如何在没有订阅者的情况下保持shareReplay的存活？

import { Observable } from 'rxjs';
import { shareReplay, publish, refCount } from 'rxjs/operators';

// 创建一个可连接的Observable
const source$ = new Observable(observer => {
  console.log('Observable created');
  observer.next('Hello');
  observer.next('World');
  return () => {
    console.log('Observable destroyed');
  };
});

// 使用shareReplay保持存活
const shared$ = source$.pipe(
  shareReplay({
    bufferSize: 1,
    refCount: true
  })
);

// 使用refCount操作符管理订阅者数量
const refCounted$ = shared$.pipe(refCount());

// 订阅者1
const subscription1 = refCounted$.subscribe(value => {
  console.log('Subscriber 1:', value);
});

// 订阅者2
const subscription2 = refCounted$.subscribe(value => {
  console.log('Subscriber 2:', value);
});

// 取消订阅者1的订阅
subscription1.unsubscribe();

// 取消订阅者2的订阅
subscription2.unsubscribe();