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// shared.js
YUI.add('shared-lib', function(Y) {
   var Shared = function() {
      // some code
   };

   Y.extend(Shared, Y.Base);
}, '0.0.1', { requires: ['base', 'some-other-libs'] });

// user.js
YUI().use('shared-lib', function(Y) {
   var User = function(cfg) {
      User.superclass.constructor.apply(this, arguments);

      // some code
   };

   Y.extend(User, Shared);

   var user = new User(cfg);
});

// admin.js
YUI().use('shared-lib', 'yui2-some-old-libs', function(Y) {
   var Admin = function(cfg) {
      Admin.superclass.constructor.apply(this, arguments);

      // some code
   };

   Y.extend(Admin, User);

   var admin = new Admin(cfg);
});