问题描述
如何在RxJS 5.5中使用 pipe()
而不是链接运算符的新推荐方法,使用 multicast()
运算符?当我像以前一样尝试使用 connect()
时,出现TypeScript错误:
How do I use the multicast()
operator with the new recommended approach in RxJS 5.5 of using pipe()
instead of chaining operators? I get a TypeScript error when I try to use connect()
like I did before:
const even$ = new Subject();
const connectedSub = interval(500)
.pipe(
filter(count => count % 2 === 0),
take(5),
multicast(even$)
)
.connect();
even$.subscribe(value => console.log(value));
此代码有效,但会产生TypeScript错误,该错误报告类型'Observable< {}>'上的属性'connect'不存在.
我是否以应有的方式使用可连接的可观察对象在RxJS 5.5及更高版本中?
This code works but yields a TypeScript error that reports that Property 'connect' does not exist on type 'Observable<{}>'.
Am I using connectable observables the way that I should be in RxJS 5.5+?
推荐答案
当前-v5.5.10和v6.1.0- pipe
的类型不知道 Observable
子类,因此我使用类型断言,如下所示:
The current - v5.5.10 and v6.1.0 - typings for pipe
are not aware of the Observable
subclasses, so I use a type assertion, like this:
const connectedObs = interval(500).pipe(
filter(count => count % 2 === 0),
take(5),
multicast(even$)
) as ConnectableObservable<number>;
const connectedSub = connectedObs.connect();
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