16.8.2 (February 14, 2019)

React DOM

• Fix ReactDOM.render being ignored inside useEffect. (@gaearon in #14799)
• Fix a crash when unmounting empty portals. (@gaearon in #14820)
• Fix useImperativeHandle to work correctly when no deps are specified. (@gaearon in #14801)
• Fix crossOrigin attribute to work in SVG image elements. (@aweary in #14832)
• Fix a false positive warning when using Suspense with Hooks. (@gaearon in #14821)

React Test Utils and React Test Renderer

• Include component stack into the act() warning. (@threepointone in #14855)

Artifacts

• react: https://unpkg.com/react@16.8.2/umd/
• react-art: https://unpkg.com/react-art@16.8.2/umd/
• react-dom: https://unpkg.com/react-dom@16.8.2/umd/
• react-is: https://unpkg.com/react-is@16.8.2/umd/
• react-test-renderer: https://unpkg.com/react-test-renderer@16.8.2/umd/
• scheduler: https://unpkg.com/scheduler@0.13.2/umd/

16.8.1 (February 6, 2019)

React DOM and React Test Renderer

• Fix a crash when used together with an older version of React. (@bvaughn in #14770)

React Test Utils

• Fix a crash in Node environment. (@threepointone in #14768)

Artifacts

• react: https://unpkg.com/react@16.8.1/umd/
• react-art: https://unpkg.com/react-art@16.8.1/umd/
• react-dom: https://unpkg.com/react-dom@16.8.1/umd/
• react-is: https://unpkg.com/react-is@16.8.1/umd/
• react-test-renderer: https://unpkg.com/react-test-renderer@16.8.1/umd/
• scheduler: https://unpkg.com/scheduler@0.13.1/umd/

React

• Add Hooks — a way to use state and other React features without writing a class. (@acdlite et al. in #13968)
• Improve the useReducer Hook lazy initialization API. (@acdlite in #14723)

React DOM

• Bail out of rendering on identical values for useState and useReducer Hooks. (@acdlite in #14569)
• Use Object.is algorithm for comparing useState and useReducer values. (@Jessidhia in #14752)
• Don’t compare the first argument passed to useEffect/useMemo/useCallback Hooks. (@acdlite in #14594)
• Support synchronous thenables passed to React.lazy(). (@gaearon in #14626)
• Render components with Hooks twice in Strict Mode (DEV-only) to match class behavior. (@gaearon in #14654)
• Warn about mismatching Hook order in development. (@threepointone in #14585 and @acdlite in #14591)
• Effect clean-up functions must return either undefined or a function. All other values, including null, are not allowed. @acdlite in #14119

React Test Renderer and Test Utils

• Support Hooks in the shallow renderer. (@trueadm in #14567)
• Fix wrong state in shouldComponentUpdate in the presence of getDerivedStateFromProps for Shallow Renderer. (@chenesan in #14613)
• Add ReactTestRenderer.act() and ReactTestUtils.act() for batching updates so that tests more closely match real behavior. (@threepointone in #14744)

ESLint Plugin: React Hooks

• Initial release. (@calebmer in #13968)
• Fix reporting after encountering a loop. (@calebmer and @Yurickh in #14661)
• Don't consider throwing to be a rule violation. (@sophiebits in #14040)

Artifacts

• react: https://unpkg.com/react@16.8.0/umd/
• react-art: https://unpkg.com/react-art@16.8.0/umd/
• react-dom: https://unpkg.com/react-dom@16.8.0/umd/
• react-is: https://unpkg.com/react-is@16.8.0/umd/
• react-test-renderer: https://unpkg.com/react-test-renderer@16.8.0/umd/
• scheduler: https://unpkg.com/scheduler@0.13.0/umd/

React DOM

• Fix performance of React.lazy for large numbers of lazily-loaded components. (@acdlite in #14429)
• Clear fields on unmount to avoid memory leaks. (@trueadm in #14276)
• Fix bug with SSR and context when mixing react-dom/server@16.6 and react@<16.6. (@gaearon in #14291)
• Fix a performance regression in profiling mode. (@bvaughn in #14383)

Scheduler (Experimental)

• Post to MessageChannel instead of window. (@acdlite in #14234)
• Reduce serialization overhead. (@developit in #14249)
• Fix fallback to setTimeout in testing environments. (@bvaughn in #14358)
• Add methods for debugging. (@mrkev in #14053)

Artifacts

• react: https://unpkg.com/react@16.7.0/umd/
• react-art: https://unpkg.com/react-art@16.7.0/umd/
• react-dom: https://unpkg.com/react-dom@16.7.0/umd/
• react-is: https://unpkg.com/react-is@16.7.0/umd/
• react-test-renderer: https://unpkg.com/react-test-renderer@16.7.0/umd/
• scheduler: https://unpkg.com/scheduler@0.12.0/umd/

16.6.3 (November 12, 2018)

React DOM

• Fix bugs in Suspense and lazy. (@acdlite in #14133, #14157, and #14164)
• Fix highlighting of React.memo updates in React DevTools. (@bvaughn in #14141)
• Fix interaction of Suspense with the React Profiler. (@bvaughn in #14065)
• Fix a false positive warning when using Suspense. (@acdlite in #14158)

React DOM Server

• Fix incorrect sharing of context state between renderToNodeStream() calls. (@sebmarkbage in #14182)
• Add a warning about incorrect usage of the context API. (@trueadm in #14033)

16.6.1 (November 6, 2018)

React DOM

• Fallback should not remount every time a promise resolves. (@acdlite in #14083)
• Fix bug where Suspense keeps showing fallback even after everything finishes loading. (@acdlite in #14083)
• Fix a crash when Suspense finishes loading in IE11. (@sophiebits in #14126)
• Fix unresolved default props in lifecycle methods of a lazy component. (@gaearon in #14112)
• Fix bug when recovering from an error thrown during complete phase. (@gaearon in #14104)

Scheduler (Experimental)

• Switch from deadline object to shouldYield API. (@acdlite in #14025)

16.6.0 (October 23, 2018)

React

• Add React.memo() as an alternative to PureComponent for functions. (@acdlite in #13748)
• Add React.lazy() for code splitting components. (@acdlite in #13885)
• React.StrictMode now warns about legacy context API. (@bvaughn in #13760)
• React.StrictMode now warns about findDOMNode. (@sebmarkbage in #13841)
• Rename unstable_AsyncMode to unstable_ConcurrentMode. (@trueadm in #13732)
• Rename unstable_Placeholder to Suspense, and delayMs to maxDuration. (@gaearon in #13799 and @sebmarkbage in #13922)

React DOM

• Add contextType as a more ergonomic way to subscribe to context from a class. (@bvaughn in #13728)
• Add getDerivedStateFromError lifecycle method for catching errors in a future asynchronous server-side renderer. (@bvaughn in #13746)
• Warn when <Context> is used instead of <Context.Consumer>. (@trueadm in #13829)
• Fix gray overlay on iOS Safari. (@philipp-spiess in #13778)
• Fix a bug caused by overwriting window.event in development. (@sergei-startsev in #13697)

React DOM Server

• Add support for React.memo(). (@alexmckenley in #13855)
• Add support for contextType. (@alexmckenley and @sebmarkbage in #13889)

Scheduler (Experimental)

• Rename the package to scheduler. (@gaearon in #13683)
• Support priority levels, continuations, and wrapped callbacks. (@acdlite in #13720 and #13842)
• Improve the fallback mechanism in non-DOM environments. (@acdlite in #13740)
• Schedule requestAnimationFrame earlier. (@acdlite in #13785)
• Fix the DOM detection to be more thorough. (@trueadm in #13731)
• Fix bugs with interaction tracing. (@bvaughn in #13590)
• Add the envify transform to the package. (@mridgway in #13766)

React DOM

• Fixed a recent <iframe> regression (@JSteunou in #13650)
• Fix updateWrapper so that <textarea>s no longer re-render when data is unchanged (@joelbarbosa in #13643)

Schedule (Experimental)

• Renaming "tracking" API to "tracing" (@bvaughn in #13641)
• Add UMD production+profiling entry points (@bvaughn in #13642)
• Refactored schedule to remove some React-isms and improve performance for when deferred updates time out (@acdlite in #13582)

16.5.1 (September 13, 2018)

React

• Improve the warning when React.forwardRef receives an unexpected number of arguments. (@andresroberto in #13636)

React DOM

• Fix a regression in unstable exports used by React Native Web. (@aweary in #13598)
• Fix a crash when component defines a method called isReactComponent. (@gaearon in #13608)
• Fix a crash in development mode in IE9 when printing a warning. (@link-alex in #13620)
• Provide a better error message when running react-dom/profiling with schedule/tracking. (@bvaughn in #13605)
• If a ForwardRef component defines a displayName, use it in warnings. (@probablyup in #13615)

Schedule (Experimental)

• Add a separate profiling entry point at schedule/tracking-profiling. (@bvaughn in #13605)

16.5.0 (September 5, 2018)

React

• Add a warning if React.forwardRef render function doesn't take exactly two arguments (@bvaughn in #13168)
• Improve the error message when passing an element to createElement by mistake (@DCtheTall in #13131)
• Don't call profiler onRender until after mutations (@bvaughn in #13572)

React DOM

• Add support for React DevTools Profiler (@bvaughn in #13058)
• Add react-dom/profiling entry point alias for profiling in production (@bvaughn in #13570)
• Add onAuxClick event for browsers that support it (@jquense in #11571)
• Add movementX and movementY fields to mouse events (@jasonwilliams in #9018)
• Add tangentialPressure and twist fields to pointer events (@motiz88 in #13374)
• Minimally support iframes (nested browsing contexts) in selection event handling (@acusti in #12037)
• Support passing booleans to the focusable SVG attribute (@gaearon in #13339)
• Ignore <noscript> on the client when when hydrating (@Ephem in #13537)
• Fix gridArea to be treated as a unitless CSS property (@mgol in #13550)
• Fix incorrect data in compositionend event when typing Korean on IE11 (@crux153 in #12563)
• Fix a crash when using dynamic children in the <option> tag (@Slowyn in #13261, @gaearon in #13465)
• Fix the checked attribute not getting initially set on the input (@dilidili in #13114)
• Fix hydration of dangerouslySetInnerHTML when __html is not a string (@gaearon in #13353)
• Fix a warning about missing controlled onChange to fire on falsy values too (@nicolevy in #12628)
• Fix submit and reset buttons getting an empty label (@ellsclytn in #12780)
• Fix the onSelect event not being triggered after drag and drop (@gaearon in #13422)
• Fix the onClick event not working inside a portal on iOS (@aweary in #11927)
• Fix a performance issue when thousands of roots are re-rendered (@gaearon in #13335)
• Fix a performance regression that also caused onChange to not fire in some cases (@gaearon in #13423)
• Handle errors in more edge cases gracefully (@gaearon in #13237 and @acdlite in #13269)
• Don't use proxies for synthetic events in development (@gaearon in #12171)
• Warn when "false" or "true" is the value of a boolean DOM prop (@motiz88 in #13372)
• Warn when this.state is initialized to props (@veekas in #11658)
• Don't compare style on hydration in IE due to noisy false positives (@mgol in #13534)
• Include StrictMode in the component stack (@gaearon in #13240)
• Don't overwrite window.event in IE (@ConradIrwin in #11696)
• Improve component stack for the folder/index.js naming convention (@gaearon in #12059)
• Improve a warning when using getDerivedStateFromProps without initialized state (@flxwu in #13317)
• Improve a warning about invalid textarea usage (@raunofreiberg in #13361)
• Treat invalid Symbol and function values more consistently (@raunofreiberg in #13362 and #13389)
• Allow Electron <webview> tag without warnings (@philipp-spiess in #13301)
• Don't show the uncaught error addendum if e.preventDefault() was called (@gaearon in #13384)
• Warn about rendering Generators (@gaearon in #13312)
• Remove irrelevant suggestion of a legacy method from a warning (@zx6658 in #13169)
• Remove unstable_deferredUpdates in favor of unstable_scheduleWork from schedule (@gaearon in #13488)
• Fix unstable asynchronous mode from doing unnecessary work when an update takes too long (@acdlite in #13503)

React DOM Server

• Fix crash with nullish children when using dangerouslySetInnerHtml in a selected <option> (@mridgway in #13078)
• Fix crash when setTimeout is missing (@dustinsoftware in #13088)

React Test Renderer and Test Utils

• Fix this in a functional component for shallow renderer to be undefined (@koba04 in #13144)
• Deprecate a Jest-specific ReactTestUtils.mockComponent() helper (@bvaughn in #13193)
• Warn about ReactDOM.createPortal usage within the test renderer (@bvaughn in #12895)
• Improve a confusing error message (@gaearon in #13351)

React ART

• Add support for DevTools (@yunchancho in #13173)

Schedule (Experimental)

• New package for cooperatively scheduling work in a browser environment. It's used by React internally, but its public API is not finalized yet. (@flarnie in #12624)