timeOut in ionic 2

Ionic Framework ionic-v3
5

there is a solution in the api docs:
http://ionicframework.com/docs/v2/api/components/alert/Alert/

search for “Dismissing And Async Navigation”

let alert = Alert.create({
  title: 'Hello',
  buttons: [{
    text: 'Ok',
    handler: () => {
      // user has clicked the alert button
      // begin the alert's dimiss transition
      let navTransition = alert.dismiss();

      // start some async method
      someAsyncOperation().then(() => {
        // once the async operation has completed
        // then run the next nav transition after the
        // first transition has finished animating out

        navTransition.then(() => {
          // here comes your navigation action (push, pop, setRoot)
          this.nav.setRoot(XXX);
        });
      });
      return false;
    }
  }]
});

this.nav.present(alert);