data.guard.ts

@Injectable({
  providedIn: 'root',
})
export class DataGuard implements CanActivate {
  constructor(private store: Store<CustomerAppState>) {}

  canActivate(): Observable<boolean> {
    this.store.dispatch(CustomerActions.get());
    return this.store
      .select(fromCustomer.isLoaded)
      .pipe(filter((isLoaded) => isLoaded));
  }
}