docs: function(child, toIndex, lastIndex) {
        // If the index of `child` is less than `lastIndex`, then it needs to
        // be moved. Otherwise, we do not need to move it because a child will be
        // inserted or moved before `child`.
        if (child._mountIndex < lastIndex) {
          enqueueMove(this._rootNodeID, child._mountIndex, toIndex);
        }
      }