ng update 15

src/app/modules/songs/services/song-list.resolver.ts

@@ -1,5 +1,5 @@
 import {Injectable} from '@angular/core';
-import {Resolve} from '@angular/router';
+
 import {Observable} from 'rxjs';
 import {SongService} from './song.service';
 import {Song} from './song';
@@ -8,7 +8,7 @@ import {filter} from 'rxjs/operators';
 @Injectable({
   providedIn: 'root',
 })
-export class SongListResolver implements Resolve<Song[]> {
+export class SongListResolver {
   public constructor(private songService: SongService) {}
 
   public resolve(): Observable<Song[]> {