catalog-ui/src/app/ng2/app.component.ts

import { Component, Inject } from '@angular/core';
import { AuthenticationService } from './services/authentication.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {

  constructor(auth:AuthenticationService){

  }

}