Upgrading react-test-renderer 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.

Renames the "tracking" API to "tracing".

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, now available in the Experimental channel as createRoot and createSyncRoot.

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

Scheduler switches from the deadline object to the shouldYield API.

Deletes the experimental React Call Return API due to bundle size impact and API quality.

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 rendered.

When replacing <A /> with <B />, B.componentWillMount now always runs 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 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.

Server renderer rewritten: no markup validation, no comments for empty components, no data-reactid attributes.

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

Unknown props passed to DOM components now render 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 move to separate packages.

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

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 (CVE-2018-6341).

Adds a peer dependency on React 16.3+ for 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.

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

Stops publishing new releases on Bower starting with 16.1.0; old releases remain available and Bower configs can point to React UMD builds on unpkg.