forkJoin is deprecated: resultSelector is deprecated, pipe to map instead

Question

I'm working on an Angular 6 project.

Running ng lint gives the following Warning:

"forkJoin is deprecated: resultSelector is deprecated, pipe to map instead"

 forkJoin(...observables).subscribe(

Any idea? Can't seem to find any information about this deprecation.

I just generated a brand new Angular application "ng new forkApp" with Angular CLI: 6.1.5

source:

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { forkJoin } from 'rxjs';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  title = 'forkApp';

  constructor(private http: HttpClient) {}

  ngOnInit() {
    console.log('ngOnInit...');

    const obs = [];
    for (let i = 1; i < 4; i++) {

      const ob = this.http.get('https://swapi.co/api/people/' + i);
      obs.push(ob);

    }

    forkJoin(...obs)
      .subscribe(
        datas => {
          console.log('received data', datas);
        }
      );

  }
}

"dependencies" section from package.json file:

  "dependencies": {
    "@angular/animations": "^6.1.0",
    "@angular/common": "^6.1.0",
    "@angular/compiler": "^6.1.0",
    "@angular/core": "^6.1.0",
    "@angular/forms": "^6.1.0",
    "@angular/http": "^6.1.0",
    "@angular/platform-browser": "^6.1.0",
    "@angular/platform-browser-dynamic": "^6.1.0",
    "@angular/router": "^6.1.0",
    "core-js": "^2.5.4",
    "rxjs": "^6.0.0",
    "zone.js": "~0.8.26"
  },

Once all three GET requests are done I got all data in "datas" array. The issue is that once I run: ng lint I got this:

C:\forkApp>ng lint

WARNING: C:/forkApp/src/app/app.component.ts[26, 5]: forkJoin is deprecated: resultSelector is deprecated, pipe to map instead

Answer 1

I was able to fix this by getting rid of the ellipsis:

forkJoin(observables).subscribe();

As long as observables is already an array, it should have the same result.