gantt-chart.component.ts

import 'dhtmlx-gantt';

// or more explicitly,
// import * as gantt from 'dhtmlx-gantt';

@Component({
    selector: "gantt-chart",
    template: "<div #gantt></div>",
    styleUrls: ['./styles.scss']
})
export class GanttChartComponent implements OnInit {
    @ViewChild("gantt") ganttContainer: ElementRef;

    ngOnInit(){
        gantt.init(this.ganttContainer.nativeElement);
    }
}