RxJs 管道和可出租运算符“map":“void"类型的“this"上下文不可分配给“Observable<{}>"类型的方法的“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@5.5 的可出租运算符 map 和 pipe:

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)
);

但它会产生错误 Error:(34, 5) TS2684:The 'this' context of type 'void' 不可分配给类型为 'Observable<{}>' 的方法的 '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

Lettable 实例操作符应该从 rxjs/operators 导入:

Lettable instance operators should be imported from rxjs/operators:

import { map } from 'rxjs/operators';

与从 rxjs/operator 导入的不可出租等价物相反:

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

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

要了解有关可出租运算符的更多信息，请阅读:

To learn more about lettable operator read:

• RxJS:了解可出租运算符

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