Why can't I import NavController and ViewController into Service or App?

Ionic Framework ionic-v3
13

Well i’m using @ViewChild and a variable in the html nav component to get it inside of the app.ts, idk if this is a good approach to the issue but maybe you could use it as well:

<ion-nav id="nav" #rootNavController [root]="rootPage" #content>
</ion-nav>

In app.ts:

import {ViewChild} from 'angular2/core';
@App({
  templateUrl: 'build/app.html'
})
class MyApp {
  @ViewChild('rootNavController') nav: NavController;
  ...
}
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