code: function($super) {
              $super();
              this.showLines = true;
              $.extend(true, this.hcConfig, {
                  chart: {
                      type: 'area'
                  },
                  plotOptions: {
                      area: {
                          fillOpacity: this.focusedElementOpacity
                      }
                  }
              });
          }
docs: override