Function flushRoot

code/communication/public/app.js:13811–13818

(root, expirationTime)

  }

  function flushRoot(root, expirationTime) {
    !!isRendering ? invariant(false, 'work.commit(): Cannot commit while already rendering. This likely means you attempted to commit from inside a lifecycle method.') : void 0;
    // Perform work on root as if the given expiration time is the current time.
    // This has the effect of synchronously flushing all work up to and
    // including the given time.
    performWorkOnRoot(root, expirationTime, false);
    finishRendering();
  }

  function finishRendering() {
    nestedUpdateCount = 0;