v17.0.2

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React DOM

• Remove an unused dependency to address the SharedArrayBuffer cross-origin isolation warning. (@​koba04 and @​bvaughn in #​20831, #​20832, and #​20840)

v17.0.1

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React DOM

• Fix a crash in IE11. (@​gaearon in #​20071)

v17.0.0

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Today, we are releasing React 17!

Learn more about React 17 and how to update to it on the official React blog.

React

• Add react/jsx-runtime and react/jsx-dev-runtime for the new JSX transform. (@​lunaruan in #​18299)
• Build component stacks from native error frames. (@​sebmarkbage in #​18561)
• Allow to specify displayName on context for improved stacks. (@​eps1lon in #​18224)
• Prevent 'use strict' from leaking in the UMD bundles. (@​koba04 in #​19614)
• Stop using fb.me for redirects. (@​cylim in #​19598)

React DOM

• Delegate events to roots instead of document. (@​trueadm in #​18195 and others)
• Clean up all effects before running any next effects. (@​bvaughn in #​17947)
• Run useEffect cleanup functions asynchronously. (@​bvaughn in #​17925)
• Use browser focusin and focusout for onFocus and onBlur. (@​trueadm in #​19186)
• Make all Capture events use the browser capture phase. (@​trueadm in #​19221)
• Don't emulate bubbling of the onScroll event. (@​gaearon in #​19464)
• Throw if forwardRef or memo component returns undefined. (@​gaearon in #​19550)
• Remove event pooling. (@​trueadm in #​18969)
• Stop exposing internals that won’t be needed by React Native Web. (@​necolas in #​18483)
• Attach all known event listeners when the root mounts. (@​gaearon in #​19659)
• Disable console in the second render pass of DEV mode double render. (@​sebmarkbage in #​18547)
• Deprecate the undocumented and misleading ReactTestUtils.SimulateNative API. (@​gaearon in #​13407)
• Rename private field names used in the internals. (@​gaearon in #​18377)
• Don't call User Timing API in development. (@​gaearon in #​18417)
• Disable console during the repeated render in Strict Mode. (@​sebmarkbage in #​18547)
• In Strict Mode, double-render components without Hooks too. (@​eps1lon in #​18430)
• Allow calling ReactDOM.flushSync during lifecycle methods (but warn). (@​sebmarkbage in #​18759)
• Add the code property to the keyboard event objects. (@​bl00mber in #​18287)
• Add the disableRemotePlayback property for video elements. (@​tombrowndev in #​18619)
• Add the enterKeyHint property for input elements. (@​eps1lon in #​18634)
• Warn when no value is provided to <Context.Provider>. (@​charlie1404 in #​19054)
• Warn when memo or forwardRef components return undefined. (@​bvaughn in #​19550)
• Improve the error message for invalid updates. (@​JoviDeCroock in #​18316)
• Exclude forwardRef and memo from stack frames. (@​sebmarkbage in #​18559)
• Improve the error message when switching between controlled and uncontrolled inputs. (@​vcarl in #​17070)
• Keep onTouchStart, onTouchMove, and onWheel passive. (@​gaearon in #​19654)
• Fix setState hanging in development inside a closed iframe. (@​gaearon in #​19220)
• Fix rendering bailout for lazy components with defaultProps. (@​jddxf in #​18539)
• Fix a false positive warning when dangerouslySetInnerHTML is undefined. (@​eps1lon in #​18676)
• Fix Test Utils with non-standard require implementation. (@​just-boris in #​18632)
• Fix onBeforeInput reporting an incorrect event.type. (@​eps1lon in #​19561)
• Fix event.relatedTarget reported as undefined in Firefox. (@​claytercek in #​19607)
• Fix "unspecified error" in IE11. (@​hemakshis in #​19664)
• Fix rendering into a shadow root. (@​Jack-Works in #​15894)
• Fix movementX/Y polyfill with capture events. (@​gaearon in #​19672)
• Use delegation for onSubmit and onReset events. (@​gaearon in #​19333)
• Improve memory usage. (@​trueadm in #​18970)

React DOM Server

• Make useCallback behavior consistent with useMemo for the server renderer. (@​alexmckenley in #​18783)
• Fix state leaking when a function component throws. (@​pmaccart in #​19212)

React Test Renderer

• Improve findByType error message. (@​henryqdineen in #​17439)

Concurrent Mode (Experimental)

• Revamp the priority batching heuristics. (@​acdlite in #​18796)
• Add the unstable_ prefix before the experimental APIs. (@​acdlite in #​18825)
• Remove unstable_discreteUpdates and unstable_flushDiscreteUpdates. (@​trueadm in #​18825)
• Remove the timeoutMs argument. (@​acdlite in #​19703)
• Disable <div hidden /> prerendering in favor of a different future API. (@​acdlite in #​18917)
• Add unstable_expectedLoadTime to Suspense for CPU-bound trees. (@​acdlite in #​19936)
• Add an experimental unstable_useOpaqueIdentifier Hook. (@​lunaruan in #​17322)
• Add an experimental unstable_startTransition API. (@​rickhanlonii in #​19696)
• Using act in the test renderer no longer flushes Suspense fallbacks. (@​acdlite in #​18596)
• Use global render timeout for CPU Suspense. (@​sebmarkbage in #​19643)
• Clear the existing root content before mounting. (@​bvaughn in #​18730)
• Fix a bug with error boundaries. (@​acdlite in #​18265)
• Fix a bug causing dropped updates in a suspended tree. (@​acdlite in #​18384 and #​18457)
• Fix a bug causing dropped render phase updates. (@​acdlite in #​18537)
• Fix a bug in SuspenseList. (@​sebmarkbage in #​18412)
• Fix a bug causing Suspense fallback to show too early. (@​acdlite in #​18411)
• Fix a bug with class components inside SuspenseList. (@​sebmarkbage in #​18448)
• Fix a bug with inputs that may cause updates to be dropped. (@​jddxf in #​18515 and @​acdlite in #​18535)
• Fix a bug causing Suspense fallback to get stuck. (@​acdlite in #​18663)
• Don't cut off the tail of a SuspenseList if hydrating. (@​sebmarkbage in #​18854)
• Fix a bug in useMutableSource that may happen when getSnapshot changes. (@​bvaughn in #​18297)
• Fix a tearing bug in useMutableSource. (@​bvaughn in #​18912)
• Warn if calling setState outside of render but before commit. (@​sebmarkbage in #​18838)