Angular 6中的Observable <string>类型中不存在属性'publish'

Question

我正在写我的第一个Angular申请表Angular 6.

我正在实现错误处理来处理单个地方的所有错误,为此,我正在遵循此媒体指南

根据stackblitz上的指南代码示例,我的NotificationService就像

import {Injectable} from '@angular/core';
import {BehaviorSubject, Observable} from 'rxjs';

import {publish} from 'rxjs/operators';

@Injectable()
export class NotificationService {
  private _notification: BehaviorSubject<string> = new BehaviorSubject(null);
  readonly notification$: Observable<string> = this._notification.asObservable().publish().refCount();

  constructor() {}

  notify(message) {
    this._notification.next(message);
    setTimeout(() => this._notification.next(null), 5000);
  }
}

IDE正在给出错误 publish()

我甚publish至从rxjs/operators导入但导入显示未使用.我也尝试了导入示例中的导入,但仍然得到相同的错误.

Answer 1

该publish功能不再存在Observable,您需要将它与管道一起使用,如下所示:

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

//...

private _notification: BehaviorSubject<string> = new BehaviorSubject(null);
readonly notification$: Observable<string> = this._notification.asObservable().pipe(
      publish(),
      refCount()
)