How to use the react-reconciler/inline.fire.updateContainer function in react-reconciler

}
    // Initial mount should not be batched.
    unbatchedUpdates(() => {
      updateContainer(children, fiberRoot, parentComponent, callback);
    });
  } else {
    fiberRoot = root._internalRoot;
    if (typeof callback === 'function') {
      const originalCallback = callback;
      callback = function() {
        const instance = getPublicRootInstance(fiberRoot);
        originalCallback.call(instance);
      };
    }
    // Update
    updateContainer(children, fiberRoot, parentComponent, callback);
  }
  return getPublicRootInstance(fiberRoot);
}

unbatchedUpdates(() => {
      updateContainer(children, fiberRoot, parentComponent, callback);
    });
  } else {

ReactRoot.prototype.unmount = ReactSyncRoot.prototype.unmount = function(
  callback: ?() => mixed,
): Work {
  const root = this._internalRoot;
  const work = new ReactWork();
  callback = callback === undefined ? null : callback;
  if (__DEV__) {
    warnOnInvalidCallback(callback, 'render');
  }
  if (callback !== null) {
    work.then(callback);
  }
  updateContainer(null, root, null, work._onCommit);
  return work;
};

ReactRoot.prototype.render = ReactSyncRoot.prototype.render = function(
  children: ReactNodeList,
  callback: ?() => mixed,
): Work {
  const root = this._internalRoot;
  const work = new ReactWork();
  callback = callback === undefined ? null : callback;
  if (__DEV__) {
    warnOnInvalidCallback(callback, 'render');
  }
  if (callback !== null) {
    work.then(callback);
  }
  updateContainer(children, root, null, work._onCommit);
  return work;
};