gistfile1.txt

var service = function () {
  var ee = new EventEmitter();

  process.nextTick(function () {
    ee.emit('error', 'some error');
    ee.emit('service', 'some serice');
  });

  return {

    error: function (callback) {
     ee.on('error', callback)
    },

    service: function (callback) {
     ee.on('service', callback)
    }

  };

};