Function performWorkOnRoot

code/new-context-api/public/app.js:13173–13218

(root, expirationTime, isAsync)

  }

  function performWorkOnRoot(root, expirationTime, isAsync) {
    !!isRendering ? invariant(false, 'performWorkOnRoot was called recursively. This error is likely caused by a bug in React. Please file an issue.') : void 0;

    isRendering = true;

    // Check if this is async work or sync/expired work.
    if (!isAsync) {
      // Flush sync work.
      var finishedWork = root.finishedWork;
      if (finishedWork !== null) {
        // This root is already complete. We can commit it.
        completeRoot(root, finishedWork, expirationTime);
      } else {
        root.finishedWork = null;
        finishedWork = renderRoot(root, expirationTime, false);
        if (finishedWork !== null) {
          // We've completed the root. Commit it.
          completeRoot(root, finishedWork, expirationTime);
        }
      }
    } else {
      // Flush async work.
      var _finishedWork = root.finishedWork;
      if (_finishedWork !== null) {
        // This root is already complete. We can commit it.
        completeRoot(root, _finishedWork, expirationTime);
      } else {
        root.finishedWork = null;
        _finishedWork = renderRoot(root, expirationTime, true);
        if (_finishedWork !== null) {
          // We've completed the root. Check the deadline one more time
          // before committing.
          if (!shouldYield()) {
            // Still time left. Commit the root.
            completeRoot(root, _finishedWork, expirationTime);
          } else {
            // There's no time left. Mark this root as complete. We'll come
            // back and commit it later.
            root.finishedWork = _finishedWork;
          }
        }
      }
    }

    isRendering = false;
  }

  function completeRoot(root, finishedWork, expirationTime) {
    // Check if there's a batch that matches this expiration time.