Handling events in root component

app.component.ts

export class MyApp {
  constructor(private platform : Platform) {
    this.platform.Ready().then(() =>
       this.handleEvents();
    )
  }
  handleEvents() {
    this.events.subscribe("navigation", (eventData)=> {
      this.nav.push(eventData.page, eventData.data)
    });
    this.events.subscribe("modalPopup", (eventData) => {
      this.nav.push(eventData.modal, eventData.data
    });
  }
}