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

Question

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?

Answer 1

Did you do this?

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

You have to add methods individually.

Answer 2

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.