Export private class to external object.

Export Class

/*
 * Base class
 */

(function() {

  var root = this;
  var previousBase = root.Base || {};
  
  var foo = 1;
  
  var Base = root.Base = {

    version: foo,

    noConflict: function() {
      root.Base = previousBase;
      return Base;
    }
  };

})();

/** 
 * Subsidiary class
 */

(function() {

  var foo = 5;

  var Child = Base.Child = function() { };

  Child.prototype.age = foo;

})();