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