propertybindingissue.ts

@Component({
  selector: 'parent',
  template: `
    <span>{{ name }}</span>
    <child [text]="text"></child>
  `
})
export class ParentComponent {  
  ...
}
export class ChildComponent implements OnInit {  
  @Input() text;
  constructor(private parent: ParentComponent) {}
  ngOnInit() {
    this.parent.name = 'updated name';
  }
}