Sourced from react's releases.

19.3.1 (October 14th, 2026)

React Server Components

• Improve transport protocol (#37845 by @​unstubbable and @​eps1lon)

19.3.0 (September 9, 2026)

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)

... (truncated)

Sourced from react's changelog.

19.3.0 (September 9, 2026)

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)

... (truncated)

• 61aa00d [19.3.x][Flight] Improve transport protocol (#37845)
• 2dc7da7 [test] Bump Jest to 30.4 (#37382)
• 4f93894 docs: remove stale parentType param from validateChildKeys JSDoc (#36928)
• dbc3750 Update required references to GitHub repo (#36752)
• 900ae09 [flow] Bump flow to v0.317.0 (#36701)
• fbb1370 [flow] Bump flow to v0.307.1 (#36199)
• 56922cf [react-native-renderer] Delete Paper (legacy) renderer (#36285)
• 74568e8 [Flight] Transport AggregateErrors.errors (#36156)
• e66ef64 [tests] remove withoutStack from assertConsole helpers (#35498)
• db71391 [Fiber] Instrument the lazy initializer thenable in all cases (#35521)
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