Angular 2动态组件生成，ts编译报错

Question

我可以使用这个方法创建动态组件：

public addItem<T extends WidgetComponent>(ngItem: {new(): T}): T {
    let factory = this._componentFactoryResolver.resolveComponentFactory(ngItem);
    const ref = this._viewCntRef.createComponent(factory);
    const newItem: T = ref.instance as T;
    ...
    return newItem;
  }

然后这样称呼它：

const ref: MyWidgetComponent = this.dashboard.addItem<MyWidgetComponent>(MyWidgetComponent);

但是 typescript 给我这个编译错误： app.component.ts:45:35 Untyped function calls may not accept type arguments.

我尝试用Type<T> 替换{new(): T}，但我有同样的错误：app.component.ts:45:35 Untyped function calls may not accept type arguments.

这里的正确定义是什么？因为代码很好用……

编辑：这里是完整的代码，如果你想看到它https://github.com/jaumard/ng2-dashboard/blob/master/components/dashboard/dashboard.component.ts#L99

Answer 1

我设法通过将签名更改为来修复编译错误：

public addItem(ngItem: Type<WidgetComponent>): WidgetComponent

还有这样的电话：

const ref: MyWidgetComponent = this.dashboard.addItem(MyWidgetComponent) as MyWidgetComponent;