v16.8.6

Compare Source

React DOM

• Fix an incorrect bailout in useReducer(). (@​acdlite in #​15124)
• Fix iframe warnings in Safari DevTools. (@​renanvalentin in #​15099)
• Warn if contextType is set to Context.Consumer instead of Context. (@​aweary in #​14831)
• Warn if contextType is set to invalid values. (@​gaearon in #​15142)

v16.8.5

Compare Source

React DOM

• Don't set the first option as selected in select tag with size attribute. (@​kulek1 in #​14242)
• Improve the useEffect(async () => ...) warning message. (@​gaearon in #​15118)
• Improve the error message sometimes caused by duplicate React. (@​jaredpalmer in #​15139)

React DOM Server

• Improve the useLayoutEffect warning message when server rendering. (@​gaearon in #​15158)

React Shallow Renderer

• Fix setState in shallow renderer to work with Hooks. (@​gaearon in #​15120)
• Fix shallow renderer to support React.memo. (@​aweary in #​14816)
• Fix shallow renderer to support Hooks inside forwardRef. (@​eps1lon in #​15100)

v16.8.4

Compare Source

React DOM and other renderers

• Fix a bug where DevTools caused a runtime error when inspecting a component that used a useContext hook. (@​bvaughn in #​14940)

v16.8.3

Compare Source

React DOM

• Fix a bug that caused inputs to behave incorrectly in UMD builds. (@​gaearon in #​14914)
• Fix a bug that caused render phase updates to be discarded. (@​gaearon in #​14852)

React DOM Server

• Unwind the context stack when a stream is destroyed without completing, to prevent incorrect values during a subsequent render. (@​overlookmotel in #​14706)

ESLint Plugin for React Hooks

• Add a new recommended exhaustive-deps rule. (@​gaearon in #​14636)

v16.8.2

Compare Source

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)

v16.8.1

Compare Source

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)

v16.8.0

Compare Source

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)

v16.7.0

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/[email protected] 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)