Javascript 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“this”
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RxJs pipe and lettable operator `map`: 'this' context of type 'void' is not assignable to method's 'this' of type 'Observable<{}>'
提问by Max Koretskyi
I have this very basic example that uses lettable operator mapwith pipefrom [email protected]:
我有一个使用可出租经营者这个非常简单的例子map有pipe来自[email protected]：
import { map } from 'rxjs/operator/map';
let o = of(1, 2, 3, 4).pipe(
map((v) => v * 2)
);
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?
但它产生错误Error:(34, 5) TS2684:The 'this' context of type 'void' is not assignable to method's 'this' of type 'Observable<{}>'.这里有什么问题？
回答by Max Koretskyi
Lettable instance operators should be imported from rxjs/operators:
可出租的实例运算符应从以下导入rxjs/operators：
import { map } from 'rxjs/operators';
As opposed to non-lettable equivalents which are imported from rxjs/operator:
与从以下进口的不可出租等价物相反 rxjs/operator：
import { map } from 'rxjs/operator/map';
To learn more about lettable operator read:
要了解有关可出租运算符的更多信息，请阅读：
