类型“typeof Observable"上不存在属性“from"，角度为 6? [英] Property 'from' does not exist on type 'typeof Observable', angular 6?

问题描述

我将 angular 5.2.10 项目更新为 angular 6.
我一步一步https://update.angular.io/，一切正常，除非Observable.from
在一个服务中，我使用了 Observable.from(this.user) 如下:

I updated my angular 5.2.10 project to angular 6.
I did step by step https://update.angular.io/, everything is OK unless Observable.from
In a service I used Observable.from(this.user) as following:

import { Observable } from 'rxjs/Observable';
...
Observable.from(this.users)// this.users is an array

没问题，但在 angular 6 中出现以下错误

It was OK, but in angular 6 the following error occurred

Property 'from' does not exist on type 'typeof Observable'

我改成如下

import { Observable, from } from 'rxjs';

但是没有变化，错误又发生了！

But no change and error occurred again!

推荐答案

在 rxjs@6 中，您可以使用 from 作为独立函数:

In rxjs@6 you can use from as standalone function:

import { from } from 'rxjs';
...

from(this.users);

或

import { from as observableFrom } from 'rxjs';
...

observableFrom(this.users);

另见迁移到 rxjs6 指南

See also migration to rxjs6 guide

• https://github.com/ReactiveX/rxjs/blob/master/MIGRATION.md#import-paths

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