A super-simple example of typical module.exports usage

app.js

//// app.js
// main application
// @author curtiszimmerman
// @contact software@curtisz.com
// @license AGPL
// @version 0.0.1

var app = (function() {
	// local dependency
	var foo = require('./foo.js');
	
	var uno = foo.foo(0);
	var dos = foo.bar(uno);
})();

foo.js

//// foo.js
// primary application driver library
// @author curtiszimmerman
// @contact software@curtisz.com
// @license AGPL
// @version 0.0.1

var foo = module.exports = (function() {
	var _foo = function( thing ) {
		return ++thing;
	};
  
	var _bar = function( stuff ) {
		return --stuff;
	};
  
	var _init = (function() {
		// some initialization stuff which runs automatically when require()'ed
	})();
  
	return {
		foo: _foo,
		bar: _bar
	};
})();