相关疑难解决方法(0)

尝试解决此代码的问题，

import { Event, Router, RoutesRecognized, ActivationStart, NavigationEnd } from "@angular/router";

...

this._router.events.pipe(
    filter((evt: Event) => evt instanceof RoutesRecognized),
    map((evt: RoutesRecognized) => evt.state.root),
).subscribe((rootRoute: ActivatedRouteSnapshot) => (
    this._resolvedRoutes = this._getResolvedRoutes(rootRoute.children)
));

哪个产生了这个错误，

ERROR: projects/acme/angular-ui/src/lib/services/breadcrumb/breadcrumb.service.ts:213:11 - error TS2345: Argument of type 'MonoTypeOperatorFunction<Event>' is not assignable to parameter of type 'OperatorFunction<Event, Event>'.
  Types of parameters 'source' and 'source' are incompatible.

这里到底有什么问题呢？我猜测该MonoTypeOperatorFunction<Event>函数是过滤器，但我不知道为什么OperatorFunction<Event, Event>映射中会有两个类型变量？我该如何解决这个问题？