How to navigate between pages in Ionic 4

Ionic Framework ionic-v3
1

I trying to figure out how to navigate between pages in Ionic 4.In v3 the way is:

import { Component } from '@angular/core';
import { WelcomePage } from '../welcome/welcome';

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
})
export class HomePage {
  openWelcomePage() {
    this.navCtrl.push(WelcomePage);
  }
}

but in v4 is giving an error:
Screenshot_2019-01-25_15-57-12

2
3

look here a little
it helped me