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This PR contains the following updates:
16.14.0
->18.2.0
16.14.0
->18.2.0
Release Notes
facebook/react (react)
v18.2.0
Compare Source
React DOM
onRecoverableError
. (@gnoff in #24591)document
causing a blank page on mismatch. (@gnoff in #24523)setState
in Safari when adding an iframe. (@gaearon in #24459)React DOM Server
<title>
elements to match the browser constraints. (@gnoff in #24679)highWaterMark
to0
. (@jplhomer in #24641)Server Components (Experimental)
useId()
inside Server Components. (@gnoff in #24172)v18.1.0
Compare Source
React DOM
react-dom/client
when using UMD bundle. (@alireza-molaee in #24274)suppressHydrationWarning
to work in production too. (@gaearon in #24271)componentWillUnmount
firing twice inside of Suspense. (@acdlite in #24308)useDeferredValue
causing an infinite loop when passed an unmemoized value. (@acdlite in #24247)setState
loop inuseEffect
. (@gaearon in #24298)setState
inuseInsertionEffect
. (@gaearon in #24295)React DOM Server
bootstrapScriptContent
contents. (@gnoff in #24385)renderToPipeableStream
. (@gnoff in #24291)ESLint Plugin: React Hooks
Use Subscription
use-sync-external-store
shim. (@gaearon in #24289)v18.0.0
Compare Source
Below is a list of all new features, APIs, deprecations, and breaking changes.
Read React 18 release post and React 18 upgrade guide for more information.
New Features
React
useId
is a new hook for generating unique IDs on both the client and server, while avoiding hydration mismatches. It is primarily useful for component libraries integrating with accessibility APIs that require unique IDs. This solves an issue that already exists in React 17 and below, but it’s even more important in React 18 because of how the new streaming server renderer delivers HTML out-of-order.startTransition
anduseTransition
let you mark some state updates as not urgent. Other state updates are considered urgent by default. React will allow urgent state updates (for example, updating a text input) to interrupt non-urgent state updates (for example, rendering a list of search results).useDeferredValue
lets you defer re-rendering a non-urgent part of the tree. It is similar to debouncing, but has a few advantages compared to it. There is no fixed time delay, so React will attempt the deferred render right after the first render is reflected on the screen. The deferred render is interruptible and doesn't block user input.useSyncExternalStore
is a new hook that allows external stores to support concurrent reads by forcing updates to the store to be synchronous. It removes the need foruseEffect
when implementing subscriptions to external data sources, and is recommended for any library that integrates with state external to React.useInsertionEffect
is a new hook that allows CSS-in-JS libraries to address performance issues of injecting styles in render. Unless you’ve already built a CSS-in-JS library we don’t expect you to ever use this. This hook will run after the DOM is mutated, but before layout effects read the new layout. 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.React DOM Client
These new APIs are now exported from
react-dom/client
:createRoot
: New method to create a root torender
orunmount
. Use it instead ofReactDOM.render
. New features in React 18 don't work without it.hydrateRoot
: New method to hydrate a server rendered application. Use it instead ofReactDOM.hydrate
in conjunction with the new React DOM Server APIs. New features in React 18 don't work without it.Both
createRoot
andhydrateRoot
accept a new option calledonRecoverableError
in case you want to be notified when React recovers from errors during rendering or hydration for logging. By default, React will usereportError
, orconsole.error
in the older browsers.React DOM Server
These new APIs are now exported from
react-dom/server
and have full support for streaming Suspense on the server:renderToPipeableStream
: for streaming in Node environments.renderToReadableStream
: for modern edge runtime environments, such as Deno and Cloudflare workers.The existing
renderToString
method keeps working but is discouraged.v17.0.2
Compare Source
React DOM
SharedArrayBuffer
cross-origin isolation warning. (@koba04 and @bvaughn in #20831, #20832, and #20840)v17.0.1
Compare Source
React DOM
v17.0.0
Compare Source
Today, we are releasing React 17!
Learn more about React 17 and how to update to it on the official React blog.
React
react/jsx-runtime
andreact/jsx-dev-runtime
for the new JSX transform. (@lunaruan in #18299)displayName
on context for improved stacks. (@eps1lon in #18224)'use strict'
from leaking in the UMD bundles. (@koba04 in #19614)fb.me
for redirects. (@cylim in #19598)React DOM
document
. (@trueadm in #18195 and others)useEffect
cleanup functions asynchronously. (@bvaughn in #17925)focusin
andfocusout
foronFocus
andonBlur
. (@trueadm in #19186)Capture
events use the browser capture phase. (@trueadm in #19221)onScroll
event. (@gaearon in #19464)forwardRef
ormemo
component returnsundefined
. (@gaearon in #19550)console
in the second render pass of DEV mode double render. (@sebmarkbage in #18547)ReactTestUtils.SimulateNative
API. (@gaearon in #13407)ReactDOM.flushSync
during lifecycle methods (but warn). (@sebmarkbage in #18759)code
property to the keyboard event objects. (@bl00mber in #18287)disableRemotePlayback
property forvideo
elements. (@tombrowndev in #18619)enterKeyHint
property forinput
elements. (@eps1lon in #18634)value
is provided to<Context.Provider>
. (@charlie1404 in #19054)memo
orforwardRef
components returnundefined
. (@bvaughn in #19550)onTouchStart
,onTouchMove
, andonWheel
passive. (@gaearon in #19654)setState
hanging in development inside a closed iframe. (@gaearon in #19220)defaultProps
. (@jddxf in #18539)dangerouslySetInnerHTML
isundefined
. (@eps1lon in #18676)require
implementation. (@just-boris in #18632)onBeforeInput
reporting an incorrectevent.type
. (@eps1lon in #19561)event.relatedTarget
reported asundefined
in Firefox. (@claytercek in #19607)movementX/Y
polyfill with capture events. (@gaearon in #19672)onSubmit
andonReset
events. (@gaearon in #19333)React DOM Server
useCallback
behavior consistent withuseMemo
for the server renderer. (@alexmckenley in #18783)React Test Renderer
findByType
error message. (@henryqdineen in #17439)Concurrent Mode (Experimental)
unstable_
prefix before the experimental APIs. (@acdlite in #18825)unstable_discreteUpdates
andunstable_flushDiscreteUpdates
. (@trueadm in #18825)timeoutMs
argument. (@acdlite in #19703)<div hidden />
prerendering in favor of a different future API. (@acdlite in #18917)unstable_expectedLoadTime
to Suspense for CPU-bound trees. (@acdlite in #19936)unstable_useOpaqueIdentifier
Hook. (@lunaruan in #17322)unstable_startTransition
API. (@rickhanlonii in #19696)act
in the test renderer no longer flushes Suspense fallbacks. (@acdlite in #18596)useMutableSource
that may happen whengetSnapshot
changes. (@bvaughn in #18297)useMutableSource
. (@bvaughn in #18912)Configuration
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