Property 'filter' does not exist on type 'Observable'

Question

Hi I am using Angular 2 final with router 3.0. I want to filter the events that are emitted from this.router.events

What I want to do :

Answer 1

After updating to Rxjs 6 with Angular 6 upgrade.

import { map, filter, scan } from 'rxjs/operators';

...
this.registrationForm.valueChanges
      .pipe(
        filter(() => this.registrationForm.valid),
        map((registrationForm: any) => {
          this.registrationVm.username = registrationForm.username;
          this.registrationVm.password = registrationForm.password;
          this.registrationVm.passwordConfirm = registrationForm.passwordConfirm;
        })
      )
      .subscribe();