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.
const component = (componentOrElement: any);
      if (typeof component.id === 'number') {
        return component;
      }
      return NoopRenderer.findHostInstance(component);
    },
    flushDeferredPri(timeout: number = Infinity): Array<mixed> {
      
      
      
      const n = timeout / 5 - 1;
      let values = [];
      
      for (const value of flushUnitsOfWork(n)) {
        values.push(...value);
      }
      return values;
    },
    flush(): Array<mixed> {
      return ReactNoop.flushUnitsOfWork(Infinity);
    },
    flushAndYield(
      unitsOfWork: number = Infinity,
    ): Generator<Array<mixed>, void, void> {
      return flushUnitsOfWork(unitsOfWork);
    },
    flushUnitsOfWork(n: number): Array<mixed> {
      let values = yieldedValues || [];
      yieldedValues = null;