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react: 16.14.0 → 17.0.0 · Semverse

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react

React is a JavaScript library for building user interfaces.

Latest 19.3.02,957 published versionsreact/react

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20 Oct 2020 · Newest first

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Last checked 20 Sept 2026, 12:11 UTC

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17.0.0 — breaking signals — additional changes to review

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Showing 1 of 1 releases. Full release notes.

17.0.0

Breaking signals20 Oct 2020GitHub Release

Signals highlight changes worth reviewing. They cannot determine whether your application is affected.

Potential breaking changes

The release increments the stable major version.
16.14.0 → 17.0.0

Additional changes to review1 matched termMatched wording:no longerThese matches may be harmless in context. Expand to see the excerpts.

The changelog contains the phrase “no longer”; its impact needs context.
Using act in the test renderer no longer flushes Suspense fallbacks. (@acdlite in #18596)

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)

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 )

Artifacts

react: https://unpkg.com/react@17.0.1/umd/
react-art: https://unpkg.com/react-art@17.0.1/umd/
react-dom: https://unpkg.com/react-dom@17.0.1/umd/
react-is: https://unpkg.com/react-is@17.0.1/umd/
react-test-renderer: https://unpkg.com/react-test-renderer@17.0.1/umd/
scheduler: https://unpkg.com/scheduler@0.20.1/umd/

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)

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)