main.js

var util = require('util'),
		MyModule = require("./MyMod"),
		sys = require('sys');

var my = new MyModule();

console.log(util.inspect(my));

my.states["f o"] = "bar";

console.log(util.inspect(my));

MyMod.js

var util = require('util'),
		events = require('events'),
		sys = require('sys');

function MyModule() {
	if(false === (this instanceof MyModule)) {
		return new MyModule();
	}
	events.EventEmitter.call(this);
	this.states = {"hello":"world"};

}
sys.inherits(MyModule, events.EventEmitter);

MyModule.states["fo o"] = "Bar";  //nope

module.exports = MyModule;