Fun with event emitters.

event.test.js

var EventEmitter = require('events').EventEmitter;

// Create new class.
myCoolObject = function() {};
myCoolObject.prototype = new EventEmitter;
myCoolObject.prototype.doEventEmmission = function(text) {
   var self = this;
   self.emit('myCoolEvent', 'This is a cool event: ' + text);
};

// Create object instance.
var coolObject = new myCoolObject();

// Register event listener.
coolObject.addListener('myCoolEvent', function(stuff){
   console.log(stuff);
});

// Emit event.
coolObject.doEventEmmission(true);