emitter extension

emitter.js

var Promise = require('bluebird');
var EventEmitter = require('events');

 function toPromise(emitterLike) {
  return new Promise(function(resolve, reject) {
    emitterLike.once('finish', resolve);
    emitterLike.once('end', resolve);
    emitterLike.once('close', resolve);
    return emitterLike.once('error', reject);
  });
};

if (EventEmitter.prototype.toPromise == null) {
  EventEmitter.prototype.toPromise = function() {
    return toPromise(this);
  };
} else {
  logger.warn("EventEmitter::toPromise already exist! We should change the prototype naming.");
}

module.exports = {
  toPromise: toPromise
};