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angular7报错，求解

：in src/app/content/content.component.ts(18,7): error TS2345: Argument of type ‘MonoTypeOperatorFunction’ is not assignable to parameter of type ‘OperatorFunction<Event, Event>’.

代码有错，修改为：

 constructor(public router:Router) {
    router.events.pipe(
      filter(event=>event instanceof NavigationEnd)
    ).subscribe((event:NavigationEnd)=>{
      if(event.url==='/dashboard'){
        this.pageTitle='这里是首页';
        this.pageDesc='';
      }else if(event.url.startsWith('/stock')){
        this.pageTitle='股票信息管理';
        this.pageDesc='进行股票信息基本增删改查';
      }
    });

另外自己导包的名称不同，一个大写，一个没有大写的问题。导致出现下面的报错
WARNING in ./node_modules/@angular/Router/fesm5/router.js
There are multiple modules with names that only differ in casing.
This can lead to unexpected behavior when compiling on a filesystem with other case-semantic.