Extracted from https://github.com/facebook/react/issues/12643.

We're currently diff a host node in the complete phase even if it has bailed out in the begin phase. By itself, this just means we're doing a little bit more work than necessary. But it also has some observable effects. In particular, https://github.com/facebook/react/issues/13424 (which by itself would be very rare and probably not worth fixing) is made worse because we end up committing update to inputs from another component.

I have a fix for this in https://github.com/facebook/react/pull/13423. Filing this for posterity.
id: number,
  children: Array<Instance | TextInstance>,
  prop: any,
|};
type TextInstance = {|text: string, id: number|};
const NO_CONTEXT = {};
const UPDATE_SIGNAL = {};
if (__DEV__) {
  Object.freeze(NO_CONTEXT);
  Object.freeze(UPDATE_SIGNAL);
}
function createReactNoop(reconciler: Function, useMutation: boolean) {
  let scheduledCallback = null;
  let instanceCounter = 0;
  function appendChildToContainerOrInstance(
    parentInstance: Container | Instance,
    child: Instance | TextInstance,
  ): void {
    const index = parentInstance.children.indexOf(child);
    if (index !== -1) {
      parentInstance.children.splice(index, 1);
    }
    parentInstance.children.push(child);
  }
  function appendChildToContainer(
    parentInstance: Container,
    child: Instance | TextInstance,
  ): void {
    if (typeof parentInstance.rootID !== 'string') {