Module 882630

function(t){function e(t){if(t){var r=t;for(var o in e.prototype)r[o]=e.prototype[o];return r}}t.exports=e,e.prototype.on=e.prototype.addEventListener=function(t,e){return this._callbacks=this._callbacks||{},(this._callbacks["$"+t]=this._callbacks["$"+t]||[]).push(e),this},e.prototype.once=function(t,e){function r(){this.off(t,r),e.apply(this,arguments)}return r.fn=e,this.on(t,r),this},e.prototype.off=e.prototype.removeListener=e.prototype.removeAllListeners=e.prototype.removeEventListener=function(t,e){if(this._callbacks=this._callbacks||{},0==arguments.length)return this._callbacks={},this;var r,o=this._callbacks["$"+t];if(!o)return this;if(1==arguments.length)return delete this._callbacks["$"+t],this;for(var n=0;n<o.length;n++)if((r=o[n])===e||r.fn===e){o.splice(n,1);break}return 0===o.length&&delete this._callbacks["$"+t],this},e.prototype.emit=function(t){this._callbacks=this._callbacks||{};for(var e=Array(arguments.length-1),r=this._callbacks["$"+t],o=1;o<arguments.length;o++)e[o-1]=arguments[o];if(r){r=r.slice(0);for(var o=0,n=r.length;o<n;++o)r[o].apply(this,e)}return this},e.prototype.listeners=function(t){return this._callbacks=this._callbacks||{},this._callbacks["$"+t]||[]},e.prototype.hasListeners=function(t){return!!this.listeners(t).length}}