How to extend Node's EventEmitter

bus.js

'use strict';

var EventEmitter = require('events').EventEmitter;
var util = require('util');
var Bus;
var bus;

Bus = function () {
    EventEmitter.call(this);
    var self = this;
    
    this.on('foo', function (data) {
       console.log('bar', data); 
    });
}
util.inherits(Bus, EventEmitter);

//Bus.prototype = {} would clobber inherited properties from EventEmitter.
Bus.prototype.foo = function () {}

bus = new Bus();
bus.on('bar', function (data) {
    console.log('buzz', data);
})

module.exports = bus;