nested-forms/apps/global-form/src/app/app.component.ts

import { Component, OnDestroy, OnInit } from '@angular/core';
import { FormGroup } from '@angular/forms';
import {
  Contact,
  ContactService,
  ContactFormService,
} from '@nested-forms/contact';
import { Subscription } from 'rxjs';

@Component({
  selector: 'nested-forms-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent implements OnInit, OnDestroy {
  contact: Contact;
  form: FormGroup;

  private subscription: Subscription;

  constructor(
    private service: ContactService,
    private formService: ContactFormService,
  ) {}

  public ngOnInit() {
    this.subscription = this.service
      .loadContact()
      .subscribe((data: Contact) => {
        this.contact = data;
        this.form = this.formService.createForm(data);
      });
  }

  public ngOnDestroy() {
    if (this.subscription) {
      this.subscription.unsubscribe();
    }
  }
}