Module 882630

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