import { Component , OnInit } from '@angular/core' ; import { FormGroup } from '@angular/forms' ; import { environment } from '@env/environment' ; import { AuthenticationService } from '@app/core' ; @ Component ( { selector : 'app-login' , templateUrl : './login.component.html' , styleUrls : [ './login.component.scss' ] } ) export class LoginComponent implements OnInit { version : string = environment . version ; errorString : string ; loginForm : FormGroup ; isLoading = false ; constructor ( public authenticationService ) { } ngOnInit ( ) { } }