security and modularity in js apps

1.cshtml

@{var user = (CustomPrincipal)User;}

@if (user.Can("locations/manage"))
{
    @Html.LocationManagementScripts()
}

@if (user.Can("locations/search"))
{
    @Html.LocationSearchScripts()
}

2.js

myApp = new Backbone.Marionette.Application();

myApp.addInitializer(function(options){
  var myView = new MyView({
    model: options.someModel
  });
  MyApp.mainRegion.show(myView);
});

myApp.addInitializer(function(options){
  new MyRouter();
  new SomeOtherView().render();
});

myApp.start();

3.js

// --------------------
// app.js

myApp = new Backbone.Marionette.Application();

myApp.addRegions({
  mainRegion: "#main"
});


// --------------------
// locationSearch.js

(function(myApp, Backbone){
  var SearchView = Backbone.View.extend({
    // ...
  });

  myApp.addRegions({
    searchRegion: "#search"
  });

  myApp.addInitializer(function(){
    var view = new SearchView();
    view.render();
    myApp.searchRegion.show(view);
  });
})(myApp, Backbone);


// --------------------
// index.html

<script language="javascript">
  myApp.start();
</script>