foo.js

/*
File...: foo.js
Exports: bar, baz
Depends: spam, eggs
*/
;(function (namespace) {
 'use strict'

 namespace.foo = function (namespace) {
   /* Dependencies */
   var spam = namespace.spam
   var eggs = namespace.eggs

   function bar () {
   }

   function baz () {
   }

   /* Exports */
   namespace.bar = bar
   namespace.baz = baz
 }
}((function () {
  if (typeof window === 'undefined') {
    return module.exports
  } else {
    return window
  }
}())))