Remove unnecessary assignment (dependency injection handles this)

src/app/app.component.ts

@@ -9,9 +9,7 @@ import { WebSocketService } from './websocket.service';
 export class AppComponent implements OnInit {
   title = 'app';
 
-  constructor(private webSocketService: WebSocketService) {
-    this.webSocketService = webSocketService;
-  }
+  constructor(private webSocketService: WebSocketService) {}
 
   ngOnInit() {
     this.webSocketService.connect();