Mock Google 带有打字稿定义的地图对象

Mock Google Maps object with typescript definitions

我有一个 Angular 组件依赖于 google.maps.Map class。看起来像这样:

export class MapViewComponent implements OnInit {

    @Input()
    public mapOptions: google.maps.MapOptions;

    public map: google.maps.Map;

    @ViewChild("map", { static: true })
    mapDomNode: ElementRef;

    public ngOnInit() {
        this.map = new google.maps.Map(this.mapDomNode.nativeElement, this.mapOptions);
    }
}

我根据 docs:

安装了 Google 地图类型定义
npm i -D @types/google.maps

现在我需要为我的组件创建单元测试并尝试使用以下方法SO answer(我使用 Karma 进行测试):

window['google'] = {
    maps: {
        Map: () => ({})
    }
};
const spy = spyOn(window['google']['maps'], 'Maps').and.returnValue({});

我收到错误:

Type '() => {}' is not assignable to type 'typeof Map'.
  Type '() => {}' provides no match for the signature 'new (mapDiv: Element, opts?: MapOptions): Map'.ts(2322)
index.d.ts(3223, 9): The expected type comes from property 'Map' which is declared here on type 'typeof maps'

我尝试使用不同的变体,例如 Map: () => { return {} as google.maps.Map } 和许多其他东西,但 TypeScript 总是显示类型错误。

如何使用任何对象而不是 google.maps.Map 类型。

尝试像这样投射 {}

const spy = spyOn(window['google']['maps'], 'Maps').and.returnValue({} as Map);

如果这不起作用,您可以使用 any:

const spy = spyOn(window['google']['maps'], 'Maps').and.returnValue({} as any);

编辑 尝试:

window['google'] = {
    maps: {
        Map: () => ({}) as any,
    }
};

我设法通过将 any 添加到模拟对象的末尾来修复它:

googleMaps = jasmine.createSpyObj('Maps', ['setCenter', 'setZoom', 'setOptions']);

function Map() {
    return googleMaps;
}

window['google'] = {
    maps: {
        Map: Map,
        ...
    }
} as any; // <---