static get pluginName () {
    return 'heatmap'
  }
@typedef {{
  lineWidth?: number,
  dpi?: number,
  alpha?: number,
  gradient?: Array<number>,
  gradientColors?: Array<{ start: number, color:number }>,
  strokeStyle?: string,
  fillColor?: string,
  height?: number,
  data?: Array<number>,
  maxValue?: number,
  minValue?: number,
  maxLength?: number,
  mode?: string,
  [propName: string]: any
}} IHeatMapConfig