v16.6.1

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)

v16.6.0

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)

v16.5.2

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)

v16.5.1

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)

v16.5.0

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)

v16.4.2

16.4.2 (August 1, 2018)

React DOM Server

• Fix a potential XSS vulnerability when the attacker controls an attribute name (CVE-2018-6341). This fix is available in the latest react-dom@16.4.2, as well as in previous affected minor versions: react-dom@16.0.1, react-dom@16.1.2, react-dom@16.2.1, and react-dom@16.3.3. (@gaearon in #13302)

• Fix a crash in the server renderer when an attribute is called hasOwnProperty. This fix is only available in react-dom@16.4.2. (@gaearon in #13303)

v16.4.1

16.4.1 (June 13, 2018)

React

• You can now assign propTypes to components returned by React.ForwardRef. (@bvaughn in #12911)

React DOM

• Fix a crash when the input type changes from some other types to text. (@spirosikmd in #12135)
• Fix a crash in IE11 when restoring focus to an SVG element. (@ThaddeusJiang in #12996)
• Fix a range input not updating in some cases. (@Illu in #12939)
• Fix input validation triggering unnecessarily in Firefox. (@nhunzaker in #12925)
• Fix an incorrect event.target value for the onChange event in IE9. (@nhunzaker in #12976)
• Fix a false positive error when returning an empty <React.Fragment /> from a component. (@philipp-spiess in #12966)

React DOM Server

• Fix an incorrect value being provided by new context API. (@ericsoderberghp in #12985, @gaearon in #13019)

React Test Renderer

• Allow multiple root children in test renderer traversal API. (@gaearon in #13017)
• Fix getDerivedStateFromProps() in the shallow renderer to not discard the pending state. (@fatfisz in #13030)

v16.4.0

React

• Add a new experimental React.unstable_Profiler component for measuring performance. (@bvaughn in #12745)

React DOM

• Add support for the Pointer Events specification. (@philipp-spiess in #12507)
• Properly call getDerivedStateFromProps() regardless of the reason for re-rendering. (@acdlite in #12600 and #12802)
• Fix a bug that prevented context propagation in some cases. (@gaearon in #12708)
• Fix re-rendering of components using forwardRef() on a deeper setState(). (@gaearon in #12690)
• Fix some attributes incorrectly getting removed from custom element nodes. (@airamrguez in #12702)
• Fix context providers to not bail out on children if there's a legacy context provider above. (@gaearon in #12586)
• Add the ability to specify propTypes on a context provider component. (@nicolevy in #12658)
• Fix a false positive warning when using react-lifecycles-compat in <StrictMode>. (@bvaughn in #12644)
• Warn when the forwardRef() render function has propTypes or defaultProps. (@bvaughn in #12644)
• Improve how forwardRef() and context consumers are displayed in the component stack. (@sophiebits in #12777)
• Change internal event names. This can break third-party packages that rely on React internals in unsupported ways. (@philipp-spiess in #12629)

React Test Renderer

• Fix the getDerivedStateFromProps() support to match the new React DOM behavior. (@koba04 in #12676)
• Fix a testInstance.parent crash when the parent is a fragment or another special node. (@gaearon in #12813)
• forwardRef() components are now discoverable by the test renderer traversal methods. (@gaearon in #12725)
• Shallow renderer now ignores setState() updaters that return null or undefined. (@koba04 in #12756)

React ART

• Fix reading context provided from the tree managed by React DOM. (@acdlite in #12779)

React Call Return (Experimental)

• This experiment was deleted because it was affecting the bundle size and the API wasn't good enough. It's likely to come back in the future in some other form. (@gaearon in #12820)

React Reconciler (Experimental)

• The new host config shape is flat and doesn't use nested objects. (@gaearon in #12792)

v16.3.2

16.3.2 (April 16, 2018)

React

• Improve the error message when passing null or undefined to React.cloneElement. (@nicolevy in #12534)

React DOM

• Fix an IE crash in development when using <StrictMode>. (@bvaughn in #12546)
• Fix labels in User Timing measurements for new component types. (@bvaughn in #12609)
• Improve the warning about wrong component type casing. (@nicolevy in #12533)
• Improve general performance in development mode. (@gaearon in #12537)
• Improve performance of the experimental unstable_observedBits API with nesting. (@gaearon in #12543)

React Test Renderer

• Add a UMD build. (@bvaughn in #12594)

v16.3.1

16.3.1 (April 3, 2018)

React

• Fix a false positive warning in IE11 when using Fragment. (@heikkilamarko in #12504)
• Prefix a private API. (@Andarist in #12501)
• Improve the warning when calling setState() in constructor. (@gaearon in #12532)

React DOM

• Fix getDerivedStateFromProps() not getting applied in some cases. (@acdlite in #12528)
• Fix a performance regression in development mode. (@gaearon in #12510)
• Fix error handling bugs in development mode. (@gaearon and @acdlite in #12508)
• Improve user timing API messages for profiling. (@flarnie in #12384)

Create Subscription

• Set the package version to be in sync with React releases. (@bvaughn in #12526)
• Add a peer dependency on React 16.3+. (@NMinhNguyen in #12496)