使用推荐的操作符导入调用 RxJS 共享时遇到问题 [英] Having trouble calling RxJS share using the recommended operator import
问题描述
我正在尝试了解导入 rxjs 运算符的最佳实践
I'm trying to understand the best practice for importing rxjs operators
似乎我应该以这种方式导入 share，但是，以下内容不起作用，因为它说 share 需要 0 个参数.我不太确定如何正确调用 share.
It seems like I should import share this way, but, the following doesn't work because it says share expects 0 arguments. I'm not quite sure how to call share correctly.
import { share } from 'rxjs/operators';
...
public currentUser: Observable<User> = share(this.currentUser$.asObservable());
以旧方式进行操作不会造成任何问题.但是我似乎读过这不是导入 https://www.learnrxjs 的首选方式.io/concepts/operator-imports.html
Doing it the old way causes no problems. However I seemed to have read that's not the preferred way to import https://www.learnrxjs.io/concepts/operator-imports.html
import 'rxjs/add/operator/share';
...
public currentUser: Observable<User> = this.currentUser$.asObservable().share();
如果我使用推荐的导入方式，我应该如何调用 share ?
How should I call share if I'm using the recommended way of importing?
推荐答案
使用 share 就像任何其他自 RxJS 5.5 以来的pipable"操作符一样:
Using share is like any other "pipable" operator since RxJS 5.5:
import { share } from 'rxjs/operators';
...
this.currentUser$.pipe(share());
有关 pipable 运算符的更多详细信息，请参阅:https:///github.com/ReactiveX/rxjs/blob/master/doc/pipeable-operators.md
For more details about pipable operators see: https://github.com/ReactiveX/rxjs/blob/master/doc/pipeable-operators.md
但是请注意，从 rxjs/operators 导入会导入整个文件 https://github.com/ReactiveX/rxjs/blob/master/src/operators/index.ts.
这意味着如果您自己捆绑应用，它的大小可能会显着增加.
However be aware that importing from rxjs/operators imports this entire file https://github.com/ReactiveX/rxjs/blob/master/src/operators/index.ts.
This means that if you bundle your app yourself it might grow in size significantly.
因此，您可能希望从其自己的文件中导入每个运算符，例如:
So you might want to import each operator from it's own file like:
import { share } from 'rxjs/internal/operators/share';
...然后以同样的方式使用它.
... and then use it the same way.
这并不总是必要的.如果您使用的是像 angular-cli 这样的预配置构建系统，它会为您进行路径映射，因此您无需担心它并始终使用 rxjs/operators.您可以阅读有关此内容的更多信息:
This isn't always necessary. If you're using a preconfigured build system like angular-cli it does path mappings for you so you don't need to worry about it and always use rxjs/operators. You can read more about this:
https://github.com/ReactiveX/rxjs/blob/master/doc/pipeable-operators.md#build-and-treeshaking
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