code: function getContentWidth(allColumns, defaultColWidth) {
      if (defaultColWidth === void 0) { defaultColWidth = 300; }
      var contentWidth = 0;
      for (var _i = 0, allColumns_1 = allColumns; _i < allColumns_1.length; _i++) {
          var column = allColumns_1[_i];
          contentWidth += (column.width || defaultColWidth);
      }
      return contentWidth;
  }
docs: Gets the width of the columns