How to use the britecharts/dist/umd/bullet.min function in britecharts

private initializeChart() {
    switch (this.chartType) {
      case ChartType.Bar:
        this.chart = bar();
        this.chartSelector = '.bar-chart';
        this.chartClickSelector = '.bar-chart .bar';
        this.tooltipContainerSelector = '.bar-chart .metadata-group';
        break;
      case ChartType.Brush:
        this.chart = brush();
        this.chartSelector = '.brush-chart';
        this.chartClickSelector = ''; // No click selector.
        this.tooltipContainerSelector = ''; // No tooltip selector.
        break;
      case ChartType.Bullet:
        this.chart = bullet();
        this.chartSelector = '.bullet-chart';
        this.chartClickSelector = '.bullet-chart .range, .bullet-chart .measure, .bullet-chart .marker-line';
        this.tooltipContainerSelector = ''; // No tooltip selector.
        break;
      case ChartType.Donut:
        this.chart = donut();
        this.chartSelector = '.donut-chart';
        this.chartClickSelector = '.donut-chart .arc';
        this.tooltipContainerSelector = ''; // No tooltip selector.
        break;
      case ChartType.GroupedBar:
        this.chart = groupedBar();
        this.chartSelector = '.grouped-bar';
        this.chartClickSelector = '.grouped-bar .bar';
        this.tooltipContainerSelector = '.grouped-bar .metadata-group';
        break;

ChartComponent.prototype.initializeChart = function () {
        switch (this.chartType) {
            case ChartType.Bar:
                this.chart = bar();
                this.chartSelector = '.bar-chart';
                this.chartClickSelector = '.bar-chart .bar';
                this.tooltipContainerSelector = '.bar-chart .metadata-group';
                break;
            case ChartType.Brush:
                this.chart = brush();
                this.chartSelector = '.brush-chart';
                this.chartClickSelector = ''; // No click selector.
                this.tooltipContainerSelector = ''; // No tooltip selector.
                break;
            case ChartType.Bullet:
                this.chart = bullet();
                this.chartSelector = '.bullet-chart';
                this.chartClickSelector = '.bullet-chart .range, .bullet-chart .measure, .bullet-chart .marker-line';
                this.tooltipContainerSelector = ''; // No tooltip selector.
                break;
            case ChartType.Donut:
                this.chart = donut();
                this.chartSelector = '.donut-chart';
                this.chartClickSelector = '.donut-chart .arc';
                this.tooltipContainerSelector = ''; // No tooltip selector.
                break;
            case ChartType.GroupedBar:
                this.chart = groupedBar();
                this.chartSelector = '.grouped-bar';
                this.chartClickSelector = '.grouped-bar .bar';
                this.tooltipContainerSelector = '.grouped-bar .metadata-group';
                break;