RxJs管道和lettable运算符`map`：'this'类型的'this'上下文不能分配给'Observable< {}>'类型的方法'this' [英] RxJs pipe and lettable operator `map`: 'this' context of type 'void' is not assignable to method's 'this' of type 'Observable<{}>'

问题描述

我有一个非常基本的例子，它使用来自 rxjs的带有 map 和 pipe 的lettable operator map @ 5.5 ：

I have this very basic example that uses lettable operator map with pipe from rxjs@5.5:

import { map } from 'rxjs/operator/map';

let o = of(1, 2, 3, 4).pipe(
    map((v) => v * 2)
);

但它产生错误错误：（34,5）TS2684：The 'this'类型的'this'上下文不能分配给'Observable< {}>'类型的方法'this'。这里有什么问题？

But it produces the error Error:(34, 5) TS2684:The 'this' context of type 'void' is not assignable to method's 'this' of type 'Observable<{}>'. What's the problem here?

推荐答案

可以从 rxjs /运算符导入Lettable实例运算符：

Lettable instance operators should be imported from rxjs/operators:

import { map } from 'rxjs/operators';

与从 rxjs / operator <导入的非可出租等价物相反/ code>：

As opposed to non-lettable equivalents which are imported from rxjs/operator:

import { map } from 'rxjs/operator/map';

要了解有关lettable operator的更多信息，请阅读：

To learn more about lettable operator read:

• RxJS：了解Lettable Operators

• RxJS: Understanding Lettable Operators

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