Function mixin

packages/socket.io-component-emitter/lib/esm/index.js:19–24

* Mixin the emitter properties. * * @param {Object} obj * @return {Object} * @api private

(obj)

 */

function mixin(obj) {
  for (var key in Emitter.prototype) {
    obj[key] = Emitter.prototype[key];
  }
  return obj;
}

/**
 * Listen on the given `event` with `fn`.