Emit events directly from a node module while also exporting functions

emitter_demo.js

var emitterModule = require('./emitter_module');
emitterModule.on("e1", function () {
  console.log("emitterModule.e1 handler invoked", arguments);
});
emitterModule.func1();

emitter_module.js

var EventEmitter = require('events').EventEmitter;
var util = require('util');
function EmitterModule() {
  EventEmitter.call(this);
}
util.inherits(EmitterModule, EventEmitter);
var _mod = new EmitterModule();
_mod.func1 = function func1() {
  console.log("emitter_module.func1 called, emitting e1");
  _mod.emit("e1", 42, 43);
};
module.exports = _mod;