Module not available when using Require with Marionette modules

Question

I am currently developing a web app for a term paper. I only used Angular before but decided that Backbone is definitely worth being given a try. I do, however, have trouble getting the basic skeleton with Require.js running. My code fails when I try to access a Marionette module I required before. Here are the relevant sections of the code:

main.coffee

require.config
   # ...

require ["app"], (mod86) ->
    mod86.start()

app.coffee

define ["backbone", "marionette", "marionette.handlebars"], (Backbone, Marionette) ->
    mod86 = new Backbone.Marionette.Application()
    mod86.addRegions
        mainRegion: "#main"
    mod86.on "initialize:after", ->
        require ["index/index"], ->
            mod86.mainRegion.show(mod86.Index.Index)
            # This is where my code fails, because mod86.Index === undefined
    return mod86

index/index.coffee

require ["app", "hbs!/templates/index/index"], (mod86, indexTpl) ->
    mod86.module "Index", (Index, mod86, Backbone, Marionette, $, _) ->
        Index.Index = Marionette.ItemView.extend
            template:
                type: "handlebars"
                template: indexTpl
            serializeData: -> {}

I'm currently reading David Sulc's book on the topic and I thought I followed along pretty closely, I'm really not king anything fancy yet. To me it seems weird to only register the template after the initialization is through, but that's what he did as well to avoid circular dependency. I also tried some different configurations, they always resulted in the same error. I could probably drop the Marionette module system altogether and use only Require, but I feel that's not the way to go.
Any advice would be gladly appreciated!

EDIT:

Adding some console.logs reveals that the module seems to be created only after I try to access it in my function. After a quick look at the Marionette source I wouldn't know why that should be the case, though.

Answer 1

Alright, I figured it out. In index/index.coffee I need a define instead of require. Appearantly RequireJS doesn't see anything in a require as eligible as the wanted dependancy, so doesn't execute the callback. After the callback in app.coffee is through, however, there is a new loaded file that has a require statement, which is executed then.
So the solution is to always use define when you require a file, even though you don't return anything at all.