问@types/arcgis-js-api in angular 5应用程序

EN

  import { Component, OnInit, Input, ViewChild, ElementRef } from 
'@angular/core';
  import * as esriLoader from 'esri-loader';
  import { environment } from '../../../environments/environment';
  import Esri = __esri;

  @Component({
    selector: 'app-custom-widget',
    templateUrl: './custom-widget.component.html',
    styleUrls: ['./custom-widget.component.css']
  })
  export class CustomWidgetComponent implements OnInit {
    private _mapView: Esri.MapView;
    private _scriptOptions: any;

    @ViewChild('customWidget') widgetElement: ElementRef;
    @Input()
    set mapView(mapView: Esri.MapView) {
      if (!mapView) {
        return;
      }
      this._mapView = mapView;
      this.renderWidget();
    }
    get mapView(): Esri.MapView {
      return this._mapView;
    }

    constructor() {
      this._scriptOptions = {
        url: environment.arcgisAPIVersion
      };
    }

    ngOnInit() {

    }

    renderWidget(): void {
      esriLoader.loadModules([
        'esri/widgets/Widget'
      ], this._scriptOptions).then(([Widget]) => {
        const widgetProperties: Esri.WidgetProperties = {
          container: this.widgetElement.nativeElement
        };

        const widget: Esri.Widget = new Widget(widgetProperties);

        this._mapView.ui.add(widget, 'bottom-right');
      });
    }

  }