React: v0.12.0 Release

React Core

Breaking Changes

• key and ref moved off props object, now accessible on the element directly
• React is now BSD licensed with accompanying Patents grant
• Default prop resolution has moved to Element creation time instead of mount time, making them effectively static
• React.__internals is removed - it was exposed for DevTools which no longer needs access
• Composite Component functions can no longer be called directly - they must be wrapped with React.createFactory first. This is handled for you when using JSX.

New Features

• Spread operator ({...}) introduced to deprecate this.transferPropsTo
• Added support for more HTML attributes: acceptCharset, classID, manifest

Deprecations

• React.renderComponent --> React.render
• React.renderComponentToString --> React.renderToString
• React.renderComponentToStaticMarkup --> React.renderToStaticMarkup
• React.isValidComponent --> React.isValidElement
• React.PropTypes.component --> React.PropTypes.element
• React.PropTypes.renderable --> React.PropTypes.node
• DEPRECATED React.isValidClass
• DEPRECATED instance.transferPropsTo
• DEPRECATED Returning false from event handlers to preventDefault
• DEPRECATED Convenience Constructor usage as function, instead wrap with React.createFactory
• DEPRECATED use of key={null} to assign implicit keys

Bug Fixes

• Better handling of events and updates in nested results, fixing value restoration in "layered" controlled components
• Correctly treat event.getModifierState as case sensitive
• Improved normalization of event.charCode
• Better error stacks when involving autobound methods
• Removed DevTools message when the DevTools are installed
• Correctly detect required language features across browsers
• Fixed support for some HTML attributes:
  • list updates correctly now
  • scrollLeft, scrollTop removed, these should not be specified as props
• Improved error messages

React With Addons

New Features

• React.addons.batchedUpdates added to API for hooking into update cycle

Breaking Changes

• React.addons.update uses assign instead of copyProperties which does hasOwnProperty checks. Properties on prototypes will no longer be updated correctly.

Bug Fixes

• Fixed some issues with CSS Transitions

JSX

Breaking Changes

• Enforced convention: lower case tag names are always treated as HTML tags, upper case tag names are always treated as composite components
• JSX no longer transforms to simple function calls

New Features

• @jsx React.DOM no longer required
• spread ({...}) operator introduced to allow easier use of props

Bug Fixes

• JSXTransformer: Make sourcemaps an option when using APIs directly (eg, for react-rails)