javascript - 类型 'filter' 上不存在属性 'Observable'

Question

您好，我正在使用带有路由器 3.0 的 Angular 2 final。我想过滤从 this.router.events 发出的事件

我想做什么:

import 'rxjs/operator/filter';

//...

this.router.events
  .filter((event:Event) => event instanceof NavigationEnd)
  .subscribe(x => console.log(x))

event可以是 instanceOf NavigationEnd , NavigationStart或 RoutesRecognized但我只想要 NavigationEnd .但是我得到一个错误

Property 'filter' does not exist on type Observable<Event>

在编译期间。

当我导入整个 rxjs库错误消失。我应该导入什么才能使其在不加载完整 rxjs 库的情况下工作？

Answer 1

更新

对于 RXJS 5.x 版本:

import 'rxjs/add/operator/filter';

对于 RXJS 6.x version :

从 'rxjs/operators' 导入 { filter };

The following rules have been designed by the RxJS team to help JavaScript developers refactor import paths:

1. rxjs/operators: Contains all pipeable operators.

import { map, filter, scan } from 'rxjs/operators';

2. rxjs: Contains creation methods, types, schedulers, and utilities.

import { Observable, Subject, asapScheduler, pipe, of, from,
interval, merge, fromEvent } from 'rxjs';