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React

• Add a new officially supported context API
• Add a new?React.createRef()?API as an ergonomic alternative to callback refs.
• Add a new?React.forwardRef()?API to let components forward their refs to a child.?
• Fix a false positive warning in IE11 when using?React.Fragment
• Replace?React.unstable_AsyncComponent?with?React.unstable_AsyncMode
• Improve the error message when calling?setState()?on an unmounted component.

React DOM

• Add a new?getDerivedStateFromProps()?lifecycle and?UNSAFE_?aliases for the legacy lifecycles.?
• Add a new?getSnapshotBeforeUpdate()?lifecycle
• Add a new?<React.StrictMode>?wrapper to help prepare apps for async rendering.?
• Add support for?onLoad?and?onError?events on the?<link>?tag
• Add support for?noModule?boolean attribute on the?<script>?tag
• Fix minor DOM input bugs in IE and Safari
• Correctly detect Ctrl + Enter in?onKeyPress?in more browsers
• Fix containing elements getting focused on SSR markup mismatch
• Fix?value?and?defaultValue?to ignore Symbol values
• Fix refs to class components not getting cleaned up when the attribute is removed.?
• Throw with a meaningful message if the component runs after jsdom has been destroyed.?
• Don't crash if there is a global variable called?opera?with a?null?value
• Don't check for old versions of Opera
• Deduplicate warning messages about?<option selected>
• Deduplicate warning messages about invalid callback
• Deprecate?ReactDOM.unstable_createPortal()?in favor of?ReactDOM.createPortal().?
• Don't emit User Timing entries for context types
• Improve the error message when context consumer child isn't a function.?
• Improve the error message when adding a ref to a functional component.?

React DOM Server

• Prevent an infinite loop when attempting to render portals with SSR.
• Warn if a class doesn't extend?React.Component.?
• Fix an issue with?this.state?of different components getting mixed up.
• Provide a better message when component type is undefined.

React Test Renderer

• Fix handling of fragments in?toTree().?
• Shallow renderer should assign state to?null?for components that don't set it.?
• Shallow renderer should filter legacy context according to?contextTypes.?
• Add an unstable API for testing asynchronous rendering.

React Is (New)

• First release of the?new package?that libraries can use to detect different React node types.?
• Add?ReactIs.isValidElementType()?to help higher-order components validate their inputs.?

React Lifecycles Compat (New)

• First release of the?new package?to help library developers target multiple versions of React.?

Create Subscription (New)

• First release of the?new package?to subscribe to external data sources safely for async rendering.?

React Reconciler (Experimental)

• Expose?react-reconciler/persistent?for building renderers that use persistent data structures.?
• Pass host context to?finalizeInitialChildren().
• Remove?useSyncScheduling?from the host config.

React Call Return (Experimental)

• Fix a crash on updates.

ÏÂÔصØÖ·£ºhttps://github.com/facebook/react/releases/tag/v16.3.0