如何在angular 7中的模块之间以安全的方式共享数据？

import { BehaviorSubject } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class SharedService {
  private sharedData = new BehaviorSubject<any>(null);
  sharedData$ = this.sharedData.asObservable();

  constructor() { }

  updateSharedData(data: any) {
    this.sharedData.next(data);
  }
}

import { SharedService } from 'path-to-shared-service/shared.service';

@Component({
  selector: 'app-my-component',
  template: '...',
  styleUrls: ['...']
})
export class MyComponent {
  sharedData: any;

  constructor(private sharedService: SharedService) { }

  ngOnInit() {
    this.sharedService.sharedData$.subscribe(data => {
      this.sharedData = data;
    });
  }
}

import { SharedService } from 'path-to-shared-service/shared.service';

@Component({
  selector: 'app-another-component',
  template: '...',
  styleUrls: ['...']
})
export class AnotherComponent {
  constructor(private sharedService: SharedService) { }

  updateData() {
    const newData = 'new data';
    this.sharedService.updateSharedData(newData);
  }
}