Windows: Support Hyperloop ES6

// ES5-style require call

var Int32 = require('System.Int32');

// ES6-style import

import Button from 'Windows.UI.Xaml.Controls.Button';

import PropertyValue from 'Windows.Foundation.PropertyValue';

import MessageDialog from 'Windows.UI.Popups.MessageDialog';

import UICommand from 'Windows.UI.Popups.UICommand';

let win = Ti.UI.createWindow({ backgroundColor: 'green' }),

	button = new Button();

button.Content = "PUSH";

button.addEventListener('Tapped', () => {

    const dialog = new MessageDialog('My Message');

    dialog.Title = 'My Title';

    dialog.DefaultCommandIndex = 0;

    dialog.Commands.Add(new UICommand('OK', null, PropertyValue.CreateInt32(0)));

    dialog.Commands.Add(new UICommand('Cancel', null, PropertyValue.CreateInt32(1)));

    dialog.ShowAsync().then(function (command) {

        const id = Int32.cast(command.Id);

        alert((id == 0) ? 'Pushed "OK"' : 'Pushed "Cancel"')

    });

});

win.add(button);

win.open();