Release notes
*Sourced from [react's releases](https://github.com/facebook/react/releases).*
> ## v16.6.1
> ## 16.6.1 (November 6, 2018)
>
> ### React DOM
>
> * Fallback should not remount every time a promise resolves. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#14083](https://github-redirect.dependabot.com/facebook/react/pull/14083))
> * Fix bug where Suspense keeps showing fallback even after everything finishes loading. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#14083](https://github-redirect.dependabot.com/facebook/react/pull/14083))
> * Fix unresolved default props in lifecycle methods of a lazy component. ([[**gaearon**](https://github.com/gaearon)](https://github.com/gaearon) in [#14112](https://github-redirect.dependabot.com/facebook/react/pull/14112))
> * Fix bug when recovering from an error thrown during complete phase. ([[**gaearon**](https://github.com/gaearon)](https://github.com/gaearon) in [#14104](https://github-redirect.dependabot.com/facebook/react/pull/14104))
>
> ### Scheduler (Experimental)
>
> * Switch from deadline object to `shouldYield` API. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#14025](https://github-redirect.dependabot.com/facebook/react/pull/14025))
>
> ## v16.6.0
> ## 16.6.0 (October 23, 2018)
>
> ### React
>
> * Add `React.memo()` as an alternative to `PureComponent` for functions. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#13748](https://github-redirect.dependabot.com/facebook/react/pull/13748))
> * Add `React.lazy()` for code splitting components. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#13885](https://github-redirect.dependabot.com/facebook/react/pull/13885))
> * `React.StrictMode` now warns about legacy context API. ([[**bvaughn**](https://github.com/bvaughn)](https://github.com/bvaughn) in [#13760](https://github-redirect.dependabot.com/facebook/react/pull/13760))
> * `React.StrictMode` now warns about `findDOMNode`. ([[**sebmarkbage**](https://github.com/sebmarkbage)](https://github.com/sebmarkbage) in [#13841](https://github-redirect.dependabot.com/facebook/react/pull/13841))
> * Rename `unstable_AsyncMode` to `unstable_ConcurrentMode`. ([[**trueadm**](https://github.com/trueadm)](https://github.com/trueadm) in [#13732](https://github-redirect.dependabot.com/facebook/react/pull/13732))
> * Rename `unstable_Placeholder` to `Suspense`, and `delayMs` to `maxDuration`. ([[**gaearon**](https://github.com/gaearon)](https://github.com/gaearon) in [#13799](https://github-redirect.dependabot.com/facebook/react/pull/13799) and [[**sebmarkbage**](https://github.com/sebmarkbage)](https://github.com/sebmarkbage) in [#13922](https://github-redirect.dependabot.com/facebook/react/pull/13922))
>
> ### React DOM
>
> * Add `contextType` as a more ergonomic way to subscribe to context from a class. ([[**bvaughn**](https://github.com/bvaughn)](https://github.com/bvaughn) in [#13728](https://github-redirect.dependabot.com/facebook/react/pull/13728))
> * Add `getDerivedStateFromError` lifecycle method for catching errors in a future asynchronous server-side renderer. ([[**bvaughn**](https://github.com/bvaughn)](https://github.com/bvaughn) in [#13746](https://github-redirect.dependabot.com/facebook/react/pull/13746))
> * Warn when `` is used instead of ``. ([[**trueadm**](https://github.com/trueadm)](https://github.com/trueadm) in [#13829](https://github-redirect.dependabot.com/facebook/react/pull/13829))
> * Fix gray overlay on iOS Safari. ([[**philipp-spiess**](https://github.com/philipp-spiess)](https://github.com/philipp-spiess) in [#13778](https://github-redirect.dependabot.com/facebook/react/pull/13778))
> * Fix a bug caused by overwriting `window.event` in development. ([[**sergei-startsev**](https://github.com/sergei-startsev)](https://github.com/sergei-startsev) in [#13697](https://github-redirect.dependabot.com/facebook/react/pull/13697))
>
> ### React DOM Server
>
> * Add support for `React.memo()`. ([[**alexmckenley**](https://github.com/alexmckenley)](https://github.com/alexmckenley) in [#13855](https://github-redirect.dependabot.com/facebook/react/pull/13855))
> * Add support for `contextType`. ([[**alexmckenley**](https://github.com/alexmckenley)](https://github.com/alexmckenley) and [[**sebmarkbage**](https://github.com/sebmarkbage)](https://github.com/sebmarkbage) in [#13889](https://github-redirect.dependabot.com/facebook/react/pull/13889))
>
> ### Scheduler (Experimental)
>
> * Rename the package to `scheduler`. ([[**gaearon**](https://github.com/gaearon)](https://github.com/gaearon) in [#13683](https://github-redirect.dependabot.com/facebook/react/pull/13683))
> * Support priority levels, continuations, and wrapped callbacks. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#13720](https://github-redirect.dependabot.com/facebook/react/pull/13720) and [#13842](https://github-redirect.dependabot.com/facebook/react/pull/13842))
> * Improve the fallback mechanism in non-DOM environments. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#13740](https://github-redirect.dependabot.com/facebook/react/pull/13740))
> * Schedule `requestAnimationFrame` earlier. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#13785](https://github-redirect.dependabot.com/facebook/react/pull/13785))
> * Fix the DOM detection to be more thorough. ([[**trueadm**](https://github.com/trueadm)](https://github.com/trueadm) in [#13731](https://github-redirect.dependabot.com/facebook/react/pull/13731))
> * Fix bugs with interaction tracing. ([[**bvaughn**](https://github.com/bvaughn)](https://github.com/bvaughn) in [#13590](https://github-redirect.dependabot.com/facebook/react/pull/13590))
> * Add the `envify` transform to the package. ([[**mridgway**](https://github.com/mridgway)](https://github.com/mridgway) in [#13766](https://github-redirect.dependabot.com/facebook/react/pull/13766))
>
> ## v16.5.2
> ... (truncated)
Changelog
*Sourced from [react's changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md).*
> ## [Unreleased]
>
>
> Changes that have landed in master but are not yet released.
> Click to see more.
>
>
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Bumps react from 16.4.2 to 16.6.3.
Release notes
*Sourced from [react's releases](https://github.com/facebook/react/releases).* > ## v16.6.1 > ## 16.6.1 (November 6, 2018) > > ### React DOM > > * Fallback should not remount every time a promise resolves. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#14083](https://github-redirect.dependabot.com/facebook/react/pull/14083)) > * Fix bug where Suspense keeps showing fallback even after everything finishes loading. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#14083](https://github-redirect.dependabot.com/facebook/react/pull/14083)) > * Fix unresolved default props in lifecycle methods of a lazy component. ([[**gaearon**](https://github.com/gaearon)](https://github.com/gaearon) in [#14112](https://github-redirect.dependabot.com/facebook/react/pull/14112)) > * Fix bug when recovering from an error thrown during complete phase. ([[**gaearon**](https://github.com/gaearon)](https://github.com/gaearon) in [#14104](https://github-redirect.dependabot.com/facebook/react/pull/14104)) > > ### Scheduler (Experimental) > > * Switch from deadline object to `shouldYield` API. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#14025](https://github-redirect.dependabot.com/facebook/react/pull/14025)) > > ## v16.6.0 > ## 16.6.0 (October 23, 2018) > > ### React > > * Add `React.memo()` as an alternative to `PureComponent` for functions. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#13748](https://github-redirect.dependabot.com/facebook/react/pull/13748)) > * Add `React.lazy()` for code splitting components. ([[**acdlite**](https://github.com/acdlite)](https://github.com/acdlite) in [#13885](https://github-redirect.dependabot.com/facebook/react/pull/13885)) > * `React.StrictMode` now warns about legacy context API. ([[**bvaughn**](https://github.com/bvaughn)](https://github.com/bvaughn) in [#13760](https://github-redirect.dependabot.com/facebook/react/pull/13760)) > * `React.StrictMode` now warns about `findDOMNode`. ([[**sebmarkbage**](https://github.com/sebmarkbage)](https://github.com/sebmarkbage) in [#13841](https://github-redirect.dependabot.com/facebook/react/pull/13841)) > * Rename `unstable_AsyncMode` to `unstable_ConcurrentMode`. ([[**trueadm**](https://github.com/trueadm)](https://github.com/trueadm) in [#13732](https://github-redirect.dependabot.com/facebook/react/pull/13732)) > * Rename `unstable_Placeholder` to `Suspense`, and `delayMs` to `maxDuration`. ([[**gaearon**](https://github.com/gaearon)](https://github.com/gaearon) in [#13799](https://github-redirect.dependabot.com/facebook/react/pull/13799) and [[**sebmarkbage**](https://github.com/sebmarkbage)](https://github.com/sebmarkbage) in [#13922](https://github-redirect.dependabot.com/facebook/react/pull/13922)) > > ### React DOM > > * Add `contextType` as a more ergonomic way to subscribe to context from a class. ([[**bvaughn**](https://github.com/bvaughn)](https://github.com/bvaughn) in [#13728](https://github-redirect.dependabot.com/facebook/react/pull/13728)) > * Add `getDerivedStateFromError` lifecycle method for catching errors in a future asynchronous server-side renderer. ([[**bvaughn**](https://github.com/bvaughn)](https://github.com/bvaughn) in [#13746](https://github-redirect.dependabot.com/facebook/react/pull/13746)) > * Warn when `Changelog
*Sourced from [react's changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md).* > ## [Unreleased] >> Changes that have landed in master but are not yet released. > Click to see more. >
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