Function finishSyncRender

docs/external/js/react-dom.development.js:21939–21943

(root)

  }

  function finishSyncRender(root) {
    // Set this to null to indicate there's no in-progress render.
    workInProgressRoot = null;
    commitRoot(root);
  }
  function flushDiscreteUpdates() {
    // TODO: Should be able to flush inside batchedUpdates, but not inside `act`.
    // However, `act` uses `batchedUpdates`, so there's no way to distinguish