Upgrading react 15 to 16

Removes ReactDOM.createRoot() callback params and adds warnings on usage.

Removes unstable_ConcurrentMode in favor of unstable_createRoot.

Renames unstable_AsyncMode to unstable_ConcurrentMode.

Renames unstable_Placeholder to Suspense and delayMs to maxDuration.

Renames the Scheduler package to scheduler.

Removes unstable_deferredUpdates in favor of unstable_scheduleWork from schedule.

Removes useSyncScheduling from the React Reconciler host config.

Calling setState with null no longer triggers an update.

componentDidUpdate no longer receives the prevContext parameter.

Shallow renderer no longer calls componentDidUpdate() because DOM refs are not available.

Shallow renderer no longer implements unstable_batchedUpdates().

Errors in render and lifecycle methods now unmount the component tree by default.

Removes the react-with-addons.js build; compatible addons are published separately on npm.

Removes the experimental unstable_createRoot and unstable_createSyncRoot APIs from React DOM.

Requires effect clean-up functions to return either undefined or a function; all other values, including null, are not allowed.

Scheduler switches from the deadline object to the shouldYield API.

Renames the experimental "tracking" API to "tracing".

Deletes the experimental React Call Return feature because it affected bundle size and the API wasn't good enough.

Replaces React.unstable_AsyncComponent with React.unstable_AsyncMode.

Changes the hydration API for better Flow typing.

ReactDOM.render() and ReactDOM.unstable_renderIntoContainer() now return null when called inside a lifecycle method.

Calling setState directly in render now always causes an update.

The setState callback now fires immediately after componentDidMount or componentDidUpdate instead of after all components have rendered.

When replacing <A /> with <B />, B.componentWillMount now always happens before A.componentWillUnmount.

Changing a component's ref now detaches later, when applying DOM changes, instead of before render.

Re-rendering into a container modified by something other than React now emits a warning.

Non-unique keys may now cause children to be duplicated and/or omitted instead of raising a hard error.

ReactDOM.unstable_batchedUpdates now only takes one extra argument after the callback.

Single-file browser build names and paths changed to distinguish development and production builds.

The server renderer is rewritten: no markup validation, no comments for empty components, and no data-reactid attributes.

Hydrating server rendered HTML now requires ReactDOM.hydrate instead of ReactDOM.render.

Unknown props passed to DOM components are now rendered in the DOM for valid values.

Removes 15.x deprecations from core: React.createClass, React.PropTypes, React.DOM, react-addons-test-utils and shallow renderer.

Changes internal event names, which can break third-party packages relying on React internals in unsupported ways.

Changes the experimental React Reconciler host config shape to be flat without nested objects.

Fixes a potential XSS vulnerability when an attacker controls an attribute name in React DOM Server.

Adds a peer dependency on React 16.3+ to Create Subscription.

Deprecates React.createFactory().

Deprecates unstable_createPortal.

Deprecates old names for the UNSAFE_* lifecycle methods.

Deprecates javascript: URLs as a common attack surface.

Deprecates uncommon module pattern (factory) components.

Deprecates the Jest-specific ReactTestUtils.mockComponent() helper.

Deprecates ReactDOM.unstable_createPortal() in favor of ReactDOM.createPortal().