code: function handleMouseOver(e, d, barList, chartWidth, chartHeight) {
              dispatcher.call('customMouseOver', e, d, d3Selection.mouse(e), [chartWidth, chartHeight]);
              highlightBarFunction = highlightBarFunction || function() {};
  
              if (hasSingleBarHighlight) {
                  highlightBarFunction(d3Selection.select(e));
                  return;
              }
  
              barList.forEach(barRect => {
                  if (barRect === e) {
                      return;
                  }
                  highlightBarFunction(d3Selection.select(barRect));
              });
          }
docs: Custom OnMouseOver event handler
  @return {void}
  @private