React Core
Breaking Changes
getDefaultProps()
is now called once per class and shared across all instancesMyComponent()
now returns a descriptor, not an instanceReact.isValidComponent
andReact.PropTypes.component
validate descriptors, not component instances- Custom
propType
validators should return anError
instead of logging directly
New Features
- Rendering to
null
- Keyboard events include normalized
e.key
ande.getModifierState()
properties - New normalized
onBeforeInput
event React.Children.count
has been added as a helper for counting the number of children
Bug Fixes
- Re-renders are batched in more cases
- Events:
e.view
properly normalized - Added Support for more HTML attributes (
coords
,crossOrigin
,download
,hrefLang
,mediaGroup
,muted
,scrolling
,shape
,srcSet
,start
,useMap
) - Improved SVG support
- Changing
className
on a mounted SVG component now works correctly - Added support for elements
mask
andtspan
- Added support for attributes
dx
,dy
,fillOpacity
,fontFamily
,fontSize
,markerEnd
,markerMid
,markerStart
,opacity
,patternContentUnits
,patternUnits
,preserveAspectRatio
,strokeDasharray
,strokeOpacity
- Changing
- CSS property names with vendor prefixes (
Webkit
,ms
,Moz
,O
) are now handled properly - Duplicate keys no longer cause a hard error; now a warning is logged (and only one of the children with the same key is shown)
img
event listeners are now unbound properly, preventing the error "Two valid but unequal nodes with the samedata-reactid
"- Added explicit warning when missing polyfills
React With Addons
- PureRenderMixin: a mixin which helps optimize "pure" components
- Perf: a new set of tools to help with performance analysis
- Update: New
$apply
command to transform values - TransitionGroup bug fixes with null elements, Android
React NPM Module
- Now includes the pre-built packages under
dist/
. envify
is properly listed as a dependency instead of a peer dependency
JSX
- Added support for namespaces, eg
<Components.Checkbox />
- JSXTransformer
- Enable the same
harmony
features available in the command line with<script type="text/jsx;harmony=true">
- Scripts are downloaded in parallel for more speed. They are still executed in order (as you would expect with normal script tags)
- Fixed a bug preventing sourcemaps from working in Firefox
- Enable the same
React Tools Module
- Improved readme with usage and API information
- Improved ES6 transforms available with
--harmony
option - Added
--source-map-inline
option to thejsx
executable - New
transformWithDetails
API which gives access to the raw sourcemap data