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Update react monorepo to v19 (major) #1375
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This PR contains the following updates:
18.3.1->19.2.018.3.1->19.2.0Release Notes
facebook/react (react)
v19.2.0Compare Source
Below is a list of all new features, APIs, and bug fixes.
Read the React 19.2 release post for more information.
New React Features
<Activity>: A new API to hide and restore the UI and internal state of its children.useEffectEventis a React Hook that lets you extract non-reactive logic into an Effect Event.cacheSignal(for RSCs) lets your know when thecache()lifetime is over.New React DOM Features
resume: to resume a prerender to a stream.resumeAndPrerender: to resume a prerender to HTML.resumeToPipeableStream: to resume a prerender to a stream.resumeAndPrerenderToNodeStream: to resume a prerender to HTML.prerenderAPIs to return apostponedstate that can be passed to theresumeAPIs.Notable changes
<ViewTransition>Component. React will batch as much reveals as possible before the first paint while trying to hit popular first-contentful paint metrics.prerender,renderToReadableStream) to server-side-rendering APIs for Node.js:IDs generated by useIdAll Changes
React
<Activity />was developed over many years, starting beforeClassComponent.setState(@acdlite @sebmarkbage and many others)%oplaceholder (@eps1lon #34198)useDeferredValueloop in popstate event (@acdlite #32821)useDeferredValue(@acdlite #34376)cacheSignal(@sebmarkbage #33557)React DOM
:for IDs generated byuseId(@sebmarkbage, @eps1lon: #32001, #33342#33099, #33422)nonceto be used on hoistable styles (@Andarist #32461)React.useinsideReact.lazy-ed Component (@hi-ogawa #33941)progressiveChunkSizeoption for server-side-rendering APIs (@sebmarkbage #33027)React Server Components
<img>and<link>using hints before they're rendered (@sebmarkbage #34604)filterStackFrame(@eps1lon #33707)React Reconciler
on*handlers to account for upcoming experimental APIsv19.1.1Compare Source
React
v19.1.0Compare Source
Owner Stack
An Owner Stack is a string representing the components that are directly responsible for rendering a particular component. You can log Owner Stacks when debugging or use Owner Stacks to enhance error overlays or other development tools. Owner Stacks are only available in development builds. Component Stacks in production are unchanged.
#32538, #32529, #32538
React
useIdto use valid CSS selectors, changing format from:r123:to«r123». #32001React DOM
hrefattribute is an empty string #31783getHoistableRoot()didn’t work properly when the container was a Document #32321<!-- -->) as a DOM container. #32250<script>and<template>tags to be nested within<select>tags. #31837use-sync-external-store
exportsfield topackage.jsonforuse-sync-external-storeto support various entrypoints. #25231React Server Components
unstable_prerender, a new experimental API for prerendering React Server Components on the server #31724registerServerReferencein client builds to handle server references in different environments. #32534v19.0.0Compare Source
Below is a list of all new features, APIs, deprecations, and breaking changes. Read React 19 release post and React 19 upgrade guide for more information.
New Features
React
startTransitioncan now accept async functions. Functions passed tostartTransitionare called “Actions”. A given Transition can include one or more Actions which update state in the background and update the UI with one commit. In addition to updating state, Actions can now perform side effects including async requests, and the Action will wait for the work to finish before finishing the Transition. This feature allows Transitions to include side effects likefetch()in the pending state, and provides support for error handling, and optimistic updates.useActionState: is a new hook to order Actions inside of a Transition with access to the state of the action, and the pending state. It accepts a reducer that can call Actions, and the initial state used for first render. It also accepts an optional string that is used if the action is passed to a formactionprop to support progressive enhancement in forms.useOptimistic: is a new hook to update state while a Transition is in progress. It returns the state, and a set function that can be called inside a transition to “optimistically” update the state to expected final value immediately while the Transition completes in the background. When the transition finishes, the state is updated to the new value.use: is a new API that allows reading resources in render. In React 19,useaccepts a promise or Context. If provided a promise,usewill suspend until a value is resolved.usecan only be used in render but can be called conditionally.refas a prop: Refs can now be used as props, removing the need forforwardRef.React DOM Client
<form> actionprop: Form Actions allow you to manage forms automatically and integrate withuseFormStatus. When a<form> actionsucceeds, React will automatically reset the form for uncontrolled components. The form can be reset manually with the newrequestFormResetAPI.<button> and <input> formActionprop: Actions can be passed to theformActionprop to configure form submission behavior. This allows using different Actions depending on the input.useFormStatus: is a new hook that provides the status of the parent<form> action, as if the form was a Context provider. The hook returns the values:pending,data,method, andaction.<head>section of the document.<head>on the client before revealing the content of a Suspense boundary that depends on that stylesheet.preinit,preload,prefetchDNS, andpreconnectAPIs to optimize initial page loads by moving discovery of additional resources like fonts out of stylesheet loading. They can also be used to prefetch resources used by an anticipated navigation.React DOM Server
prerenderandprerenderToNodeStreamAPIs for static site generation. They are designed to work with streaming environments like Node.js Streams and Web Streams. UnlikerenderToString, they wait for data to load for HTML generation.React Server Components
Deprecations
element.refaccess: React 19 supports ref as a prop, so we’re deprecatingelement.refin favor ofelement.props.ref. Accessing will result in a warning.react-test-renderer: In React 19, react-test-renderer logs a deprecation warning and has switched to concurrent rendering for web usage. We recommend migrating your tests to @testing-library/react or @testing-library/react-nativeBreaking Changes
React 19 brings in a number of breaking changes, including the removals of long-deprecated APIs. We recommend first upgrading to
18.3.1, where we've added additional deprecation warnings. Check out the upgrade guide for more details and guidance on codemodding.React
onUncaughtErrorandonCaughtErrormethods tocreateRootandhydrateRootto customize this error handling.propTypes: UsingpropTypeswill now be silently ignored. If required, we recommend migrating to TypeScript or another type-checking solution.defaultPropsfor functions: ES6 default parameters can be used in place. Class components continue to supportdefaultPropssince there is no ES6 alternative.contextTypesandgetChildContext: Legacy Context for class components has been removed in favor of thecontextTypeAPI.React.createFactory: Now that JSX is broadly supported, allcreateFactoryusage can be migrated to JSX components.react-test-renderer/shallow: This has been a re-export of react-shallow-renderer since React 18. If needed, you can continue to use the third-party package directly. We recommend using @testing-library/react or @testing-library/react-native instead.React DOM
react-dom/test-utils: We’ve movedactfromreact-dom/test-utilsto react. All other utilities have been removed.ReactDOM.render,ReactDOM.hydrate: These have been removed in favor of the concurrent equivalents:ReactDOM.createRootandReactDOM.hydrateRoot.unmountComponentAtNode: Removed in favor ofroot.unmount().ReactDOM.findDOMNode: You can replaceReactDOM.findDOMNodewith DOM Refs.Notable Changes
React
<Context>as a provider: You can now render<Context>as a provider instead of<Context.Provider>.useDeferredValueinitial value argument: When provided,useDeferredValuewill return the initial value for the initial render of a component, then schedule a re-render in the background with thedeferredValuereturned.useMemoanduseCallbackwill now reuse the memoized results from the first render, during the second render. Additionally, StrictMode will now double-invoke ref callback functions on initial mount.React DOM
TypeScript Changes
The most common changes can be codemodded with
npx types-react-codemod@latest preset-19 ./path-to-your-react-ts-files.ReactChild(replacement:React.ReactElement | number | string)ReactFragment(replacement:Iterable<React.ReactNode>)ReactNodeArray(replacement:ReadonlyArray<React.ReactNode>)ReactText(replacement:number | string)VoidFunctionComponent(replacement:FunctionComponent)VFC(replacement:FC)prop-types:Requireable,ValidationMap,Validator,WeakValidationMapcreate-react-class:ClassicComponentClass,ClassicComponent,ClassicElement,ComponentSpec,Mixin,ReactChildren,ReactHTML,ReactSVG,SFCFactoryuseRef: The initial argument is now required to matchuseState,createContextetcuseRef()are now always mutable instead of sometimes being immutable. This feature was too confusing for users and conflicted with legit cases where refs were managed by React and manually written to.ReactElementtyping: The props of React elements now default tounknowninstead ofanyif the element is typed asReactElementJSXnamespace is removed to improve interoperability with other libraries using JSX. Instead, the JSX namespace is available from the React package:import { JSX } from 'react'useReducertypings: MostuseReducerusage should not require explicit type arguments.For example,
All Changes
React
useActionState()hook to update state based on the result of a Form Action (#27270, #27278, #27309, #27302, #27307, #27366, #27370, #27321, #27374, #27372, #27397, #27399, #27460, #28557, #27570, #27571, #28631, #28788, #29694, #29695, #29694, #29665, #28232, #28319 by @acdlite, @eps1lon, and @rickhanlonii)use()API to read resources in render (#25084, #25202, #25207, #25214, #25226, #25247, #25539, #25538, #25537, #25543, #25561, #25620, #25615, #25922, #25641, #25634, #26232, #26536, #26739, #28233 by @acdlite, @MofeiZ, @sebmarkbage, @sophiebits, @eps1lon, and @hansottowirtz)useOptimistic()hook to display mutated state optimistically during an async mutation (#26740, #26772, #27277, #27453, #27454, #27936 by @acdlite)initialValueargument touseDeferredValue()hook (#27500, #27509, #27512, #27888, #27550 by @acdlite)element.refaccess (#28348, #28464, #28731 by @acdlite)<Context>to mean<Context.Provider>(#28226 by @gaearon)info,group, andgroupCollapsedin StrictMode logging (#25172 by @timneutkens)useSyncExternalStore()hydration in StrictMode (#26791 by @sophiebits)componentWillUnmount()in StrictMode (#26842 by @tyao1)useState()anduseReducer()initializer functions in StrictMode (#28248 by @eps1lon)useId()in StrictMode (#25713 by @gnoff)act()no longer checksshouldYieldwhich can be inaccurate in test environments (#26317 by @acdlite)react.elementsymbol toreact.transitional.element(#28813 by @sebmarkbage)useSyncExternalStore()re-render (#27199 by @acdlite)useSyncExternalStore()dropped update when state is dispatched in render phase (#25578 by @pandaiolo)RefreshRuntime.findAffectedHostInstances(#30538 by @gaearon)cache()API (#27977, #28250 by @acdlite and @gnoff)propTypes(#28324, #28326 by @gaearon)defaultPropssupport, except for classes (#28733 by @acdlite)createFactory(#27798 by @kassens)React DOM
useFormStatus()hook to provide status information of the last form submission (#26719, #26722, #26788, #29019, #28728, #28413 by @acdlite and @eps1lon)preinit,preinitModule,preconnect,prefetchDNS,preload, andpreloadModuleAPIs.fetchPriorityto<img>and<link>(#25927 by @styfle)transformOriginprop (#26130 by @arav-ind)onScrollEndevent (#26789 by @devongovett)<hr>as child of<select>(#27632 by @SouSingh)inert(#24730 by @eps1lon)imageSizesandimageSrcSet(#22550 by @eps1lon)flushSyncexhausts queue even if something throws (#26366 by @acdlite)reactandreact-domversions don’t match (#29236 by @acdlite)srcsetandsrcare assigned last on<img>instances (#30340 by @gnoff)srcandhrefattributes (unless for<a href=”” />) (#18513, #28124 by @bvaughn and @eps1lon)scalestyle property (#25601 by @JonnyBurger)onChangeerror message for controlled<select>(#27740 by @Biki-das)render,hydrate,findDOMNode,unmountComponentAtNode,unstable_createEventHandle,unstable_renderSubtreeIntoContainer, andunstable_runWithPriority. MovecreateRootandhydrateRoottoreact-dom/client. (#28271 by @gnoff)test-utils(#28541 by @eps1lon)unstable_flushControlled(#26397 by @kassens)Configuration
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