@Component({
  template: `
    <input (keydown.enter)="onEnter($event)">
    <my-component (data)="onData($event)"></my-component>
  `
})
export class AppComponent {
  emoji: string;

  onEnter() {
    this.emoji = '😜';
  }

  onData($event) {
    this.emoji = $event.emoji;
  }
}