home.ts

import { Component } from '@angular/core';
import { NavController, Platform } from 'ionic-angular';

import { File } from '@ionic-native/file';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  items;
  savedParentNativeURLs = [];

  constructor(public navCtrl: NavController, public fileNavigator: File, public plt: Platform) {

    const ROOT_DIRECTORY = 'file:///';

    plt.ready()
      .then(() => {
        this.listDir(ROOT_DIRECTORY, '');
    })
  }
}