Unreal.js provides require function which is a crucial element to live along node.js modules. But Unreal.js is not a node.js, so there are no net, fs, process, http, ...

Only small amount of functions are provided including timer functions(setTimeout, clearTimeout, ...), process.nextTick and fs.readFileSync(which reads UTF8 only).

But modules in node.js are designed to be shallow, so most of modules are just usable!

Perhaps you may even publish your game code into npm to share with others.