Angular, form value change observer

form.component.ts

import { Component } from '@angular/core';
import { FormBuilder, FormGroup } from '@angular/forms';

@Component({
    selector: 'form',
    templateUrl: `
      <form [formGroup]="form">
        <input type="text" formControlName="name">
      </form>
    `,
    styleUrls: ['./form.component.scss']
})
export class FormComponent {

  form: FormGroup;

  construct(private fb:FormBuilder){
    this.formChangeObserver();
  }

  private formChangeObserver() {
    this.form.valueChanges
        .subscribe(data => {
            console.log('form changed ...');
        });  
  }

  private initForm() {
    this.form = this.fb.group({
      name: ['',[]]
    });
  }

}