function Marker(tooltipContext) {
      _classCallCheck(this, Marker);
      this.w = tooltipContext.w;
      this.ttCtx = tooltipContext;
      this.ctx = tooltipContext.ctx;
      this.tooltipPosition = new Position(tooltipContext);
    }
ApexCharts Tooltip.Marker Class to draw texts on the tooltip.
This file deals with the markers that appear near tooltip in line/area charts.
These markers helps the user to associate the data-points and the values
that are shown in the tooltip

@module Tooltip.Marker