I've Angular project where I'm trying to integrate amCharts. I've html page which looks like:

```
<div class="col-md-12">
        <div id="chartdiv" style="width: 100%; height: 500px"></div>
</div>

```

and Component which I copied from documentation but for some reason it does not work:

```
import { Component, NgZone } from "@angular/core";
import * as am4core from "@amcharts/amcharts4/core";
import * as am4charts from "@amcharts/amcharts4/charts";
import am4themes_animated from "@amcharts/amcharts4/themes/animated";

am4core.useTheme(am4themes_animated);

@Component({
    selector: 'page',
    styleUrls: ['./page.scss'],
    templateUrl: './page.html'
})
export class PageComponent {
    private chart: am4charts.XYChart;

    constructor(private service: PageService,private zone: NgZone) {
    }

    ngAfterViewInit() {
        this.zone.runOutsideAngular(() => {
            let chart = am4core.create("chartdiv", am4charts.XYChart);

            chart.paddingRight = 20;

            let data = [];
            let visits = 10;
            for (let i = 1; i < 366; i++) {
                visits += Math.round((Math.random() < 0.5 ? 1 : -1) * Math.random() * 10);
                data.push({ date: new Date(2018, 0, i), name: "name" + i, value: visits });
            }

            chart.data = data;

            let dateAxis = chart.xAxes.push(new am4charts.DateAxis());
            dateAxis.renderer.grid.template.location = 0;

            let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
            valueAxis.tooltip.disabled = true;
            valueAxis.renderer.minWidth = 35;

            let series = chart.series.push(new am4charts.LineSeries());
            series.dataFields.dateX = "date";
            series.dataFields.valueY = "value";

            series.tooltipText = "{valueY.value}";
            chart.cursor = new am4charts.XYCursor();

            let scrollbarX = new am4charts.XYChartScrollbar();
            scrollbarX.series.push(series);
            chart.scrollbarX = scrollbarX;

            this.chart = chart;
        });
    }

    ngOnDestroy() {
        this.zone.runOutsideAngular(() => {
            if (this.chart) {
                this.chart.dispose();
            }
        });
    }

}

```

But I'm still getting error `EXCEPTION: Uncaught (in promise): TypeError: {} is not a constructor
TypeError: {} is not a constructor`. `Unhandled Promise rejection: {} is not a constructor ; Zone: angular ; Task: Promise.then ; Value: TypeError: {} is not a constructor`. I've tried to debug it and error is caused when I use am4core. As I said I've copied the code from documentation, but it still not working.