Autocompletion and IIFE modules

I'm frequently using Immediately Invoked Function Expressions (IIFE) to define modules in my code of the form;

foo.js

module.exports = (function () {

     function foo(data) {
     }

     return {
          foo: foo
     }
}());

bar.js
var foo = require('./foo');


module.exports = (function () {
     function bar(data) {
          foo.foo(data)      <--- foo.foo marked as a ReferenceError
     }


     return {
          bar: bar
     }
}());



So the foo module is exporting the function foo, however, Webstorm does not properly resolve references to the function when I use it in other modules.  This has been a little frustrating as I really like this form of module defintion.  I've been searching to find a way to allow Webstorm to resolve these references, but have not had any luck.  Has someone else run into this who can help me.  Thanks.