/*!
 * Engine.IO v6.1.1
 * (c) 2014-2021 Guillermo Rauch
 * Released under the MIT License.
 */
!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).eio=e()}(this,(function(){"use strict";function t(e){return t="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t},t(e)}function e(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")}function r(t,e){for(var r=0;r<e.length;r++){var n=e[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}function n(t,e,n){return e&&r(t.prototype,e),n&&r(t,n),t}function o(){return o=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var r=arguments[e];for(var n in r)Object.prototype.hasOwnProperty.call(r,n)&&(t[n]=r[n])}return t},o.apply(this,arguments)}function s(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,writable:!0,configurable:!0}}),e&&a(t,e)}function i(t){return i=Object.setPrototypeOf?Object.getPrototypeOf:function(t){return t.__proto__||Object.getPrototypeOf(t)},i(t)}function a(t,e){return a=Object.setPrototypeOf||function(t,e){return t.__proto__=e,t},a(t,e)}function u(t){if(void 0===t)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return t}function c(t,e){return!e||"object"!=typeof e&&"function"!=typeof e?u(t):e}function h(t){var e=function(){if("undefined"==typeof Reflect||!Reflect.construct)return!1;if(Reflect.construct.sham)return!1;if("function"==typeof Proxy)return!0;try{return Date.prototype.toString.call(Reflect.construct(Date,[],(function(){}))),!0}catch(t){return!1}}();return function(){var r,n=i(t);if(e){var o=i(this).constructor;r=Reflect.construct(n,arguments,o)}else r=n.apply(this,arguments);return c(this,r)}}function p(t,e,r){return p="undefined"!=typeof Reflect&&Reflect.get?Reflect.get:function(t,e,r){var n=function(t,e){for(;!Object.prototype.hasOwnProperty.call(t,e)&&null!==(t=i(t)););return t}(t,e);if(n){var o=Object.getOwnPropertyDescriptor(n,e);return o.get?o.get.call(r):o.value}},p(t,e,r||t)}var l={exports:{}};try{l.exports="undefined"!=typeof XMLHttpRequest&&"withCredentials"in new XMLHttpRequest}catch(t){l.exports=!1}var f=l.exports,d="undefined"!=typeof self?self:"undefined"!=typeof window?window:Function("return this")();function y(t){var e=t.xdomain;try{if("undefined"!=typeof XMLHttpRequest&&(!e||f))return new XMLHttpRequest}catch(t){}if(!e)try{return new(d[["Active"].concat("Object").join("X")])("Microsoft.XMLHTTP")}catch(t){}}function v(t){for(var e=arguments.length,r=new Array(e>1?e-1:0),n=1;n<e;n++)r[n-1]=arguments[n];return r.reduce((function(e,r){return t.hasOwnProperty(r)&&(e[r]=t[r]),e}),{})}var m=setTimeout,g=clearTimeout;function b(t,e){e.useNativeTimers?(t.setTimeoutFn=m.bind(d),t.clearTimeoutFn=g.bind(d)):(t.setTimeoutFn=setTimeout.bind(d),t.clearTimeoutFn=clearTimeout.bind(d))}var k=w;function w(t){if(t)return function(t){for(var e in w.prototype)t[e]=w.prototype[e];return t}(t)}w.prototype.on=w.prototype.addEventListener=function(t,e){return this._callbacks=this._callbacks||{},(this._callbacks["$"+t]=this._callbacks["$"+t]||[]).push(e),this},w.prototype.once=function(t,e){function r(){this.off(t,r),e.apply(this,arguments)}return r.fn=e,this.on(t,r),this},w.prototype.off=w.prototype.removeListener=w.prototype.removeAllListeners=w.prototype.removeEventListener=function(t,e){if(this._callbacks=this._callbacks||{},0==arguments.length)return this._callbacks={},this;var r,n=this._callbacks["$"+t];if(!n)return this;if(1==arguments.length)return delete this._callbacks["$"+t],this;for(var o=0;o<n.length;o++)if((r=n[o])===e||r.fn===e){n.splice(o,1);break}return 0===n.length&&delete this._callbacks["$"+t],this},w.prototype.emit=function(t){this._callbacks=this._callbacks||{};for(var e=new Array(arguments.length-1),r=this._callbacks["$"+t],n=1;n<arguments.length;n++)e[n-1]=arguments[n];if(r){n=0;for(var o=(r=r.slice(0)).length;n<o;++n)r[n].apply(this,e)}return this},w.prototype.emitReserved=w.prototype.emit,w.prototype.listeners=function(t){return this._callbacks=this._callbacks||{},this._callbacks["$"+t]||[]},w.prototype.hasListeners=function(t){return!!this.listeners(t).length};var T=Object.create(null);T.open="0",T.close="1",T.ping="2",T.pong="3",T.message="4",T.upgrade="5",T.noop="6";var S=Object.create(null);Object.keys(T).forEach((function(t){S[T[t]]=t}));for(var x={type:"error",data:"parser error"},O="function"==typeof Blob||"undefined"!=typeof Blob&&"[object BlobConstructor]"===Object.prototype.toString.call(Blob),E="function"==typeof ArrayBuffer,R=function(t,e,r){var n,o=t.type,s=t.data;return O&&s instanceof Blob?e?r(s):C(s,r):E&&(s instanceof ArrayBuffer||(n=s,"function"==typeof ArrayBuffer.isView?ArrayBuffer.isView(n):n&&n.buffer instanceof ArrayBuffer))?e?r(s):C(new Blob([s]),r):r(T[o]+(s||""))},C=function(t,e){var r=new FileReader;return r.onload=function(){var t=r.result.split(",")[1];e("b"+t)},r.readAsDataURL(t)},q="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",B="undefined"==typeof Uint8Array?[]:new Uint8Array(256),L=0;L<q.length;L++)B[q.charCodeAt(L)]=L;var P,A="function"==typeof ArrayBuffer,_=function(t,e){if("string"!=typeof t)return{type:"message",data:U(t,e)};var r=t.charAt(0);return"b"===r?{type:"message",data:j(t.substring(1),e)}:S[r]?t.length>1?{type:S[r],data:t.substring(1)}:{type:S[r]}:x},j=function(t,e){if(A){var r=function(t){var e,r,n,o,s,i=.75*t.length,a=t.length,u=0;"="===t[t.length-1]&&(i--,"="===t[t.length-2]&&i--);var c=new ArrayBuffer(i),h=new Uint8Array(c);for(e=0;e<a;e+=4)r=B[t.charCodeAt(e)],n=B[t.charCodeAt(e+1)],o=B[t.charCodeAt(e+2)],s=B[t.charCodeAt(e+3)],h[u++]=r<<2|n>>4,h[u++]=(15&n)<<4|o>>2,h[u++]=(3&o)<<6|63&s;return c}(t);return U(r,e)}return{base64:!0,data:t}},U=function(t,e){return"blob"===e&&t instanceof ArrayBuffer?new Blob([t]):t},H=String.fromCharCode(30),D=function(t){s(o,t);var r=h(o);function o(t){var n;return e(this,o),(n=r.call(this)).writable=!1,b(u(n),t),n.opts=t,n.query=t.query,n.readyState="",n.socket=t.socket,n}return n(o,[{key:"onError",value:function(t,e){var r=new Error(t);return r.type="TransportError",r.description=e,p(i(o.prototype),"emit",this).call(this,"error",r),this}},{key:"open",value:function(){return"closed"!==this.readyState&&""!==this.readyState||(this.readyState="opening",this.doOpen()),this}},{key:"close",value:function(){return"opening"!==this.readyState&&"open"!==this.readyState||(this.doClose(),this.onClose()),this}},{key:"send",value:function(t){"open"===this.readyState&&this.write(t)}},{key:"onOpen",value:function(){this.readyState="open",this.writable=!0,p(i(o.prototype),"emit",this).call(this,"open")}},{key:"onData",value:function(t){var e=_(t,this.socket.binaryType);this.onPacket(e)}},{key:"onPacket",value:function(t){p(i(o.prototype),"emit",this).call(this,"packet",t)}},{key:"onClose",value:function(){this.readyState="closed",p(i(o.prototype),"emit",this).call(this,"close")}}]),o}(k),F="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_".split(""),I={},M=0,W=0;function N(t){var e="";do{e=F[t%64]+e,t=Math.floor(t/64)}while(t>0);return e}function X(){var t=N(+new Date);return t!==P?(M=0,P=t):t+"."+N(M++)}for(;W<64;W++)I[F[W]]=W;X.encode=N,X.decode=function(t){var e=0;for(W=0;W<t.length;W++)e=64*e+I[t.charAt(W)];return e};var $=X,z={encode:function(t){var e="";for(var r in t)t.hasOwnProperty(r)&&(e.length&&(e+="&"),e+=encodeURIComponent(r)+"="+encodeURIComponent(t[r]));return e},decode:function(t){for(var e={},r=t.split("&"),n=0,o=r.length;n<o;n++){var s=r[n].split("=");e[decodeURIComponent(s[0])]=decodeURIComponent(s[1])}return e}},V=function(t){s(o,t);var r=h(o);function o(){var t;return e(this,o),(t=r.apply(this,arguments)).polling=!1,t}return n(o,[{key:"doOpen",value:function(){this.poll()}},{key:"pause",value:function(t){var e=this;this.readyState="pausing";var r=function(){e.readyState="paused",t()};if(this.polling||!this.writable){var n=0;this.polling&&(n++,this.once("pollComplete",(function(){--n||r()}))),this.writable||(n++,this.once("drain",(function(){--n||r()})))}else r()}},{key:"poll",value:function(){this.polling=!0,this.doPoll(),this.emit("poll")}},{key:"onData",value:function(t){var e=this;(function(t,e){for(var r=t.split(H),n=[],o=0;o<r.length;o++){var s=_(r[o],e);if(n.push(s),"error"===s.type)break}return n})(t,this.socket.binaryType).forEach((function(t){if("opening"===e.readyState&&"open"===t.type&&e.onOpen(),"close"===t.type)return e.onClose(),!1;e.onPacket(t)})),"closed"!==this.readyState&&(this.polling=!1,this.emit("pollComplete"),"open"===this.readyState&&this.poll())}},{key:"doClose",value:function(){var t=this,e=function(){t.write([{type:"close"}])};"open"===this.readyState?e():this.once("open",e)}},{key:"write",value:function(t){var e=this;this.writable=!1,function(t,e){var r=t.length,n=new Array(r),o=0;t.forEach((function(t,s){R(t,!1,(function(t){n[s]=t,++o===r&&e(n.join(H))}))}))}(t,(function(t){e.doWrite(t,(function(){e.writable=!0,e.emit("drain")}))}))}},{key:"uri",value:function(){var t=this.query||{},e=this.opts.secure?"https":"http",r="";!1!==this.opts.timestampRequests&&(t[this.opts.timestampParam]=$()),this.supportsBinary||t.sid||(t.b64=1),this.opts.port&&("https"===e&&443!==Number(this.opts.port)||"http"===e&&80!==Number(this.opts.port))&&(r=":"+this.opts.port);var n=z.encode(t);return e+"://"+(-1!==this.opts.hostname.indexOf(":")?"["+this.opts.hostname+"]":this.opts.hostname)+r+this.opts.path+(n.length?"?"+n:"")}},{key:"name",get:function(){return"polling"}}]),o}(D);function G(){}var J=null!=new y({xdomain:!1}).responseType,K=function(t){s(i,t);var r=h(i);function i(t){var n;if(e(this,i),n=r.call(this,t),"undefined"!=typeof location){var o="https:"===location.protocol,s=location.port;s||(s=o?"443":"80"),n.xd="undefined"!=typeof location&&t.hostname!==location.hostname||s!==t.port,n.xs=t.secure!==o}var a=t&&t.forceBase64;return n.supportsBinary=J&&!a,n}return n(i,[{key:"request",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};return o(t,{xd:this.xd,xs:this.xs},this.opts),new Q(this.uri(),t)}},{key:"doWrite",value:function(t,e){var r=this,n=this.request({method:"POST",data:t});n.on("success",e),n.on("error",(function(t){r.onError("xhr post error",t)}))}},{key:"doPoll",value:function(){var t=this,e=this.request();e.on("data",this.onData.bind(this)),e.on("error",(function(e){t.onError("xhr poll error",e)})),this.pollXhr=e}}]),i}(V),Q=function(t){s(o,t);var r=h(o);function o(t,n){var s;return e(this,o),b(u(s=r.call(this)),n),s.opts=n,s.method=n.method||"GET",s.uri=t,s.async=!1!==n.async,s.data=void 0!==n.data?n.data:null,s.create(),s}return n(o,[{key:"create",value:function(){var t=this,e=v(this.opts,"agent","pfx","key","passphrase","cert","ca","ciphers","rejectUnauthorized","autoUnref");e.xdomain=!!this.opts.xd,e.xscheme=!!this.opts.xs;var r=this.xhr=new y(e);try{r.open(this.method,this.uri,this.async);try{if(this.opts.extraHeaders)for(var n in r.setDisableHeaderCheck&&r.setDisableHeaderCheck(!0),this.opts.extraHeaders)this.opts.extraHeaders.hasOwnProperty(n)&&r.setRequestHeader(n,this.opts.extraHeaders[n])}catch(t){}if("POST"===this.method)try{r.setRequestHeader("Content-type","text/plain;charset=UTF-8")}catch(t){}try{r.setRequestHeader("Accept","*/*")}catch(t){}"withCredentials"in r&&(r.withCredentials=this.opts.withCredentials),this.opts.requestTimeout&&(r.timeout=this.opts.requestTimeout),r.onreadystatechange=function(){4===r.readyState&&(200===r.status||1223===r.status?t.onLoad():t.setTimeoutFn((function(){t.onError("number"==typeof r.status?r.status:0)}),0))},r.send(this.data)}catch(e){return void this.setTimeoutFn((function(){t.onError(e)}),0)}"undefined"!=typeof document&&(this.index=o.requestsCount++,o.requests[this.index]=this)}},{key:"onSuccess",value:function(){this.emit("success"),this.cleanup()}},{key:"onData",value:function(t){this.emit("data",t),this.onSuccess()}},{key:"onError",value:function(t){this.emit("error",t),this.cleanup(!0)}},{key:"cleanup",value:function(t){if(void 0!==this.xhr&&null!==this.xhr){if(this.xhr.onreadystatechange=G,t)try{this.xhr.abort()}catch(t){}"undefined"!=typeof document&&delete o.requests[this.index],this.xhr=null}}},{key:"onLoad",value:function(){var t=this.xhr.responseText;null!==t&&this.onData(t)}},{key:"abort",value:function(){this.cleanup()}}]),o}(k);if(Q.requestsCount=0,Q.requests={},"undefined"!=typeof document)if("function"==typeof attachEvent)attachEvent("onunload",Y);else if("function"==typeof addEventListener){addEventListener("onpagehide"in d?"pagehide":"unload",Y,!1)}function Y(){for(var t in Q.requests)Q.requests.hasOwnProperty(t)&&Q.requests[t].abort()}var Z="function"==typeof Promise&&"function"==typeof Promise.resolve?function(t){return Promise.resolve().then(t)}:function(t,e){return e(t,0)},tt=d.WebSocket||d.MozWebSocket,et="undefined"!=typeof navigator&&"string"==typeof navigator.product&&"reactnative"===navigator.product.toLowerCase(),rt=function(t){s(o,t);var r=h(o);function o(t){var n;return e(this,o),(n=r.call(this,t)).supportsBinary=!t.forceBase64,n}return n(o,[{key:"doOpen",value:function(){if(this.check()){var t=this.uri(),e=this.opts.protocols,r=et?{}:v(this.opts,"agent","perMessageDeflate","pfx","key","passphrase","cert","ca","ciphers","rejectUnauthorized","localAddress","protocolVersion","origin","maxPayload","family","checkServerIdentity");this.opts.extraHeaders&&(r.headers=this.opts.extraHeaders);try{this.ws=et?new tt(t,e,r):e?new tt(t,e):new tt(t)}catch(t){return this.emit("error",t)}this.ws.binaryType=this.socket.binaryType||"arraybuffer",this.addEventListeners()}}},{key:"addEventListeners",value:function(){var t=this;this.ws.onopen=function(){t.opts.autoUnref&&t.ws._socket.unref(),t.onOpen()},this.ws.onclose=this.onClose.bind(this),this.ws.onmessage=function(e){return t.onData(e.data)},this.ws.onerror=function(e){return t.onError("websocket error",e)}}},{key:"write",value:function(t){var e=this;this.writable=!1;for(var r=function(r){var n=t[r],o=r===t.length-1;R(n,e.supportsBinary,(function(t){try{e.ws.send(t)}catch(t){}o&&Z((function(){e.writable=!0,e.emit("drain")}),e.setTimeoutFn)}))},n=0;n<t.length;n++)r(n)}},{key:"doClose",value:function(){void 0!==this.ws&&(this.ws.close(),this.ws=null)}},{key:"uri",value:function(){var t=this.query||{},e=this.opts.secure?"wss":"ws",r="";this.opts.port&&("wss"===e&&443!==Number(this.opts.port)||"ws"===e&&80!==Number(this.opts.port))&&(r=":"+this.opts.port),this.opts.timestampRequests&&(t[this.opts.timestampParam]=$()),this.supportsBinary||(t.b64=1);var n=z.encode(t);return e+"://"+(-1!==this.opts.hostname.indexOf(":")?"["+this.opts.hostname+"]":this.opts.hostname)+r+this.opts.path+(n.length?"?"+n:"")}},{key:"check",value:function(){return!(!tt||"__initialize"in tt&&this.name===o.prototype.name)}},{key:"name",get:function(){return"websocket"}}]),o}(D),nt={websocket:rt,polling:K},ot=/^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/,st=["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"],it=function(t){var e=t,r=t.indexOf("["),n=t.indexOf("]");-1!=r&&-1!=n&&(t=t.substring(0,r)+t.substring(r,n).replace(/:/g,";")+t.substring(n,t.length));for(var o,s,i=ot.exec(t||""),a={},u=14;u--;)a[st[u]]=i[u]||"";return-1!=r&&-1!=n&&(a.source=e,a.host=a.host.substring(1,a.host.length-1).replace(/;/g,":"),a.authority=a.authority.replace("[","").replace("]","").replace(/;/g,":"),a.ipv6uri=!0),a.pathNames=function(t,e){var r=/\/{2,9}/g,n=e.replace(r,"/").split("/");"/"!=e.substr(0,1)&&0!==e.length||n.splice(0,1);"/"==e.substr(e.length-1,1)&&n.splice(n.length-1,1);return n}(0,a.path),a.queryKey=(o=a.query,s={},o.replace(/(?:^|&)([^&=]*)=?([^&]*)/g,(function(t,e,r){e&&(s[e]=r)})),s),a};var at=function(r){s(a,r);var i=h(a);function a(r){var n,s=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{};return e(this,a),n=i.call(this),r&&"object"===t(r)&&(s=r,r=null),r?(r=it(r),s.hostname=r.host,s.secure="https"===r.protocol||"wss"===r.protocol,s.port=r.port,r.query&&(s.query=r.query)):s.host&&(s.hostname=it(s.host).host),b(u(n),s),n.secure=null!=s.secure?s.secure:"undefined"!=typeof location&&"https:"===location.protocol,s.hostname&&!s.port&&(s.port=n.secure?"443":"80"),n.hostname=s.hostname||("undefined"!=typeof location?location.hostname:"localhost"),n.port=s.port||("undefined"!=typeof location&&location.port?location.port:n.secure?"443":"80"),n.transports=s.transports||["polling","websocket"],n.readyState="",n.writeBuffer=[],n.prevBufferLen=0,n.opts=o({path:"/engine.io",agent:!1,withCredentials:!1,upgrade:!0,timestampParam:"t",rememberUpgrade:!1,rejectUnauthorized:!0,perMessageDeflate:{threshold:1024},transportOptions:{},closeOnBeforeunload:!0},s),n.opts.path=n.opts.path.replace(/\/$/,"")+"/","string"==typeof n.opts.query&&(n.opts.query=z.decode(n.opts.query)),n.id=null,n.upgrades=null,n.pingInterval=null,n.pingTimeout=null,n.pingTimeoutTimer=null,"function"==typeof addEventListener&&(n.opts.closeOnBeforeunload&&addEventListener("beforeunload",(function(){n.transport&&(n.transport.removeAllListeners(),n.transport.close())}),!1),"localhost"!==n.hostname&&(n.offlineEventListener=function(){n.onClose("transport close")},addEventListener("offline",n.offlineEventListener,!1))),n.open(),n}return n(a,[{key:"createTransport",value:function(t){var e=function(t){var e={};for(var r in t)t.hasOwnProperty(r)&&(e[r]=t[r]);return e}(this.opts.query);e.EIO=4,e.transport=t,this.id&&(e.sid=this.id);var r=o({},this.opts.transportOptions[t],this.opts,{query:e,socket:this,hostname:this.hostname,secure:this.secure,port:this.port});return new nt[t](r)}},{key:"open",value:function(){var t,e=this;if(this.opts.rememberUpgrade&&a.priorWebsocketSuccess&&-1!==this.transports.indexOf("websocket"))t="websocket";else{if(0===this.transports.length)return void this.setTimeoutFn((function(){e.emitReserved("error","No transports available")}),0);t=this.transports[0]}this.readyState="opening";try{t=this.createTransport(t)}catch(t){return this.transports.shift(),void this.open()}t.open(),this.setTransport(t)}},{key:"setTransport",value:function(t){var e=this;this.transport&&this.transport.removeAllListeners(),this.transport=t,t.on("drain",this.onDrain.bind(this)).on("packet",this.onPacket.bind(this)).on("error",this.onError.bind(this)).on("close",(function(){e.onClose("transport close")}))}},{key:"probe",value:function(t){var e=this,r=this.createTransport(t),n=!1;a.priorWebsocketSuccess=!1;var o=function(){n||(r.send([{type:"ping",data:"probe"}]),r.once("packet",(function(t){if(!n)if("pong"===t.type&&"probe"===t.data){if(e.upgrading=!0,e.emitReserved("upgrading",r),!r)return;a.priorWebsocketSuccess="websocket"===r.name,e.transport.pause((function(){n||"closed"!==e.readyState&&(p(),e.setTransport(r),r.send([{type:"upgrade"}]),e.emitReserved("upgrade",r),r=null,e.upgrading=!1,e.flush())}))}else{var o=new Error("probe error");o.transport=r.name,e.emitReserved("upgradeError",o)}})))};function s(){n||(n=!0,p(),r.close(),r=null)}var i=function(t){var n=new Error("probe error: "+t);n.transport=r.name,s(),e.emitReserved("upgradeError",n)};function u(){i("transport closed")}function c(){i("socket closed")}function h(t){r&&t.name!==r.name&&s()}var p=function(){r.removeListener("open",o),r.removeListener("error",i),r.removeListener("close",u),e.off("close",c),e.off("upgrading",h)};r.once("open",o),r.once("error",i),r.once("close",u),this.once("close",c),this.once("upgrading",h),r.open()}},{key:"onOpen",value:function(){if(this.readyState="open",a.priorWebsocketSuccess="websocket"===this.transport.name,this.emitReserved("open"),this.flush(),"open"===this.readyState&&this.opts.upgrade&&this.transport.pause)for(var t=0,e=this.upgrades.length;t<e;t++)this.probe(this.upgrades[t])}},{key:"onPacket",value:function(t){if("opening"===this.readyState||"open"===this.readyState||"closing"===this.readyState)switch(this.emitReserved("packet",t),this.emitReserved("heartbeat"),t.type){case"open":this.onHandshake(JSON.parse(t.data));break;case"ping":this.resetPingTimeout(),this.sendPacket("pong"),this.emitReserved("ping"),this.emitReserved("pong");break;case"error":var e=new Error("server error");e.code=t.data,this.onError(e);break;case"message":this.emitReserved("data",t.data),this.emitReserved("message",t.data)}}},{key:"onHandshake",value:function(t){this.emitReserved("handshake",t),this.id=t.sid,this.transport.query.sid=t.sid,this.upgrades=this.filterUpgrades(t.upgrades),this.pingInterval=t.pingInterval,this.pingTimeout=t.pingTimeout,this.onOpen(),"closed"!==this.readyState&&this.resetPingTimeout()}},{key:"resetPingTimeout",value:function(){var t=this;this.clearTimeoutFn(this.pingTimeoutTimer),this.pingTimeoutTimer=this.setTimeoutFn((function(){t.onClose("ping timeout")}),this.pingInterval+this.pingTimeout),this.opts.autoUnref&&this.pingTimeoutTimer.unref()}},{key:"onDrain",value:function(){this.writeBuffer.splice(0,this.prevBufferLen),this.prevBufferLen=0,0===this.writeBuffer.length?this.emitReserved("drain"):this.flush()}},{key:"flush",value:function(){"closed"!==this.readyState&&this.transport.writable&&!this.upgrading&&this.writeBuffer.length&&(this.transport.send(this.writeBuffer),this.prevBufferLen=this.writeBuffer.length,this.emitReserved("flush"))}},{key:"write",value:function(t,e,r){return this.sendPacket("message",t,e,r),this}},{key:"send",value:function(t,e,r){return this.sendPacket("message",t,e,r),this}},{key:"sendPacket",value:function(t,e,r,n){if("function"==typeof e&&(n=e,e=void 0),"function"==typeof r&&(n=r,r=null),"closing"!==this.readyState&&"closed"!==this.readyState){(r=r||{}).compress=!1!==r.compress;var o={type:t,data:e,options:r};this.emitReserved("packetCreate",o),this.writeBuffer.push(o),n&&this.once("flush",n),this.flush()}}},{key:"close",value:function(){var t=this,e=function(){t.onClose("forced close"),t.transport.close()},r=function r(){t.off("upgrade",r),t.off("upgradeError",r),e()},n=function(){t.once("upgrade",r),t.once("upgradeError",r)};return"opening"!==this.readyState&&"open"!==this.readyState||(this.readyState="closing",this.writeBuffer.length?this.once("drain",(function(){t.upgrading?n():e()})):this.upgrading?n():e()),this}},{key:"onError",value:function(t){a.priorWebsocketSuccess=!1,this.emitReserved("error",t),this.onClose("transport error",t)}},{key:"onClose",value:function(t,e){"opening"!==this.readyState&&"open"!==this.readyState&&"closing"!==this.readyState||(this.clearTimeoutFn(this.pingTimeoutTimer),this.transport.removeAllListeners("close"),this.transport.close(),this.transport.removeAllListeners(),"function"==typeof removeEventListener&&removeEventListener("offline",this.offlineEventListener,!1),this.readyState="closed",this.id=null,this.emitReserved("close",t,e),this.writeBuffer=[],this.prevBufferLen=0)}},{key:"filterUpgrades",value:function(t){for(var e=[],r=0,n=t.length;r<n;r++)~this.transports.indexOf(t[r])&&e.push(t[r]);return e}}]),a}(k);at.protocol=4;return function(t,e){return new at(t,e)}}));
//# sourceMappingURL=engine.io.min.js.map