docs: function _align(headRowData, startColIndex, endColIndex, alignDirection) {
    util.range(startColIndex, endColIndex + 1).forEach(colIndex => {
      const headCellData = headRowData[colIndex];
  
      if (util.isExisty(headCellData.colMergeWith)) {
        headRowData[headCellData.colMergeWith].align = alignDirection;
      } else {
        headCellData.align = alignDirection;
      }
    });
  }