export const USER = {
   'name':"pepe",
   'surname': "Martin",
}

public user: User;
  constructor(private userService: UserService) { }
    ngOnInit(): void {
        this.userService.me().subscribe((user: User) => {
          this.user = user;
        });
      }

import { USER } from './constants.ts';

public me(): Observable<User> {
    return Observable.of(USER);