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.
},
    
    dumpTree(rootID: string = DEFAULT_ROOT_ID) {
      const root = roots.get(rootID);
      const rootContainer = rootContainers.get(rootID);
      if (!root || !rootContainer) {
        console.log('Nothing rendered yet.');
        return;
      }
      let bufferedLog = [];
      function log(...args) {
        bufferedLog.push(...args, '\n');
      }
      function logHostInstances(
        children: Array<Instance | TextInstance>,
        depth,
      ) {
        for (let i = 0; i < children.length; i++) {
          const child = children[i];
          const indent = '  '.repeat(depth);
          if (typeof child.text === 'string') {
            log(indent + '- ' + child.text);
          } else {
            
            log(indent + '- ' + child.type + '#' + child.id);
            
            logHostInstances(child.children, depth + 1);
          }
        }
      }