need.js

// Define modules.

need("cookie", function ( need ){
	function Cookie ( type ) {
		this.type = type;
	}

	Cookie.prototype.getName = function () {
		return this.type + " Cookie";
	}

	return Cookie;
});

need("generate-cookie", function ( need ) {
	var Cookie = need("cookie");

	return function generateCookie () {
		return new Cookie("Chocolate Chip");
	}
});

// Define need function.

function need ( key, value ) {
	if ( !need.cache ) need.cache = {};
	if ( value ) {
		need.cache[key] = { create: value };
		return;
	}
	var obj = need.cache[key];
	if ( !obj ) return;
	if ( !obj.value ) obj.value = obj.create(need);
	return obj.value;
}

// Use it.

var generator = need("generate-cookie");
var cookie = generator();
console.log(cookie.getName());