socket.io/lib/emitter.js

/**
 * Module dependencies.
 */

var Emitter;

try {
  Emitter = require('emitter');
} catch(e){
  Emitter = require('emitter-component');
}

/**
 * Module exports.
 */

module.exports = Emitter;

/**
 * Compatibility with `WebSocket#addEventListener`.
 *
 * @api public
 */

Emitter.prototype.addEventListener = Emitter.prototype.on;

/**
 * Compatibility with `WebSocket#removeEventListener`.
 *
 * @api public
 */

Emitter.prototype.removeEventListener = Emitter.prototype.off;

/**
 * Node-compatible `EventEmitter#removeListener`
 *
 * @api public
 */

Emitter.prototype.removeListener = Emitter.prototype.off;

/**
 * Node-compatible `EventEmitter#removeAllListeners`
 *
 * @api public
 */

Emitter.prototype.removeAllListeners = function(){
  this._callbacks = {};
};