privated methods in coffeescript

another_class.coffee

class AnotherClass
  constructor: ->
    console.warn("YEAH !")
    
exports.AnotherClass = AnotherClass

my_class.coffee

#= require another_class
AnotherClass = exports.AnotherClass

myPrivateMethod = ->
  console.warn("This:", @)
  
class MyClass
  init: (name)->
    console.warn("In my class")
    @name = name
    @a_friend = new AnotherClass
    myPrivateMethod.apply(this)

exports.MyClass = MyClass

my_lib.js

//= require wrap-start
//= require my_class
//= require another_class
//= require wrap-end

wrap-end.js

});

wrap-start.js

(function() {
  var exports = {};