logIn(username: string, password: string): any {
    return this.http.post<User>(this.API.LOGIN, { username, password });
  }

LogIn: Observable<any> = this.actions
    .ofType<any>(AuthActionTypes.LOGIN)
    .map((action: LogIn) => action.payload)
    .exhaustMap(payload => {
      return this.authService.logIn(payload.username, payload.password).pipe(
        map(user => {
          return new LogInSuccess({
            username: user,
          });
        }),
        catchError(error => console.log(error)),
      );
    });