property 'forkJoin' does not exist on type 'typeof observable' - angular2

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I was looking to experiment with a forkJoin mainly using the accepted answer here:

Angular2 Observable.forkJoin of observable variables - ReferenceError: Observable is not defined

I'm getting the above error message as forkJoin isn't available.

Anyone know why?

Angular 6 changes this up a bit. forkJoin has been converted to a regular function so, instead of:

import {Observable} from 'rxjs/Observable';
...
return Observable.forkJoin(
    this.http.get('someurl'),
    this.http.get('someotherurl'));

Use:

import {forkJoin} from 'rxjs';
...
return forkJoin(
    this.http.get('someurl'),
    this.http.get('someotherurl'));

You can go to https://www.metaltoad.com/blog/angular-6-upgrading-api-calls-rxjs-6 for more explanation.

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Did you do this?

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/forkJoin';

You have to add methods individually.

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You just need to replace

import { Observable } from 'rxjs/Observable';

by

import { Observable } from 'rxjs/Rx';

and it will start working

Warning: Do not use this method as it will include the entire RxJs library (increasing kb bundle size)

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Check your version of Rxjs, if you are using Rxjs 6, use import { Observable } from 'rxjs/Observable'; import 'rxjs/add/observable/forkJoin'; won't work, use import { Observable, forkJoin } from 'rxjs' instead

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I have been running Angular version 5.2.0 and faced similar problem. So instead of calling observable with the following way

import { Observable } from 'rxjs/observable'

I imported Observable by including the entire RxJs library

import { Observable } from 'rxjs/Rx'

Then for the forkJoin, included the below import module

import 'rxjs/add/observable/forkJoin';

and code compiled successfully.

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Comments
  • Note that this is a static method, so as Dan wrote, you have to import 'rxjs/add/observable/forkJoin', and not import 'rxjs/add/operator/forkJoin'. Have been bitten by that twice...
  • @dan-cancro 's solution is better if you do not want to download the entire library.
  • Really, really don't import all of "rxjs/Rx", it's huge and most projects won't use more than a very small number of its exports.
  • this solution worked fine with Angular 4 for me, but I'm having issues with Angular 5 (in production build)
  • Warning: Do not use this method as it will include the entire RxJs library (increasing kb bundle size)