function EmitterWrapper (emitter) {
  this.listeners = {}
  this.emitter = emitter
}

EmitterWrapper.prototype.addListener = EmitterWrapper.prototype.on = function (event, listener) {
  this.emitter.addListener(event, listener)

  if (!this.listeners.hasOwnProperty(event)) {
    this.listeners[event] = []
  }

  this.listeners[event].push(listener)

  return this
}

EmitterWrapper.prototype.removeAllListeners = function (event) {
  var events = event ? [event] : Object.keys(this.listeners)
  var self = this
  events.forEach(function (event) {
    self.listeners[event].forEach(function (listener) {
      self.emitter.removeListener(event, listener)
    })
    delete self.listeners[event]
  })

  return this
}

module.exports = EmitterWrapper