nodejs simple & stupid "class" using function style and event emitter

fn.js

const util = require('util');
const EventEmitter = require('events').EventEmitter;

function Fn(opts) {

    function start() {
        this.emit('start', opts);
    }

    // export public functions
    this.start = start;

    return this;
}

util.inherits(Fn, EventEmitter);

module.exports = Fn;

index.js

const Fn = require('./fn');
const fn = new Fn({ foo:'bar' });

// or
//const fn = new (require('./fn'))({ foo:'bar' });

fn.on('start', (data) => {
    console.log('started, foo=%s', data.foo);
});

fn.start();