ng-route-guard-auth-service.ts

    @Injectable({
      providedIn: 'root'
    })
    export class AuthService {
      isLogin = false;
    
      roleAs: string;
    
      constructor() { }
    
      login(value: string) {
        this.isLogin = true;
        this.roleAs = value;
        localStorage.setItem('STATE', 'true');
        localStorage.setItem('ROLE', this.roleAs);
        return of({ success: this.isLogin, role: this.roleAs });
      }
    
      logout() {
        this.isLogin = false;
        this.roleAs = '';
        localStorage.setItem('STATE', 'false');
        localStorage.setItem('ROLE', '');
        return of({ success: this.isLogin, role: '' });
      }
    
      isLoggedIn() {
        const loggedIn = localStorage.getItem('STATE');
        if (loggedIn == 'true')
          this.isLogin = true;
        else
          this.isLogin = false;
        return this.isLogin;
      }
    
      getRole() {
        this.roleAs = localStorage.getItem('ROLE');
        return this.roleAs;
      }
    
    }