15.2.1 (July 8, 2016)

React

• Fix errant warning about missing React element. (@gaearon in #7193)
• Better removal of dev-only code, leading to a small reduction in the minified production bundle size. (@gaearon in #7188, #7189)

React DOM

• Add stack trace to null input value warning. (@jimfb in #7040)
• Fix webcomponents example. (@jalexanderfox in #7057)
• Fix unstable_renderSubtreeIntoContainer so that context properly updates when linked to state. (@gaearon in #7125)
• Improve invariant wording for void elements. (@starkch in #7066)
• Ensure no errors are thrown due to event handlers in server rendering. (@rricard in #7127)
• Fix regression resulting in value-less submit and reset inputs removing the browser-default text. (@zpao in #7197)
• Fix regression resulting in empty name attribute being added to inputs when not provided. (@okonet in #7199)
• Fix issue with nested server rendering. (@Aweary in #7033)

React Perf Add-on

• Make ReactPerf.start() work properly during lifecycle methods. (@gaearon in #7208).

React CSSTransitionGroup Add-on

• Fix issue resulting in spurious unknown property warnings. (@batusai513 in #7165)

React Native Renderer

• Improve error handling in cross-platform touch event handling. (@yungsters in #7143)

15.2.0 (July 1, 2016)

React

• Add error codes to production invariants, with links to the view the full error text. (@keyanzhang in #6948)
• Include component stack information in PropType validation warnings. (@troydemonbreun in #6398, @sophiebits in #6771)
• Include component stack information in key warnings. (@keyanzhang in #6799)
• Stop validating props at mount time, only validate at element creation. (@keyanzhang in #6824)
• New invariant providing actionable error in missing instance case. (@yungsters in #6990)
• Add React.PropTypes.symbol to support ES2015 Symbols as props. (@puradox in #6377)
• Fix incorrect coercion of ref or key that are undefined in development (@gaearon in #6880)
• Fix a false positive when passing other element’s props to cloneElement (@ericmatthys in #6268)
• Warn if you attempt to define childContextTypes on a functional component (@Aweary in #6933)

React DOM

• Add warning for unknown properties on DOM elements. (@jimfb in #6800, @gm758 in #7152)
• Properly remove attributes from custom elements. (@grassator in #6748)
• Fix invalid unicode escape in attribute name regular expression. (@nbjahan in #6772)
• Add onLoad handling to <link> element. (@roderickhsiao in #6815)
• Add onError handling to <source> element. (@wadahiro in #6941)
• Handle value and defaultValue more accurately in the DOM. (@jimfb in #6406)
• Fix events issue in environments with mutated Object.prototype. (@Weizenlol in #6886)
• Fix issue where is="null" ended up in the DOM in Firefox. (@darobin in #6896)
• Improved performance of text escaping by using escape-html. (@aickin in #6862)
• Fix issue with dangerouslySetInnerHTML and SVG in Internet Explorer. (@joshhunt in #6982)
• Fix issue with <textarea> placeholders. (@jimfb in #7002)
• Fix controlled vs uncontrolled detection of <input type="radio"/>. (@jimfb in #7003)
• Improve performance of updating text content. (@trueadm in #7005)
• Ensure controlled <select> components behave the same on initial render as they do on updates. (@yiminghe in #5362)

React Perf Add-on

• Add isRunning() API. (@nfcampos in #6763)
• Improve accuracy of lifecycle hook timing. (@gaearon in #6858)
• Fix internal errors when using ReactPerf with portal components. (@gaearon in #6860)
• Fix performance regression. (@sophiebits in #6770)
• Add warning that ReactPerf is not enabled in production. (@sashashakun in #6884)

React CSSTransitionGroup Add-on

• Fix timing issue with null node. (@keyanzhang in #6958)

React Native Renderer

• Dependencies on React Native modules use CommonJS requires instead of providesModule. (@davidaurelio in #6715)

15.1.0 (May 20, 2016)

React

• Ensure we're using the latest object-assign, which has protection against a non-spec-compliant native Object.assign. (@zpao in #6681)
• Add a new warning to communicate that props objects passed to createElement must be plain objects. (@richardscarrott in #6134)
• Fix a batching bug resulting in some lifecycle methods incorrectly being called multiple times. (@sophiebits in #6650)

React DOM

• Fix regression in custom elements support. (@jscissr in #6570)
• Stop incorrectly warning about using onScroll event handler with server rendering. (@Aweary in #6678)
• Fix grammar in the controlled input warning. (@jakeboone02 in #6657)
• Fix issue preventing <object> nodes from being able to read <param> nodes in IE. (@syranide in #6691)
• Fix issue resulting in crash when using experimental error boundaries with server rendering. (@jimfb in #6694)
• Add additional information to the controlled input warning. (@borisyankov in #6341)

React Perf Add-on

• Completely rewritten to collect data more accurately and to be easier to maintain. (@gaearon in #6647, #6046)

React Native Renderer

• Remove some special cases for platform specific branching. (@sebmarkbage in #6660)
• Remove use of merge utility. (@sebmarkbage in #6634)
• Renamed some modules to better indicate usage (@javache in #6643)