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