commonjs module patterns

index.js

var _modules = require('./modules'),
    Counter = _modules.Counter,
    Entity = _modules.Entity,
    app = {};

require( './routes' )( app, function ( err ) {
  console.log( typeof app.routes );
} );

modules

function Counter ( ) {
  console.log('This the Counter');
}

function Entity ( ) {
  console.log('This the Entity');
}

module.exports.Counter = Counter;
module.exports.Entity = Entity;

routes

module.exports = function ( app, next ) {
  app.routes = {
    '/about' : function ( ) { 
       console.log('this is the /about');
    }
  }
  next( );
}