main.js

// original AMD version
define([
  'views/MapView',
  'views/LocatorView'
], function(
  MapView, LocatorView
) {
  var node = document.getElementById('map-area');
  var node2 = document.getElementById('locator-area');
  var mapView = new MapView(null, node);
  var locatorView = new LocatorView(null, node2);
});

// ES6 syntax
import MapView from 'views/MapView';
import LocatorView from 'views/LocatorView';

var node = document.getElementById('map-area');
var node2 = document.getElementById('locator-area');
var mapView = new MapView(null, node);
var locatorView = new LocatorView(null, node2);