0.5.0 (October 16, 2013)

React

• Memory usage improvements - reduced allocations in core which will help with GC pauses
• Performance improvements - in addition to speeding things up, we made some tweaks to stay out of slow path code in V8 and Nitro.
• Standardized prop -> DOM attribute process. This previously resulting in additional type checking and overhead as well as confusing cases for users. Now we will always convert your value to a string before inserting it into the DOM.
• Support for Selection events.
• Support for Composition events.
• Support for additional DOM properties (charSet, content, form, httpEquiv, rowSpan, autoCapitalize).
• Support for additional SVG properties (rx, ry).
• Support for using getInitialState and getDefaultProps in mixins.
• Support mounting into iframes.
• Bug fixes for controlled form components.
• Bug fixes for SVG element creation.
• Added React.version.
• Added React.isValidClass - Used to determine if a value is a valid component constructor.
• Removed React.autoBind - This was deprecated in v0.4 and now properly removed.
• Renamed React.unmountAndReleaseReactRootNode to React.unmountComponentAtNode.
• Began laying down work for refined performance analysis.
• Better support for server-side rendering - react-page has helped improve the stability for server-side rendering.
• Made it possible to use React in environments enforcing a strict Content Security Policy. This also makes it possible to use React to build Chrome extensions.

React with Addons (New!)

• Introduced a separate build with several "addons" which we think can help improve the React experience. We plan to deprecate this in the long-term, instead shipping each as standalone pieces. Read more in the docs.

JSX

• No longer transform class to className as part of the transform! This is a breaking change - if you were using class, you must change this to className or your components will be visually broken.
• Added warnings to the in-browser transformer to make it clear it is not intended for production use.
• Improved compatibility for Windows
• Improved support for maintaining line numbers when transforming.

0.4.0 (July 17, 2013)

React

• Switch from using id attribute to data-reactid to track DOM nodes. This allows you to integrate with other JS and CSS libraries more easily.
• Support for more DOM elements and attributes (e.g., <canvas>)
• Improved server-side rendering APIs. React.renderComponentToString(<component>, callback) allows you to use React on the server and generate markup which can be sent down to the browser.
• prop improvements: validation and default values. Read our blog post for details...
• Support for the key prop, which allows for finer control over reconciliation. Read the docs for details...
• Removed React.autoBind. Read our blog post for details...
• Improvements to forms. We've written wrappers around <input>, <textarea>, <option>, and <select> in order to standardize many inconsistencies in browser implementations. This includes support for defaultValue, and improved implementation of the onChange event, and circuit completion. Read the docs for details...
• We've implemented an improved synthetic event system that conforms to the W3C spec.
• Updates to your component are batched now, which may result in a significantly faster re-render of components. this.setState now takes an optional callback as it's second parameter. If you were using onClick={this.setState.bind(this, state)} previously, you'll want to make sure you add a third parameter so that the event is not treated as the callback.

JSX

• Support for comment nodes <div>{/* this is a comment and won't be rendered */}</div>
• Children are now transformed directly into arguments instead of being wrapped in an array E.g. <div><Component1/><Component2/></div> is transformed into React.DOM.div(null, Component1(null), Component2(null)). Previously this would be transformed into React.DOM.div(null, [Component1(null), Component2(null)]). If you were using React without JSX previously, your code should still work.

react-tools

• Fixed a number of bugs when transforming directories
• No longer re-write require()s to be relative unless specified

0.3.0 (May 29, 2013)

• Initial public release