gistfile1.txt

var EventEmitter = require('events').EventEmitter;
var _ = require('lodash');

function PastEventEmitter() {
  EventEmitter.call(this);
  this.past = [];

  var old_emit = this.emit;
  this.emit = function(event) {
    this.past.push(event);
    old_emit.apply(this, arguments);
  }

  this.after = function(event, listener) {
    listener = _.ary(listener, 0);

    if (this.past.indexOf(event) !== -1) {
      return listener();
    }

    this.on(event, listener);
  };
}

PastEventEmitter.prototype = _.create(EventEmitter.prototype, {
  'constructor': PastEventEmitter
});

module.exports = PastEventEmitter;