @eps1lon #35649 ) Handle arrays with bigints in deep objects in Performance Tracks ( @eps1lon #35648 ) Don't enumerate typed array props in Performance Tracks in DEV ( @UditDewan #36913 ) Bail out of diffing wide objects and arrays in Performance Tracks ( @eps1lon #34742 ) Clear potentially large performance measures in DEV ( @hoxyq #34803 ) Fix missing else branch for renders with no props change in Performance Tracks ( @hoxyq #34837 ) Activity Fixes Fix useSyncExternalStore missing store mutations that happened while an Activity tree was hidden ( @sophiebits #36947 ) Hide portal contents when an Activity is hidden ( @acdlite #35091 ) Prevent metadata hoisting in hidden <Activity> trees ( @ronnakamoto #34983 ) Prevent errors thrown inside a hidden Activity from escaping to the visible UI ( @acdlite #35074 ) Don't unhide a node if a direct parent Offscreen is still hidden ( @sebmarkbage #34821 ) Don't show internal <Offscreen> component in error messages ( @rickhanlonii #35763 ) Warn in DEV when a component appears to have been unblocked by a conditional use() ( @hoxyq , @eps1lon : #37104 , #37203 , #37491 ) Render transitions independently instead of entangling them into a single render ( @acdlite #37290 ) Fix hang when updating a dehydrated boundary inside a hidden tree ( @gaearon #37135 ) Don't reacquire Host Singletons during dev effect validation ( @gnoff #37113 ) Only remove properties from Host Singletons on release ( @gnoff #37112 ) Don't invoke effects on moved children in StrictMode ( @sophiebits #36948 ) Throw a clearer error when a rejected Promise is incorrectly instrumented ( @eps1lon #36328 ) Fix context propagation into Suspense fallbacks ( @acdlite #36160 ) Fix context propagation through suspended Suspense boundaries ( @acdlite #35839 ) Fix useDeferredValue getting stuck ( @gaearon #36134 ) Update useActionState error message to say "action state" instead of "form state" ( @rickhanlonii #35790 ) Don't warn when rendering data block scripts ( @eps1lon #35953 ) Treat fibers with alternates as mounted in getNearestMountedFiber ( @sebmarkbage #35578 ) Always instrument the lazy initializer thenable ( @gnoff #35521 ) Annotate cascading updates for DevTools performance tracks in DEV ( @huntie #34961 ) Resolve the .default export of a React.lazy as the canonical value ( @sebmarkbage #34906 ) Limit owner stacks to 10 frames ( @eps1lon #34864 ) Ensure useEffectEvent reads latest values in forwardRef and memo() components ( @eps1lon #34831 ) React DOM Copy source onto the synthetic toggle event ( @lazerg #37389 ) Update HTML parser rules for the new <select> parser ( @josepharhar #34804 ) Update defaultValue for type="number" inputs to match other input types ( @sophiebits #36980 ) Avoid setting innerHTML when it hasn't changed ( @sophiebits #36949 ) Forward the nonce option in ReactDOM.preloadModule() ( @UditDewan #36851 ) Support fetchPriority for module resources ( @TheAlexLichter #36835 ) Track stylesheet preloads when explicitly preloaded to avoid unnecessary suspension ( @gnoff #36386 ) Suggest correct casing for the misspelled credentialless iframe attribute ( @vmx906 #36322 ) Add credentialless as a recognized boolean attribute for iframes ( @vmx906 #36148 ) Prevent reentrant finishedTask from calling completeAll multiple times ( @gnoff #36287 ) Update the CSS shorthand property list ( @kidonng #35636 ) Support the maskType SVG prop ( @sleitor #35921 ) Add support for onFullscreenChange and onFullscreenError events ( @chirokas #34621 ) Include submitter in submit events ( @eps1lon #35590 ) Fire onReset when automatically resetting forms ( @eps1lon #35176 ) Use the FormData submitter parameter ( @jenseng #29028 ) Fix form status reset when component state is updated ( @eps1lon #34075 ) Batch updates from resize events until the next frame ( @eps1lon #35117 ) React Server Add nonce to rendered import maps ( @mattcosta7 #37339 ) Add an onBrowserBailout option to observe subtrees that defer to the browser ( @gnoff #37193 ) Stop the caller's signal from retaining a finished render ( @unstubbable #37315 ) Construct the render lifetime controller only when it is needed ( @unstubbable #37357 ) Fix react-dom/server hanging on Deno ( @fraidev #35235 ) Extend stack overflow recovery to retries in SSR ( @jackpope #36977 ) Fix false-positive hydration mismatch on nonce attributes ( @MaxwellCohen #37030 ) Guard shell-error callbacks instead of nulling them out on the request ( @eps1lon #36916 ) Stop firing onAllReady after the shell errored ( @eps1lon #36903 ) Treat an incomplete tree as an error during error recovery ( @acdlite #36911 ) Fix non-script modulepreload tracking ( @fallintoplace #36564 ) Finalize postponed nextSegmentId after the prelude flush ( @gaojude #36779 ) Preserve referrerPolicy in image preload headers ( @ulises-jeremias #36803 ) Allow pending work to specialize abort reasons ( @gnoff #36586 ) Abort tasks that suspend after aborting during render ( @gnoff #36585 ) Finish abort in a scheduled task ( @gnoff #36580 ) Fix aborts during resumed rendering ( @gnoff #36584 ) Track abort state on the request ( @gnoff #36583 ) Model external work scheduling explicitly in the fb bundle ( @gnoff #36576 ) Continue reporting aborted task errors after a fatal abort ( @gnoff #36575 ) Disallow abort reentrancy ( @gnoff #36574 ) Stop transpiling computed property names ( @eps1lon #36542 ) Fix crash when capturing the callsite of a stalled use() of a rejected Flight chunk ( @lubieowoce #36544 ) Double invoke effects in Strict Mode during hydration ( @eps1lon #35961 ) Add additional task reentrancy protections in Fizz ( @gnoff #36291 ) Don't outline Suspense boundaries with suspensey CSS during shell flush ( @gnoff #35824 ) Push a stalled use() to the owner stack and debug task ( @eps1lon #35226 ) Fix useId tracking on replay ( @gnoff #35518 ) Correctly handle replaying when hydrating ( @gnoff #35494 ) Simplify the createSuspenseBoundary path ( @sebmarkbage #35087 ) Unify preamble-only fields to save a field on Suspense boundaries ( @sebmarkbage #35068 ) Unify prerender-only fields to save a field on Suspense boundaries ( @sebmarkbage #35067 ) Push halted awaits to the owner stack for late-arriving I/O info ( @unstubbable #35019 ) Include all Node.js APIs in the Bun entrypoint for react-dom/server ( @RiskyMH #34193 ) Detach a Suspense boundary after flushing its segment ( @gnoff #34694 ) React Server Components Keep an element pending while a referenced row is resolving ( @unstubbable #37542 ) Fix RangeError from exponential debug info growth ( @unstubbable #37481 ) Abort the cache signal when debug objects are retained ( @unstubbable #37342 ) Transfer key validation of lazy nodes when they are unwrapped ( @unstubbable #37258 ) Add pending_weak to the Flight thenable protocol ( @acdlite #37154 ) Outline and dedupe repeated strings ( @gaearon #37147 ) Port Reply Server traversal guards to the Flight Client ( @eps1lon #37144 ) Define Flight chunk .then with Object.defineProperty ( @eps1lon #37109 ) Support Turbopack's experimental array format for chunks ( @sampoder #37095 ) Limit fake JSX call site stacks to 10 frames ( @timneutkens #37086 ) Improve performance when decoding Flight replies ( @gnoff #37090 ) Recognize Node 22+ V8 frames for Promise statics in debug info ( @gaearon #36969 ) Tailor the warning for binary data serialized through toJSON (Node Buffer ) ( @unstubbable #36873 ) Resolve models before JSON.stringify for faster serialization ( @mhart #36795 ) Prune debug info when chunks error ( @gnoff #36782 ) Avoid main-thread stalls from large debug strings ( @unstubbable #36570 ) Fix stranded row content under Node stream backpressure ( @unstubbable #36516 ) Fix dropped FormData entries in decodeReplyFromBusboy ( @unstubbable #36468 ) Harden types and improve performance of Flight replies ( @eps1lon #36425 ) Add more cycle protections to Flight replies ( @eps1lon #36236 ) Transport AggregateError.errors ( @eps1lon #36156 ) Bail out early when a backing entry for Blob deserialization is not a Blob ( @eps1lon #36055 ) Clear chunk reason after successful module initialization ( @unstubbable #36024 ) Add support for transporting Error.cause ( @eps1lon #35810 ) Walk parsed JSON instead of using a reviver for faster RSC payload parsing ( @timneutkens #35776 ) Skip transferReferencedDebugInfo during debug info resolution ( @unstubbable #35795 ) Add unstable_allowPartialStream option to Flight Client ( @unstubbable #35731 ) Fix encodeReply for JSX with temporary references ( @unstubbable #35730 ) Fix debug channel flag in Node.js renderToPipeableStream ( @feedthejim #35724 ) Fix stack overflow in visitAsyncNode with deep async chains ( @unstubbable #35612 ) Allow Server Components to render context providers from client modules ( @rickhanlonii #35675 ) Allow overriding request.timeOrigin via options.startTime ( @lubieowoce #35598 ) Warn once if eval is disabled in the dev environment ( @eps1lon #35661 ) Restore original function name in dev server callstacks served with unsafe-eval ( @eps1lon #35650 ) Fix react-markup types for server references ( @eps1lon #35634 ) Add more DoS mitigations to Flight replies and harden Flight ( @unstubbable #35632 ) Allow cyclic references to be serialized when unwrapping lazy elements ( @unstubbable #35471 ) Improve cyclic thenable detection in Flight reply server ( @cvan20191 #35369 ) Add extra loop protection to Flight reply server ( @sebmarkbage #35351 ) Patch Promise cycles and toString on Server Functions ( @sebmarkbage #35345 ) Move react-server-dom-webpack/*.unbundled to private react-server-dom-unbundled ( @eps1lon #35290 ) Never parse then functions in Flight replies ( @sebmarkbage #35289 ) Patch Flight reply server with fixes from Flight Client ( @sebmarkbage #35277 ) Complete the list of Node.js internal Promise awaits ( @eps1lon #35161 ) Reduce risk of maximum call stack exceeded when emitting async sequences ( @eps1lon #35159 ) Fix pending chunks count for streams and async iterables in DEV ( @unstubbable #35143 ) Fix broken byte stream parsing caused by buffer detachment ( @unstubbable #35127 ) Fix hasReadable flag in Node.js clients' debug channel ( @unstubbable #35039 ) Fix debug info filtering to include later resolved I/O ( @unstubbable #35036 ) Cache the value when visiting the same I/O or Promise along different paths ( @sebmarkbage #35005 ) Clone subsequent I/O nodes when resolved more than once ( @sebmarkbage #35003 ) Fix hang after resolving cyclic references ( @unstubbable #34988 ) Allow passing DEV-only startTime as an option ( @sebmarkbage #34912 ) Ignore bound-anonymous-fn resources as they're not considered I/O ( @sebmarkbage #34911 ) Fix detached ArrayBuffer error when streaming typed arrays ( @unstubbable #34849 ) Exclude RSC stream if the stream resolves in a task ( @sebmarkbage #34838 ) Forward the current environment when forwarding I/O entries ( @sebmarkbage #34836 ) Look for moved debug info when logging component performance track ( @sebmarkbage #34839 ) Respect displayName of Promise instances on the server ( @sebmarkbage #34825 ) Avoid unnecessary indirection when serializing debug info ( @unstubbable #34797 ) Fix preload as attribute for stylesheets ( @unstubbable #34760 ) Don't serialize toJSON in debug path and omit wide arrays ( @sebmarkbage #34759 ) Add support for <Activity> ( @eps1lon #34697 )

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