Node.js emit events by inheriting EventEmitter

nodejs_emit_events_1.js

// csvHelper.js
var events = require('events');

function CsvHelper () {
    this.config = null;
    this.data = null;
    
    // Need to instantiate EventEmitter constructor
    events.EventEmitter.call(this);
}

// Copy event functions to this prototype
CsvHelper.prototype.__proto__ = events.EventEmitter.prototype;

// Custom prototyped functions
CsvHelper.prototype.parse = function () {
    // Parse csv data into usable objects
    
    if (parseSuccessful) {
        this.emit('csvHelper.parseSuccessful', data);
    } else {
        this.emit('csvHelper.parseFailed', err);
    }
    
}

CsvHelper.prototype.getHeaders = function () {
    
}

// Use the data
var csvHelper = new CsvHelper();

csvHelper.on('csvHelper.parseSuccessful', function (data) {
    // Tell the user it parsed successfully
});

csvHelper.parse();