diff --git a/.eslintrc.json b/.eslintrc.json
deleted file mode 100644
index a7cd3cc3e..000000000
--- a/.eslintrc.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "extends": "prettier",
-  "parser": "babel-eslint",
-  "env": {
-    "node": true,
-    "browser": true
-  }
-}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a3a62a10d..ee626d3c3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [14, 16]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ba93f0b7..c584278ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,95 @@
+## [6.0.3](https://github.com/socketio/engine.io-client/compare/6.0.2...6.0.3) (2021-11-14)
+
+Some bug fixes were backported from master, to be included by the latest `socket.io-client` version.
+
+### Bug Fixes
+
+* add package name in nested package.json ([32511ee](https://github.com/socketio/engine.io-client/commit/32511ee32a0a6122e99db35833ed948aa4e427ac))
+* fix vite build for CommonJS users ([9fcaf58](https://github.com/socketio/engine.io-client/commit/9fcaf58d18c013c0b92fdaf27481f0383efb3658))
+
+
+
+## [6.1.1](https://github.com/socketio/engine.io-client/compare/6.1.0...6.1.1) (2021-11-14)
+
+
+### Bug Fixes
+
+* add package name in nested package.json ([6e798fb](https://github.com/socketio/engine.io-client/commit/6e798fbb5b11a1cfec03ece3dfce03213b5f9a12))
+* fix vite build for CommonJS users ([c557707](https://github.com/socketio/engine.io-client/commit/c557707fb694bd10397b4cd8b4ec2fbe59128faa))
+
+
+
+# [6.1.0](https://github.com/socketio/engine.io-client/compare/6.0.2...6.1.0) (2021-11-08)
+
+The minor bump is due to changes on the server side.
+
+### Bug Fixes
+
+* **typings:** allow any value in the query option ([018e1af](https://github.com/socketio/engine.io-client/commit/018e1afcc5ef5eac81e9e1629db053bda44120ee))
+* **typings:** allow port to be a number ([#680](https://github.com/socketio/engine.io-client/issues/680)) ([8f68f77](https://github.com/socketio/engine.io-client/commit/8f68f77825af069fe2c612a3200a025d4130ac0a))
+
+
+
+## [6.0.2](https://github.com/socketio/engine.io-client/compare/6.0.1...6.0.2) (2021-10-15)
+
+
+### Bug Fixes
+
+* **bundle:** fix vite build ([faa9f31](https://github.com/socketio/engine.io-client/commit/faa9f318e70cd037af79bfa20e9d21b284ddf257))
+
+
+
+## [6.0.1](https://github.com/socketio/engine.io-client/compare/6.0.0...6.0.1) (2021-10-14)
+
+
+### Bug Fixes
+
+* fix usage with vite ([4971914](https://github.com/socketio/engine.io-client/commit/49719142f65e23efa65fca4f66765ded5d955972))
+
+
+# [6.0.0](https://github.com/socketio/engine.io-client/compare/5.2.0...6.0.0) (2021-10-08)
+
+This major release contains three important changes:
+
+- the codebase was migrated to TypeScript ([7245b80](https://github.com/socketio/engine.io-client/commit/7245b803e0c8d57cfc1f1cd8b8c8d598e8397967))
+- rollup is now used instead of webpack to create the bundles ([27de300](https://github.com/socketio/engine.io-client/commit/27de300de42420ab59a02ec7a3445e636cbcc78e))
+- code that provided support for ancient browsers (think IE8) was removed ([c656192](https://github.com/socketio/engine.io-client/commit/c6561928be628084fd2f5e7a70943c8e5c582873) and [b2c7381](https://github.com/socketio/engine.io-client/commit/b2c73812e978489b5dfbe516a26b6b8fd628856d))
+
+There is now three distinct builds (in the build/ directory):
+
+- CommonJS
+- ESM with debug
+- ESM without debug (rationale here: [00d7e7d](https://github.com/socketio/engine.io-client/commit/00d7e7d7ee85b4cfa6f9f547203cc692083ac61c))
+
+And three bundles (in the dist/ directory) :
+
+- `engine.io.js`: unminified UMD bundle
+- `engine.io.min.js`: minified UMD bundle
+- `engine.io.esm.min.js`: ESM bundle
+
+Please note that the communication protocol was not updated, so a v5 client will be able to reach a v6 server (and vice-versa).
+
+Reference: https://github.com/socketio/engine.io-protocol
+
+### Features
+
+* provide an ESM build without debug ([00d7e7d](https://github.com/socketio/engine.io-client/commit/00d7e7d7ee85b4cfa6f9f547203cc692083ac61c))
+
+### BREAKING CHANGES
+
+* the enableXDR option is removed ([c656192](https://github.com/socketio/engine.io-client/commit/c6561928be628084fd2f5e7a70943c8e5c582873))
+* the jsonp and forceJSONP options are removed ([b2c7381](https://github.com/socketio/engine.io-client/commit/b2c73812e978489b5dfbe516a26b6b8fd628856d))
+
+`ws` version: `~8.2.3`
+
+# [5.2.0](https://github.com/socketio/engine.io-client/compare/5.1.2...5.2.0) (2021-08-29)
+
+
+### Features
+
+* add an option to use native timer functions ([#672](https://github.com/socketio/engine.io-client/issues/672)) ([5d1d5be](https://github.com/socketio/engine.io-client/commit/5d1d5bea11ab6854473ddc02a3391929ea4fc8f4))
+
+
 ## [5.1.2](https://github.com/socketio/engine.io-client/compare/5.1.1...5.1.2) (2021-06-24)
 
 
diff --git a/README.md b/README.md
index c29ff28df..94baf6f74 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,8 @@ Engine.IO is a commonjs module, which means you can include it by using
 1. write your app code
 
     ```js
-    const socket = require('engine.io-client')('ws://localhost');
+    const { Socket } = require('engine.io-client');
+    const socket = new Socket('ws://localhost');
     socket.on('open', () => {
       socket.on('message', (data) => {});
       socket.on('close', () => {});
@@ -65,7 +66,7 @@ Engine.IO is a commonjs module, which means you can include it by using
 ```html
 <script src="/path/to/engine.io.js"></script>
 <script>
-  const socket = new eio.Socket('ws://localhost/');
+  const socket = eio('ws://localhost/');
   socket.binaryType = 'blob';
   socket.on('open', () => {
     socket.send(new Int8Array(5));
@@ -80,7 +81,8 @@ Engine.IO is a commonjs module, which means you can include it by using
 Add `engine.io-client` to your `package.json` and then:
 
 ```js
-const socket = require('engine.io-client')('ws://localhost');
+const { Socket } = require('engine.io-client');
+const socket = new Socket('ws://localhost');
 socket.on('open', () => {
   socket.on('message', (data) => {});
   socket.on('close', () => {});
@@ -95,7 +97,8 @@ const opts = {
   ca: fs.readFileSync('test/fixtures/ca.crt')
 };
 
-const socket = require('engine.io-client')('ws://localhost', opts);
+const { Socket } = require('engine.io-client');
+const socket = new Socket('ws://localhost', opts);
 socket.on('open', () => {
   socket.on('message', (data) => {});
   socket.on('close', () => {});
@@ -111,7 +114,8 @@ const opts = {
   }
 };
 
-const socket = require('engine.io-client')('ws://localhost', opts);
+const { Socket } = require('engine.io-client');
+const socket = new Socket('ws://localhost', opts);
 socket.on('open', () => {
   socket.on('message', (data) => {});
   socket.on('close', () => {});
@@ -124,13 +128,13 @@ Please note that in this case the headers won't be sent in the WebSocket upgrade
 
 ```js
 // WILL NOT WORK in the browser
-require('engine.io-client')('http://localhost', {
+const socket = new Socket('http://localhost', {
   extraHeaders: {
     'X-Custom-Header-For-My-Project': 'will not be sent'
   }
 });
 // WILL NOT WORK
-require('engine.io-client')('http://localhost', {
+const socket = new Socket('http://localhost', {
   transports: ['websocket'], // polling is disabled
   transportOptions: {
     polling: {
@@ -141,7 +145,7 @@ require('engine.io-client')('http://localhost', {
   }
 });
 // WILL WORK
-require('engine.io-client')('http://localhost', {
+const socket = new Socket('http://localhost', {
   transports: ['polling', 'websocket'],
   transportOptions: {
     polling: {
@@ -222,15 +226,7 @@ Exposed as `eio` in the browser standalone build.
       - `agent` (`http.Agent`): `http.Agent` to use, defaults to `false` (NodeJS only)
       - `upgrade` (`Boolean`): defaults to true, whether the client should try
       to upgrade the transport from long-polling to something better.
-      - `forceJSONP` (`Boolean`): forces JSONP for polling transport.
-      - `jsonp` (`Boolean`): determines whether to use JSONP when
-        necessary for polling. If disabled (by settings to false) an error will
-        be emitted (saying "No transports available") if no other transports
-        are available. If another transport is available for opening a
-        connection (e.g. WebSocket) that transport
-        will be used instead.
       - `forceBase64` (`Boolean`): forces base 64 encoding for polling transport even when XHR2 responseType is available and WebSocket even if the used standard supports binary.
-      - `enablesXDR` (`Boolean`): enables XDomainRequest for IE8 to avoid loading bar flashing with click sound. default to `false` because XDomainRequest has a flaw of not sending cookie.
       - `withCredentials` (`Boolean`): defaults to `false`, whether to include credentials (cookies, authorization headers, TLS client certificates, etc.) with cross-origin XHR polling requests.
       - `timestampRequests` (`Boolean`): whether to add the timestamp with each
         transport request. Note: polling requests are always stamped unless this
diff --git a/dist/engine.io.esm.min.js b/dist/engine.io.esm.min.js
new file mode 100644
index 000000000..a463b2ea7
--- /dev/null
+++ b/dist/engine.io.esm.min.js
@@ -0,0 +1,7 @@
+/*!
+ * Engine.IO v6.1.1
+ * (c) 2014-2021 Guillermo Rauch
+ * Released under the MIT License.
+ */
+var t={exports:{}};try{t.exports="undefined"!=typeof XMLHttpRequest&&"withCredentials"in new XMLHttpRequest}catch(e){t.exports=!1}var e=t.exports,s="undefined"!=typeof self?self:"undefined"!=typeof window?window:Function("return this")();function r(t){const r=t.xdomain;try{if("undefined"!=typeof XMLHttpRequest&&(!r||e))return new XMLHttpRequest}catch(t){}if(!r)try{return new(s[["Active"].concat("Object").join("X")])("Microsoft.XMLHTTP")}catch(t){}}function o(t,...e){return e.reduce(((e,s)=>(t.hasOwnProperty(s)&&(e[s]=t[s]),e)),{})}const i=setTimeout,n=clearTimeout;function a(t,e){e.useNativeTimers?(t.setTimeoutFn=i.bind(s),t.clearTimeoutFn=n.bind(s)):(t.setTimeoutFn=setTimeout.bind(s),t.clearTimeoutFn=clearTimeout.bind(s))}var h=p;function p(t){if(t)return function(t){for(var e in p.prototype)t[e]=p.prototype[e];return t}(t)}p.prototype.on=p.prototype.addEventListener=function(t,e){return this._callbacks=this._callbacks||{},(this._callbacks["$"+t]=this._callbacks["$"+t]||[]).push(e),this},p.prototype.once=function(t,e){function s(){this.off(t,s),e.apply(this,arguments)}return s.fn=e,this.on(t,s),this},p.prototype.off=p.prototype.removeListener=p.prototype.removeAllListeners=p.prototype.removeEventListener=function(t,e){if(this._callbacks=this._callbacks||{},0==arguments.length)return this._callbacks={},this;var s,r=this._callbacks["$"+t];if(!r)return this;if(1==arguments.length)return delete this._callbacks["$"+t],this;for(var o=0;o<r.length;o++)if((s=r[o])===e||s.fn===e){r.splice(o,1);break}return 0===r.length&&delete this._callbacks["$"+t],this},p.prototype.emit=function(t){this._callbacks=this._callbacks||{};for(var e=new Array(arguments.length-1),s=this._callbacks["$"+t],r=1;r<arguments.length;r++)e[r-1]=arguments[r];if(s){r=0;for(var o=(s=s.slice(0)).length;r<o;++r)s[r].apply(this,e)}return this},p.prototype.emitReserved=p.prototype.emit,p.prototype.listeners=function(t){return this._callbacks=this._callbacks||{},this._callbacks["$"+t]||[]},p.prototype.hasListeners=function(t){return!!this.listeners(t).length};const c=Object.create(null);c.open="0",c.close="1",c.ping="2",c.pong="3",c.message="4",c.upgrade="5",c.noop="6";const u=Object.create(null);Object.keys(c).forEach((t=>{u[c[t]]=t}));const l={type:"error",data:"parser error"},d="function"==typeof Blob||"undefined"!=typeof Blob&&"[object BlobConstructor]"===Object.prototype.toString.call(Blob),f="function"==typeof ArrayBuffer,y=({type:t,data:e},s,r)=>{return d&&e instanceof Blob?s?r(e):m(e,r):f&&(e instanceof ArrayBuffer||(o=e,"function"==typeof ArrayBuffer.isView?ArrayBuffer.isView(o):o&&o.buffer instanceof ArrayBuffer))?s?r(e):m(new Blob([e]),r):r(c[t]+(e||""));var o},m=(t,e)=>{const s=new FileReader;return s.onload=function(){const t=s.result.split(",")[1];e("b"+t)},s.readAsDataURL(t)};for(var g="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",b="undefined"==typeof Uint8Array?[]:new Uint8Array(256),v=0;v<g.length;v++)b[g.charCodeAt(v)]=v;const w="function"==typeof ArrayBuffer,k=(t,e)=>{if("string"!=typeof t)return{type:"message",data:x(t,e)};const s=t.charAt(0);if("b"===s)return{type:"message",data:T(t.substring(1),e)};return u[s]?t.length>1?{type:u[s],data:t.substring(1)}:{type:u[s]}:l},T=(t,e)=>{if(w){const s=function(t){var e,s,r,o,i,n=.75*t.length,a=t.length,h=0;"="===t[t.length-1]&&(n--,"="===t[t.length-2]&&n--);var p=new ArrayBuffer(n),c=new Uint8Array(p);for(e=0;e<a;e+=4)s=b[t.charCodeAt(e)],r=b[t.charCodeAt(e+1)],o=b[t.charCodeAt(e+2)],i=b[t.charCodeAt(e+3)],c[h++]=s<<2|r>>4,c[h++]=(15&r)<<4|o>>2,c[h++]=(3&o)<<6|63&i;return p}(t);return x(s,e)}return{base64:!0,data:t}},x=(t,e)=>"blob"===e&&t instanceof ArrayBuffer?new Blob([t]):t,S=String.fromCharCode(30);class E extends 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attachEvent)attachEvent("onunload",F);else if("function"==typeof addEventListener){addEventListener("onpagehide"in s?"pagehide":"unload",F,!1)}function F(){for(let t in D.requests)D.requests.hasOwnProperty(t)&&D.requests[t].abort()}const I="function"==typeof Promise&&"function"==typeof Promise.resolve?t=>Promise.resolve().then(t):(t,e)=>e(t,0),M=s.WebSocket||s.MozWebSocket,W="undefined"!=typeof navigator&&"string"==typeof navigator.product&&"reactnative"===navigator.product.toLowerCase();class N extends E{constructor(t){super(t),this.supportsBinary=!t.forceBase64}get name(){return"websocket"}doOpen(){if(!this.check())return;const t=this.uri(),e=this.opts.protocols,s=W?{}:o(this.opts,"agent","perMessageDeflate","pfx","key","passphrase","cert","ca","ciphers","rejectUnauthorized","localAddress","protocolVersion","origin","maxPayload","family","checkServerIdentity");this.opts.extraHeaders&&(s.headers=this.opts.extraHeaders);try{this.ws=W?new M(t,e,s):e?new M(t,e):new M(t)}catch(t){return this.emit("error",t)}this.ws.binaryType=this.socket.binaryType||"arraybuffer",this.addEventListeners()}addEventListeners(){this.ws.onopen=()=>{this.opts.autoUnref&&this.ws._socket.unref(),this.onOpen()},this.ws.onclose=this.onClose.bind(this),this.ws.onmessage=t=>this.onData(t.data),this.ws.onerror=t=>this.onError("websocket error",t)}write(t){this.writable=!1;for(let e=0;e<t.length;e++){const s=t[e],r=e===t.length-1;y(s,this.supportsBinary,(t=>{try{this.ws.send(t)}catch(t){}r&&I((()=>{this.writable=!0,this.emit("drain")}),this.setTimeoutFn)}))}}doClose(){void 0!==this.ws&&(this.ws.close(),this.ws=null)}uri(){let t=this.query||{};const e=this.opts.secure?"wss":"ws";let s="";this.opts.port&&("wss"===e&&443!==Number(this.opts.port)||"ws"===e&&80!==Number(this.opts.port))&&(s=":"+this.opts.port),this.opts.timestampRequests&&(t[this.opts.timestampParam]=P()),this.supportsBinary||(t.b64=1);const r=U.encode(t);return e+"://"+(-1!==this.opts.hostname.indexOf(":")?"["+this.opts.hostname+"]":this.opts.hostname)+s+this.opts.path+(r.length?"?"+r:"")}check(){return!(!M||"__initialize"in M&&this.name===N.prototype.name)}}const X={websocket:N,polling:class extends H{constructor(t){if(super(t),"undefined"!=typeof location){const e="https:"===location.protocol;let s=location.port;s||(s=e?"443":"80"),this.xd="undefined"!=typeof location&&t.hostname!==location.hostname||s!==t.port,this.xs=t.secure!==e}const e=t&&t.forceBase64;this.supportsBinary=j&&!e}request(t={}){return Object.assign(t,{xd:this.xd,xs:this.xs},this.opts),new D(this.uri(),t)}doWrite(t,e){const s=this.request({method:"POST",data:t});s.on("success",e),s.on("error",(t=>{this.onError("xhr post error",t)}))}doPoll(){const t=this.request();t.on("data",this.onData.bind(this)),t.on("error",(t=>{this.onError("xhr poll error",t)})),this.pollXhr=t}}};var $=/^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/,z=["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"],V=function(t){var e=t,s=t.indexOf("["),r=t.indexOf("]");-1!=s&&-1!=r&&(t=t.substring(0,s)+t.substring(s,r).replace(/:/g,";")+t.substring(r,t.length));for(var o,i,n=$.exec(t||""),a={},h=14;h--;)a[z[h]]=n[h]||"";return-1!=s&&-1!=r&&(a.source=e,a.host=a.host.substring(1,a.host.length-1).replace(/;/g,":"),a.authority=a.authority.replace("[","").replace("]","").replace(/;/g,":"),a.ipv6uri=!0),a.pathNames=function(t,e){var s=/\/{2,9}/g,r=e.replace(s,"/").split("/");"/"!=e.substr(0,1)&&0!==e.length||r.splice(0,1);"/"==e.substr(e.length-1,1)&&r.splice(r.length-1,1);return r}(0,a.path),a.queryKey=(o=a.query,i={},o.replace(/(?:^|&)([^&=]*)=?([^&]*)/g,(function(t,e,s){e&&(i[e]=s)})),i),a};class G extends h{constructor(t,e={}){super(),t&&"object"==typeof t&&(e=t,t=null),t?(t=V(t),e.hostname=t.host,e.secure="https"===t.protocol||"wss"===t.protocol,e.port=t.port,t.query&&(e.query=t.query)):e.host&&(e.hostname=V(e.host).host),a(this,e),this.secure=null!=e.secure?e.secure:"undefined"!=typeof location&&"https:"===location.protocol,e.hostname&&!e.port&&(e.port=this.secure?"443":"80"),this.hostname=e.hostname||("undefined"!=typeof location?location.hostname:"localhost"),this.port=e.port||("undefined"!=typeof location&&location.port?location.port:this.secure?"443":"80"),this.transports=e.transports||["polling","websocket"],this.readyState="",this.writeBuffer=[],this.prevBufferLen=0,this.opts=Object.assign({path:"/engine.io",agent:!1,withCredentials:!1,upgrade:!0,timestampParam:"t",rememberUpgrade:!1,rejectUnauthorized:!0,perMessageDeflate:{threshold:1024},transportOptions:{},closeOnBeforeunload:!0},e),this.opts.path=this.opts.path.replace(/\/$/,"")+"/","string"==typeof this.opts.query&&(this.opts.query=U.decode(this.opts.query)),this.id=null,this.upgrades=null,this.pingInterval=null,this.pingTimeout=null,this.pingTimeoutTimer=null,"function"==typeof addEventListener&&(this.opts.closeOnBeforeunload&&addEventListener("beforeunload",(()=>{this.transport&&(this.transport.removeAllListeners(),this.transport.close())}),!1),"localhost"!==this.hostname&&(this.offlineEventListener=()=>{this.onClose("transport close")},addEventListener("offline",this.offlineEventListener,!1))),this.open()}createTransport(t){const e=function(t){const e={};for(let s in t)t.hasOwnProperty(s)&&(e[s]=t[s]);return e}(this.opts.query);e.EIO=4,e.transport=t,this.id&&(e.sid=this.id);const s=Object.assign({},this.opts.transportOptions[t],this.opts,{query:e,socket:this,hostname:this.hostname,secure:this.secure,port:this.port});return new X[t](s)}open(){let t;if(this.opts.rememberUpgrade&&G.priorWebsocketSuccess&&-1!==this.transports.indexOf("websocket"))t="websocket";else{if(0===this.transports.length)return void this.setTimeoutFn((()=>{this.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)}setTransport(t){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",(()=>{this.onClose("transport close")}))}probe(t){let e=this.createTransport(t),s=!1;G.priorWebsocketSuccess=!1;const r=()=>{s||(e.send([{type:"ping",data:"probe"}]),e.once("packet",(t=>{if(!s)if("pong"===t.type&&"probe"===t.data){if(this.upgrading=!0,this.emitReserved("upgrading",e),!e)return;G.priorWebsocketSuccess="websocket"===e.name,this.transport.pause((()=>{s||"closed"!==this.readyState&&(p(),this.setTransport(e),e.send([{type:"upgrade"}]),this.emitReserved("upgrade",e),e=null,this.upgrading=!1,this.flush())}))}else{const t=new Error("probe error");t.transport=e.name,this.emitReserved("upgradeError",t)}})))};function o(){s||(s=!0,p(),e.close(),e=null)}const i=t=>{const s=new Error("probe error: "+t);s.transport=e.name,o(),this.emitReserved("upgradeError",s)};function n(){i("transport closed")}function a(){i("socket closed")}function h(t){e&&t.name!==e.name&&o()}const p=()=>{e.removeListener("open",r),e.removeListener("error",i),e.removeListener("close",n),this.off("close",a),this.off("upgrading",h)};e.once("open",r),e.once("error",i),e.once("close",n),this.once("close",a),this.once("upgrading",h),e.open()}onOpen(){if(this.readyState="open",G.priorWebsocketSuccess="websocket"===this.transport.name,this.emitReserved("open"),this.flush(),"open"===this.readyState&&this.opts.upgrade&&this.transport.pause){let t=0;const e=this.upgrades.length;for(;t<e;t++)this.probe(this.upgrades[t])}}onPacket(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":const 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)}}onHandshake(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()}resetPingTimeout(){this.clearTimeoutFn(this.pingTimeoutTimer),this.pingTimeoutTimer=this.setTimeoutFn((()=>{this.onClose("ping timeout")}),this.pingInterval+this.pingTimeout),this.opts.autoUnref&&this.pingTimeoutTimer.unref()}onDrain(){this.writeBuffer.splice(0,this.prevBufferLen),this.prevBufferLen=0,0===this.writeBuffer.length?this.emitReserved("drain"):this.flush()}flush(){"closed"!==this.readyState&&this.transport.writable&&!this.upgrading&&this.writeBuffer.length&&(this.transport.send(this.writeBuffer),this.prevBufferLen=this.writeBuffer.length,this.emitReserved("flush"))}write(t,e,s){return this.sendPacket("message",t,e,s),this}send(t,e,s){return this.sendPacket("message",t,e,s),this}sendPacket(t,e,s,r){if("function"==typeof e&&(r=e,e=void 0),"function"==typeof s&&(r=s,s=null),"closing"===this.readyState||"closed"===this.readyState)return;(s=s||{}).compress=!1!==s.compress;const o={type:t,data:e,options:s};this.emitReserved("packetCreate",o),this.writeBuffer.push(o),r&&this.once("flush",r),this.flush()}close(){const t=()=>{this.onClose("forced close"),this.transport.close()},e=()=>{this.off("upgrade",e),this.off("upgradeError",e),t()},s=()=>{this.once("upgrade",e),this.once("upgradeError",e)};return"opening"!==this.readyState&&"open"!==this.readyState||(this.readyState="closing",this.writeBuffer.length?this.once("drain",(()=>{this.upgrading?s():t()})):this.upgrading?s():t()),this}onError(t){G.priorWebsocketSuccess=!1,this.emitReserved("error",t),this.onClose("transport error",t)}onClose(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)}filterUpgrades(t){const e=[];let s=0;const r=t.length;for(;s<r;s++)~this.transports.indexOf(t[s])&&e.push(t[s]);return e}}G.protocol=4;const J=G.protocol;export{G as Socket,E as Transport,a as installTimerFunctions,J as protocol,X as transports};
+//# sourceMappingURL=engine.io.esm.min.js.map
diff --git a/dist/engine.io.esm.min.js.map b/dist/engine.io.esm.min.js.map
new file mode 100644
index 000000000..6b4ca9762
--- /dev/null
+++ b/dist/engine.io.esm.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"engine.io.esm.min.js","sources":["../node_modules/has-cors/index.js","../build/esm/globalThis.browser.js","../build/esm/transports/xmlhttprequest.browser.js","../build/esm/util.js","../node_modules/@socket.io/component-emitter/index.js","../node_modules/engine.io-parser/build/esm/commons.js","../node_modules/engine.io-parser/build/esm/encodePacket.browser.js","../node_modules/base64-arraybuffer/dist/base64-arraybuffer.es5.js","../node_modules/engine.io-parser/build/esm/decodePacket.browser.js","../node_modules/engine.io-parser/build/esm/index.js","../build/esm/transport.js","../node_modules/yeast/index.js","../node_modules/parseqs/index.js","../build/esm/transports/polling.js","../build/esm/transports/polling-xhr.js","../build/esm/transports/websocket-constructor.browser.js","../build/esm/transports/websocket.js","../build/esm/transports/index.js","../node_modules/parseuri/index.js","../build/esm/socket.js","../build/esm/index.js"],"sourcesContent":["\n/**\n * Module exports.\n *\n * Logic borrowed from Modernizr:\n *\n *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js\n */\n\ntry {\n  module.exports = typeof XMLHttpRequest !== 'undefined' &&\n    'withCredentials' in new XMLHttpRequest();\n} catch (err) {\n  // if XMLHttp support is disabled in IE then it will throw\n  // when trying to create\n  module.exports = false;\n}\n","export default (() => {\n    if (typeof self !== \"undefined\") {\n        return self;\n    }\n    else if (typeof window !== \"undefined\") {\n        return window;\n    }\n    else {\n        return Function(\"return this\")();\n    }\n})();\n","// browser shim for xmlhttprequest module\nimport hasCORS from \"has-cors\";\nimport globalThis from \"../globalThis.js\";\nexport default function (opts) {\n    const xdomain = opts.xdomain;\n    // XMLHttpRequest can be disabled on IE\n    try {\n        if (\"undefined\" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {\n            return new XMLHttpRequest();\n        }\n    }\n    catch (e) { }\n    if (!xdomain) {\n        try {\n            return new globalThis[[\"Active\"].concat(\"Object\").join(\"X\")](\"Microsoft.XMLHTTP\");\n        }\n        catch (e) { }\n    }\n}\n","import globalThis from \"./globalThis.js\";\nexport function pick(obj, ...attr) {\n    return attr.reduce((acc, k) => {\n        if (obj.hasOwnProperty(k)) {\n            acc[k] = obj[k];\n        }\n        return acc;\n    }, {});\n}\n// Keep a reference to the real timeout functions so they can be used when overridden\nconst NATIVE_SET_TIMEOUT = setTimeout;\nconst NATIVE_CLEAR_TIMEOUT = clearTimeout;\nexport function installTimerFunctions(obj, opts) {\n    if (opts.useNativeTimers) {\n        obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);\n        obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);\n    }\n    else {\n        obj.setTimeoutFn = setTimeout.bind(globalThis);\n        obj.clearTimeoutFn = clearTimeout.bind(globalThis);\n    }\n}\n","\n/**\n * Expose `Emitter`.\n */\n\nexports.Emitter = Emitter;\n\n/**\n * Initialize a new `Emitter`.\n *\n * @api public\n */\n\nfunction Emitter(obj) {\n  if (obj) return mixin(obj);\n}\n\n/**\n * Mixin the emitter properties.\n *\n * @param {Object} obj\n * @return {Object}\n * @api private\n */\n\nfunction mixin(obj) {\n  for (var key in Emitter.prototype) {\n    obj[key] = Emitter.prototype[key];\n  }\n  return obj;\n}\n\n/**\n * Listen on the given `event` with `fn`.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.on =\nEmitter.prototype.addEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n  (this._callbacks['$' + event] = this._callbacks['$' + event] || [])\n    .push(fn);\n  return this;\n};\n\n/**\n * Adds an `event` listener that will be invoked a single\n * time then automatically removed.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.once = function(event, fn){\n  function on() {\n    this.off(event, on);\n    fn.apply(this, arguments);\n  }\n\n  on.fn = fn;\n  this.on(event, on);\n  return this;\n};\n\n/**\n * Remove the given callback for `event` or all\n * registered callbacks.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.off =\nEmitter.prototype.removeListener =\nEmitter.prototype.removeAllListeners =\nEmitter.prototype.removeEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n\n  // all\n  if (0 == arguments.length) {\n    this._callbacks = {};\n    return this;\n  }\n\n  // specific event\n  var callbacks = this._callbacks['$' + event];\n  if (!callbacks) return this;\n\n  // remove all handlers\n  if (1 == arguments.length) {\n    delete this._callbacks['$' + event];\n    return this;\n  }\n\n  // remove specific handler\n  var cb;\n  for (var i = 0; i < callbacks.length; i++) {\n    cb = callbacks[i];\n    if (cb === fn || cb.fn === fn) {\n      callbacks.splice(i, 1);\n      break;\n    }\n  }\n\n  // Remove event specific arrays for event types that no\n  // one is subscribed for to avoid memory leak.\n  if (callbacks.length === 0) {\n    delete this._callbacks['$' + event];\n  }\n\n  return this;\n};\n\n/**\n * Emit `event` with the given args.\n *\n * @param {String} event\n * @param {Mixed} ...\n * @return {Emitter}\n */\n\nEmitter.prototype.emit = function(event){\n  this._callbacks = this._callbacks || {};\n\n  var args = new Array(arguments.length - 1)\n    , callbacks = this._callbacks['$' + event];\n\n  for (var i = 1; i < arguments.length; i++) {\n    args[i - 1] = arguments[i];\n  }\n\n  if (callbacks) {\n    callbacks = callbacks.slice(0);\n    for (var i = 0, len = callbacks.length; i < len; ++i) {\n      callbacks[i].apply(this, args);\n    }\n  }\n\n  return this;\n};\n\n// alias used for reserved events (protected method)\nEmitter.prototype.emitReserved = Emitter.prototype.emit;\n\n/**\n * Return array of callbacks for `event`.\n *\n * @param {String} event\n * @return {Array}\n * @api public\n */\n\nEmitter.prototype.listeners = function(event){\n  this._callbacks = this._callbacks || {};\n  return this._callbacks['$' + event] || [];\n};\n\n/**\n * Check if this emitter has `event` handlers.\n *\n * @param {String} event\n * @return {Boolean}\n * @api public\n */\n\nEmitter.prototype.hasListeners = function(event){\n  return !! this.listeners(event).length;\n};\n","const PACKET_TYPES = Object.create(null); // no Map = no polyfill\nPACKET_TYPES[\"open\"] = \"0\";\nPACKET_TYPES[\"close\"] = \"1\";\nPACKET_TYPES[\"ping\"] = \"2\";\nPACKET_TYPES[\"pong\"] = \"3\";\nPACKET_TYPES[\"message\"] = \"4\";\nPACKET_TYPES[\"upgrade\"] = \"5\";\nPACKET_TYPES[\"noop\"] = \"6\";\nconst PACKET_TYPES_REVERSE = Object.create(null);\nObject.keys(PACKET_TYPES).forEach(key => {\n    PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;\n});\nconst ERROR_PACKET = { type: \"error\", data: \"parser error\" };\nexport { PACKET_TYPES, PACKET_TYPES_REVERSE, ERROR_PACKET };\n","import { PACKET_TYPES } from \"./commons.js\";\nconst withNativeBlob = typeof Blob === \"function\" ||\n    (typeof Blob !== \"undefined\" &&\n        Object.prototype.toString.call(Blob) === \"[object BlobConstructor]\");\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\n// ArrayBuffer.isView method is not defined in IE10\nconst isView = obj => {\n    return typeof ArrayBuffer.isView === \"function\"\n        ? ArrayBuffer.isView(obj)\n        : obj && obj.buffer instanceof ArrayBuffer;\n};\nconst encodePacket = ({ type, data }, supportsBinary, callback) => {\n    if (withNativeBlob && data instanceof Blob) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(data, callback);\n        }\n    }\n    else if (withNativeArrayBuffer &&\n        (data instanceof ArrayBuffer || isView(data))) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(new Blob([data]), callback);\n        }\n    }\n    // plain string\n    return callback(PACKET_TYPES[type] + (data || \"\"));\n};\nconst encodeBlobAsBase64 = (data, callback) => {\n    const fileReader = new FileReader();\n    fileReader.onload = function () {\n        const content = fileReader.result.split(\",\")[1];\n        callback(\"b\" + content);\n    };\n    return fileReader.readAsDataURL(data);\n};\nexport default encodePacket;\n","/*\n * base64-arraybuffer 1.0.1 <https://github.com/niklasvh/base64-arraybuffer>\n * Copyright (c) 2021 Niklas von Hertzen <https://hertzen.com>\n * Released under MIT License\n */\nvar chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';\n// Use a lookup table to find the index.\nvar lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);\nfor (var i = 0; i < chars.length; i++) {\n    lookup[chars.charCodeAt(i)] = i;\n}\nvar encode = function (arraybuffer) {\n    var bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';\n    for (i = 0; i < len; i += 3) {\n        base64 += chars[bytes[i] >> 2];\n        base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];\n        base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];\n        base64 += chars[bytes[i + 2] & 63];\n    }\n    if (len % 3 === 2) {\n        base64 = base64.substring(0, base64.length - 1) + '=';\n    }\n    else if (len % 3 === 1) {\n        base64 = base64.substring(0, base64.length - 2) + '==';\n    }\n    return base64;\n};\nvar decode = function (base64) {\n    var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;\n    if (base64[base64.length - 1] === '=') {\n        bufferLength--;\n        if (base64[base64.length - 2] === '=') {\n            bufferLength--;\n        }\n    }\n    var arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);\n    for (i = 0; i < len; i += 4) {\n        encoded1 = lookup[base64.charCodeAt(i)];\n        encoded2 = lookup[base64.charCodeAt(i + 1)];\n        encoded3 = lookup[base64.charCodeAt(i + 2)];\n        encoded4 = lookup[base64.charCodeAt(i + 3)];\n        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);\n        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);\n        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);\n    }\n    return arraybuffer;\n};\n\nexport { decode, encode };\n//# sourceMappingURL=base64-arraybuffer.es5.js.map\n","import { ERROR_PACKET, PACKET_TYPES_REVERSE } from \"./commons.js\";\nimport { decode } from \"base64-arraybuffer\";\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\nconst decodePacket = (encodedPacket, binaryType) => {\n    if (typeof encodedPacket !== \"string\") {\n        return {\n            type: \"message\",\n            data: mapBinary(encodedPacket, binaryType)\n        };\n    }\n    const type = encodedPacket.charAt(0);\n    if (type === \"b\") {\n        return {\n            type: \"message\",\n            data: decodeBase64Packet(encodedPacket.substring(1), binaryType)\n        };\n    }\n    const packetType = PACKET_TYPES_REVERSE[type];\n    if (!packetType) {\n        return ERROR_PACKET;\n    }\n    return encodedPacket.length > 1\n        ? {\n            type: PACKET_TYPES_REVERSE[type],\n            data: encodedPacket.substring(1)\n        }\n        : {\n            type: PACKET_TYPES_REVERSE[type]\n        };\n};\nconst decodeBase64Packet = (data, binaryType) => {\n    if (withNativeArrayBuffer) {\n        const decoded = decode(data);\n        return mapBinary(decoded, binaryType);\n    }\n    else {\n        return { base64: true, data }; // fallback for old browsers\n    }\n};\nconst mapBinary = (data, binaryType) => {\n    switch (binaryType) {\n        case \"blob\":\n            return data instanceof ArrayBuffer ? new Blob([data]) : data;\n        case \"arraybuffer\":\n        default:\n            return data; // assuming the data is already an ArrayBuffer\n    }\n};\nexport default decodePacket;\n","import encodePacket from \"./encodePacket.js\";\nimport decodePacket from \"./decodePacket.js\";\nconst SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text\nconst encodePayload = (packets, callback) => {\n    // some packets may be added to the array while encoding, so the initial length must be saved\n    const length = packets.length;\n    const encodedPackets = new Array(length);\n    let count = 0;\n    packets.forEach((packet, i) => {\n        // force base64 encoding for binary packets\n        encodePacket(packet, false, encodedPacket => {\n            encodedPackets[i] = encodedPacket;\n            if (++count === length) {\n                callback(encodedPackets.join(SEPARATOR));\n            }\n        });\n    });\n};\nconst decodePayload = (encodedPayload, binaryType) => {\n    const encodedPackets = encodedPayload.split(SEPARATOR);\n    const packets = [];\n    for (let i = 0; i < encodedPackets.length; i++) {\n        const decodedPacket = decodePacket(encodedPackets[i], binaryType);\n        packets.push(decodedPacket);\n        if (decodedPacket.type === \"error\") {\n            break;\n        }\n    }\n    return packets;\n};\nexport const protocol = 4;\nexport { encodePacket, encodePayload, decodePacket, decodePayload };\n","import { decodePacket } from \"engine.io-parser\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { installTimerFunctions } from \"./util.js\";\nexport class Transport extends Emitter {\n    /**\n     * Transport abstract constructor.\n     *\n     * @param {Object} options.\n     * @api private\n     */\n    constructor(opts) {\n        super();\n        this.writable = false;\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.query = opts.query;\n        this.readyState = \"\";\n        this.socket = opts.socket;\n    }\n    /**\n     * Emits an error.\n     *\n     * @param {String} str\n     * @return {Transport} for chaining\n     * @api protected\n     */\n    onError(msg, desc) {\n        const err = new Error(msg);\n        // @ts-ignore\n        err.type = \"TransportError\";\n        // @ts-ignore\n        err.description = desc;\n        super.emit(\"error\", err);\n        return this;\n    }\n    /**\n     * Opens the transport.\n     *\n     * @api public\n     */\n    open() {\n        if (\"closed\" === this.readyState || \"\" === this.readyState) {\n            this.readyState = \"opening\";\n            this.doOpen();\n        }\n        return this;\n    }\n    /**\n     * Closes the transport.\n     *\n     * @api public\n     */\n    close() {\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.doClose();\n            this.onClose();\n        }\n        return this;\n    }\n    /**\n     * Sends multiple packets.\n     *\n     * @param {Array} packets\n     * @api public\n     */\n    send(packets) {\n        if (\"open\" === this.readyState) {\n            this.write(packets);\n        }\n        else {\n            // this might happen if the transport was silently closed in the beforeunload event handler\n        }\n    }\n    /**\n     * Called upon open\n     *\n     * @api protected\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        this.writable = true;\n        super.emit(\"open\");\n    }\n    /**\n     * Called with data.\n     *\n     * @param {String} data\n     * @api protected\n     */\n    onData(data) {\n        const packet = decodePacket(data, this.socket.binaryType);\n        this.onPacket(packet);\n    }\n    /**\n     * Called with a decoded packet.\n     *\n     * @api protected\n     */\n    onPacket(packet) {\n        super.emit(\"packet\", packet);\n    }\n    /**\n     * Called upon close.\n     *\n     * @api protected\n     */\n    onClose() {\n        this.readyState = \"closed\";\n        super.emit(\"close\");\n    }\n}\n","'use strict';\n\nvar alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')\n  , length = 64\n  , map = {}\n  , seed = 0\n  , i = 0\n  , prev;\n\n/**\n * Return a string representing the specified number.\n *\n * @param {Number} num The number to convert.\n * @returns {String} The string representation of the number.\n * @api public\n */\nfunction encode(num) {\n  var encoded = '';\n\n  do {\n    encoded = alphabet[num % length] + encoded;\n    num = Math.floor(num / length);\n  } while (num > 0);\n\n  return encoded;\n}\n\n/**\n * Return the integer value specified by the given string.\n *\n * @param {String} str The string to convert.\n * @returns {Number} The integer value represented by the string.\n * @api public\n */\nfunction decode(str) {\n  var decoded = 0;\n\n  for (i = 0; i < str.length; i++) {\n    decoded = decoded * length + map[str.charAt(i)];\n  }\n\n  return decoded;\n}\n\n/**\n * Yeast: A tiny growing id generator.\n *\n * @returns {String} A unique id.\n * @api public\n */\nfunction yeast() {\n  var now = encode(+new Date());\n\n  if (now !== prev) return seed = 0, prev = now;\n  return now +'.'+ encode(seed++);\n}\n\n//\n// Map each character to its index.\n//\nfor (; i < length; i++) map[alphabet[i]] = i;\n\n//\n// Expose the `yeast`, `encode` and `decode` functions.\n//\nyeast.encode = encode;\nyeast.decode = decode;\nmodule.exports = yeast;\n","/**\n * Compiles a querystring\n * Returns string representation of the object\n *\n * @param {Object}\n * @api private\n */\n\nexports.encode = function (obj) {\n  var str = '';\n\n  for (var i in obj) {\n    if (obj.hasOwnProperty(i)) {\n      if (str.length) str += '&';\n      str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);\n    }\n  }\n\n  return str;\n};\n\n/**\n * Parses a simple querystring into an object\n *\n * @param {String} qs\n * @api private\n */\n\nexports.decode = function(qs){\n  var qry = {};\n  var pairs = qs.split('&');\n  for (var i = 0, l = pairs.length; i < l; i++) {\n    var pair = pairs[i].split('=');\n    qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);\n  }\n  return qry;\n};\n","import { Transport } from \"../transport.js\";\nimport yeast from \"yeast\";\nimport parseqs from \"parseqs\";\nimport { encodePayload, decodePayload } from \"engine.io-parser\";\nexport class Polling extends Transport {\n    constructor() {\n        super(...arguments);\n        this.polling = false;\n    }\n    /**\n     * Transport name.\n     */\n    get name() {\n        return \"polling\";\n    }\n    /**\n     * Opens the socket (triggers polling). We write a PING message to determine\n     * when the transport is open.\n     *\n     * @api private\n     */\n    doOpen() {\n        this.poll();\n    }\n    /**\n     * Pauses polling.\n     *\n     * @param {Function} callback upon buffers are flushed and transport is paused\n     * @api private\n     */\n    pause(onPause) {\n        this.readyState = \"pausing\";\n        const pause = () => {\n            this.readyState = \"paused\";\n            onPause();\n        };\n        if (this.polling || !this.writable) {\n            let total = 0;\n            if (this.polling) {\n                total++;\n                this.once(\"pollComplete\", function () {\n                    --total || pause();\n                });\n            }\n            if (!this.writable) {\n                total++;\n                this.once(\"drain\", function () {\n                    --total || pause();\n                });\n            }\n        }\n        else {\n            pause();\n        }\n    }\n    /**\n     * Starts polling cycle.\n     *\n     * @api public\n     */\n    poll() {\n        this.polling = true;\n        this.doPoll();\n        this.emit(\"poll\");\n    }\n    /**\n     * Overloads onData to detect payloads.\n     *\n     * @api private\n     */\n    onData(data) {\n        const callback = packet => {\n            // if its the first message we consider the transport open\n            if (\"opening\" === this.readyState && packet.type === \"open\") {\n                this.onOpen();\n            }\n            // if its a close packet, we close the ongoing requests\n            if (\"close\" === packet.type) {\n                this.onClose();\n                return false;\n            }\n            // otherwise bypass onData and handle the message\n            this.onPacket(packet);\n        };\n        // decode payload\n        decodePayload(data, this.socket.binaryType).forEach(callback);\n        // if an event did not trigger closing\n        if (\"closed\" !== this.readyState) {\n            // if we got data we're not polling\n            this.polling = false;\n            this.emit(\"pollComplete\");\n            if (\"open\" === this.readyState) {\n                this.poll();\n            }\n            else {\n            }\n        }\n    }\n    /**\n     * For polling, send a close packet.\n     *\n     * @api private\n     */\n    doClose() {\n        const close = () => {\n            this.write([{ type: \"close\" }]);\n        };\n        if (\"open\" === this.readyState) {\n            close();\n        }\n        else {\n            // in case we're trying to close while\n            // handshaking is in progress (GH-164)\n            this.once(\"open\", close);\n        }\n    }\n    /**\n     * Writes a packets payload.\n     *\n     * @param {Array} data packets\n     * @param {Function} drain callback\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        encodePayload(packets, data => {\n            this.doWrite(data, () => {\n                this.writable = true;\n                this.emit(\"drain\");\n            });\n        });\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"https\" : \"http\";\n        let port = \"\";\n        // cache busting is forced\n        if (false !== this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        if (!this.supportsBinary && !query.sid) {\n            query.b64 = 1;\n        }\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"https\" === schema && Number(this.opts.port) !== 443) ||\n                (\"http\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        const encodedQuery = parseqs.encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n}\n","/* global attachEvent */\nimport XMLHttpRequest from \"./xmlhttprequest.js\";\nimport globalThis from \"../globalThis.js\";\nimport { installTimerFunctions, pick } from \"../util.js\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { Polling } from \"./polling.js\";\n/**\n * Empty function\n */\nfunction empty() { }\nconst hasXHR2 = (function () {\n    const xhr = new XMLHttpRequest({\n        xdomain: false\n    });\n    return null != xhr.responseType;\n})();\nexport class XHR extends Polling {\n    /**\n     * XHR Polling constructor.\n     *\n     * @param {Object} opts\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        if (typeof location !== \"undefined\") {\n            const isSSL = \"https:\" === location.protocol;\n            let port = location.port;\n            // some user agents have empty `location.port`\n            if (!port) {\n                port = isSSL ? \"443\" : \"80\";\n            }\n            this.xd =\n                (typeof location !== \"undefined\" &&\n                    opts.hostname !== location.hostname) ||\n                    port !== opts.port;\n            this.xs = opts.secure !== isSSL;\n        }\n        /**\n         * XHR supports binary\n         */\n        const forceBase64 = opts && opts.forceBase64;\n        this.supportsBinary = hasXHR2 && !forceBase64;\n    }\n    /**\n     * Creates a request.\n     *\n     * @param {String} method\n     * @api private\n     */\n    request(opts = {}) {\n        Object.assign(opts, { xd: this.xd, xs: this.xs }, this.opts);\n        return new Request(this.uri(), opts);\n    }\n    /**\n     * Sends data.\n     *\n     * @param {String} data to send.\n     * @param {Function} called upon flush.\n     * @api private\n     */\n    doWrite(data, fn) {\n        const req = this.request({\n            method: \"POST\",\n            data: data\n        });\n        req.on(\"success\", fn);\n        req.on(\"error\", err => {\n            this.onError(\"xhr post error\", err);\n        });\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n    doPoll() {\n        const req = this.request();\n        req.on(\"data\", this.onData.bind(this));\n        req.on(\"error\", err => {\n            this.onError(\"xhr poll error\", err);\n        });\n        this.pollXhr = req;\n    }\n}\nexport class Request extends Emitter {\n    /**\n     * Request constructor\n     *\n     * @param {Object} options\n     * @api public\n     */\n    constructor(uri, opts) {\n        super();\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.method = opts.method || \"GET\";\n        this.uri = uri;\n        this.async = false !== opts.async;\n        this.data = undefined !== opts.data ? opts.data : null;\n        this.create();\n    }\n    /**\n     * Creates the XHR object and sends the request.\n     *\n     * @api private\n     */\n    create() {\n        const opts = pick(this.opts, \"agent\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"autoUnref\");\n        opts.xdomain = !!this.opts.xd;\n        opts.xscheme = !!this.opts.xs;\n        const xhr = (this.xhr = new XMLHttpRequest(opts));\n        try {\n            xhr.open(this.method, this.uri, this.async);\n            try {\n                if (this.opts.extraHeaders) {\n                    xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n                    for (let i in this.opts.extraHeaders) {\n                        if (this.opts.extraHeaders.hasOwnProperty(i)) {\n                            xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n                        }\n                    }\n                }\n            }\n            catch (e) { }\n            if (\"POST\" === this.method) {\n                try {\n                    xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n                }\n                catch (e) { }\n            }\n            try {\n                xhr.setRequestHeader(\"Accept\", \"*/*\");\n            }\n            catch (e) { }\n            // ie6 check\n            if (\"withCredentials\" in xhr) {\n                xhr.withCredentials = this.opts.withCredentials;\n            }\n            if (this.opts.requestTimeout) {\n                xhr.timeout = this.opts.requestTimeout;\n            }\n            xhr.onreadystatechange = () => {\n                if (4 !== xhr.readyState)\n                    return;\n                if (200 === xhr.status || 1223 === xhr.status) {\n                    this.onLoad();\n                }\n                else {\n                    // make sure the `error` event handler that's user-set\n                    // does not throw in the same tick and gets caught here\n                    this.setTimeoutFn(() => {\n                        this.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n                    }, 0);\n                }\n            };\n            xhr.send(this.data);\n        }\n        catch (e) {\n            // Need to defer since .create() is called directly from the constructor\n            // and thus the 'error' event can only be only bound *after* this exception\n            // occurs.  Therefore, also, we cannot throw here at all.\n            this.setTimeoutFn(() => {\n                this.onError(e);\n            }, 0);\n            return;\n        }\n        if (typeof document !== \"undefined\") {\n            this.index = Request.requestsCount++;\n            Request.requests[this.index] = this;\n        }\n    }\n    /**\n     * Called upon successful response.\n     *\n     * @api private\n     */\n    onSuccess() {\n        this.emit(\"success\");\n        this.cleanup();\n    }\n    /**\n     * Called if we have data.\n     *\n     * @api private\n     */\n    onData(data) {\n        this.emit(\"data\", data);\n        this.onSuccess();\n    }\n    /**\n     * Called upon error.\n     *\n     * @api private\n     */\n    onError(err) {\n        this.emit(\"error\", err);\n        this.cleanup(true);\n    }\n    /**\n     * Cleans up house.\n     *\n     * @api private\n     */\n    cleanup(fromError) {\n        if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n            return;\n        }\n        this.xhr.onreadystatechange = empty;\n        if (fromError) {\n            try {\n                this.xhr.abort();\n            }\n            catch (e) { }\n        }\n        if (typeof document !== \"undefined\") {\n            delete Request.requests[this.index];\n        }\n        this.xhr = null;\n    }\n    /**\n     * Called upon load.\n     *\n     * @api private\n     */\n    onLoad() {\n        const data = this.xhr.responseText;\n        if (data !== null) {\n            this.onData(data);\n        }\n    }\n    /**\n     * Aborts the request.\n     *\n     * @api public\n     */\n    abort() {\n        this.cleanup();\n    }\n}\nRequest.requestsCount = 0;\nRequest.requests = {};\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\nif (typeof document !== \"undefined\") {\n    // @ts-ignore\n    if (typeof attachEvent === \"function\") {\n        // @ts-ignore\n        attachEvent(\"onunload\", unloadHandler);\n    }\n    else if (typeof addEventListener === \"function\") {\n        const terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n        addEventListener(terminationEvent, unloadHandler, false);\n    }\n}\nfunction unloadHandler() {\n    for (let i in Request.requests) {\n        if (Request.requests.hasOwnProperty(i)) {\n            Request.requests[i].abort();\n        }\n    }\n}\n","import globalThis from \"../globalThis.js\";\nexport const nextTick = (() => {\n    const isPromiseAvailable = typeof Promise === \"function\" && typeof Promise.resolve === \"function\";\n    if (isPromiseAvailable) {\n        return cb => Promise.resolve().then(cb);\n    }\n    else {\n        return (cb, setTimeoutFn) => setTimeoutFn(cb, 0);\n    }\n})();\nexport const WebSocket = globalThis.WebSocket || globalThis.MozWebSocket;\nexport const usingBrowserWebSocket = true;\nexport const defaultBinaryType = \"arraybuffer\";\n","import { Transport } from \"../transport.js\";\nimport parseqs from \"parseqs\";\nimport yeast from \"yeast\";\nimport { pick } from \"../util.js\";\nimport { defaultBinaryType, nextTick, usingBrowserWebSocket, WebSocket } from \"./websocket-constructor.js\";\nimport { encodePacket } from \"engine.io-parser\";\n// detect ReactNative environment\nconst isReactNative = typeof navigator !== \"undefined\" &&\n    typeof navigator.product === \"string\" &&\n    navigator.product.toLowerCase() === \"reactnative\";\nexport class WS extends Transport {\n    /**\n     * WebSocket transport constructor.\n     *\n     * @api {Object} connection options\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        this.supportsBinary = !opts.forceBase64;\n    }\n    /**\n     * Transport name.\n     *\n     * @api public\n     */\n    get name() {\n        return \"websocket\";\n    }\n    /**\n     * Opens socket.\n     *\n     * @api private\n     */\n    doOpen() {\n        if (!this.check()) {\n            // let probe timeout\n            return;\n        }\n        const uri = this.uri();\n        const protocols = this.opts.protocols;\n        // React Native only supports the 'headers' option, and will print a warning if anything else is passed\n        const opts = isReactNative\n            ? {}\n            : pick(this.opts, \"agent\", \"perMessageDeflate\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"localAddress\", \"protocolVersion\", \"origin\", \"maxPayload\", \"family\", \"checkServerIdentity\");\n        if (this.opts.extraHeaders) {\n            opts.headers = this.opts.extraHeaders;\n        }\n        try {\n            this.ws =\n                usingBrowserWebSocket && !isReactNative\n                    ? protocols\n                        ? new WebSocket(uri, protocols)\n                        : new WebSocket(uri)\n                    : new WebSocket(uri, protocols, opts);\n        }\n        catch (err) {\n            return this.emit(\"error\", err);\n        }\n        this.ws.binaryType = this.socket.binaryType || defaultBinaryType;\n        this.addEventListeners();\n    }\n    /**\n     * Adds event listeners to the socket\n     *\n     * @api private\n     */\n    addEventListeners() {\n        this.ws.onopen = () => {\n            if (this.opts.autoUnref) {\n                this.ws._socket.unref();\n            }\n            this.onOpen();\n        };\n        this.ws.onclose = this.onClose.bind(this);\n        this.ws.onmessage = ev => this.onData(ev.data);\n        this.ws.onerror = e => this.onError(\"websocket error\", e);\n    }\n    /**\n     * Writes data to socket.\n     *\n     * @param {Array} array of packets.\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        // encodePacket efficient as it uses WS framing\n        // no need for encodePayload\n        for (let i = 0; i < packets.length; i++) {\n            const packet = packets[i];\n            const lastPacket = i === packets.length - 1;\n            encodePacket(packet, this.supportsBinary, data => {\n                // always create a new object (GH-437)\n                const opts = {};\n                if (!usingBrowserWebSocket) {\n                    if (packet.options) {\n                        opts.compress = packet.options.compress;\n                    }\n                    if (this.opts.perMessageDeflate) {\n                        const len = \"string\" === typeof data ? Buffer.byteLength(data) : data.length;\n                        if (len < this.opts.perMessageDeflate.threshold) {\n                            opts.compress = false;\n                        }\n                    }\n                }\n                // Sometimes the websocket has already been closed but the browser didn't\n                // have a chance of informing us about it yet, in that case send will\n                // throw an error\n                try {\n                    if (usingBrowserWebSocket) {\n                        // TypeError is thrown when passing the second argument on Safari\n                        this.ws.send(data);\n                    }\n                    else {\n                        this.ws.send(data, opts);\n                    }\n                }\n                catch (e) {\n                }\n                if (lastPacket) {\n                    // fake drain\n                    // defer to next tick to allow Socket to clear writeBuffer\n                    nextTick(() => {\n                        this.writable = true;\n                        this.emit(\"drain\");\n                    }, this.setTimeoutFn);\n                }\n            });\n        }\n    }\n    /**\n     * Closes socket.\n     *\n     * @api private\n     */\n    doClose() {\n        if (typeof this.ws !== \"undefined\") {\n            this.ws.close();\n            this.ws = null;\n        }\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"wss\" : \"ws\";\n        let port = \"\";\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"wss\" === schema && Number(this.opts.port) !== 443) ||\n                (\"ws\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        // append timestamp to URI\n        if (this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        // communicate binary support capabilities\n        if (!this.supportsBinary) {\n            query.b64 = 1;\n        }\n        const encodedQuery = parseqs.encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n    /**\n     * Feature detection for WebSocket.\n     *\n     * @return {Boolean} whether this transport is available.\n     * @api public\n     */\n    check() {\n        return (!!WebSocket &&\n            !(\"__initialize\" in WebSocket && this.name === WS.prototype.name));\n    }\n}\n","import { XHR } from \"./polling-xhr.js\";\nimport { WS } from \"./websocket.js\";\nexport const transports = {\n    websocket: WS,\n    polling: XHR\n};\n","/**\n * Parses an URI\n *\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\n * @api private\n */\n\nvar re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\n\nvar parts = [\n    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'\n];\n\nmodule.exports = function parseuri(str) {\n    var src = str,\n        b = str.indexOf('['),\n        e = str.indexOf(']');\n\n    if (b != -1 && e != -1) {\n        str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n    }\n\n    var m = re.exec(str || ''),\n        uri = {},\n        i = 14;\n\n    while (i--) {\n        uri[parts[i]] = m[i] || '';\n    }\n\n    if (b != -1 && e != -1) {\n        uri.source = src;\n        uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n        uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n        uri.ipv6uri = true;\n    }\n\n    uri.pathNames = pathNames(uri, uri['path']);\n    uri.queryKey = queryKey(uri, uri['query']);\n\n    return uri;\n};\n\nfunction pathNames(obj, path) {\n    var regx = /\\/{2,9}/g,\n        names = path.replace(regx, \"/\").split(\"/\");\n\n    if (path.substr(0, 1) == '/' || path.length === 0) {\n        names.splice(0, 1);\n    }\n    if (path.substr(path.length - 1, 1) == '/') {\n        names.splice(names.length - 1, 1);\n    }\n\n    return names;\n}\n\nfunction queryKey(uri, query) {\n    var data = {};\n\n    query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {\n        if ($1) {\n            data[$1] = $2;\n        }\n    });\n\n    return data;\n}\n","import { transports } from \"./transports/index.js\";\nimport { installTimerFunctions } from \"./util.js\";\nimport parseqs from \"parseqs\";\nimport parseuri from \"parseuri\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { protocol } from \"engine.io-parser\";\nexport class Socket extends Emitter {\n    /**\n     * Socket constructor.\n     *\n     * @param {String|Object} uri or options\n     * @param {Object} opts - options\n     * @api public\n     */\n    constructor(uri, opts = {}) {\n        super();\n        if (uri && \"object\" === typeof uri) {\n            opts = uri;\n            uri = null;\n        }\n        if (uri) {\n            uri = parseuri(uri);\n            opts.hostname = uri.host;\n            opts.secure = uri.protocol === \"https\" || uri.protocol === \"wss\";\n            opts.port = uri.port;\n            if (uri.query)\n                opts.query = uri.query;\n        }\n        else if (opts.host) {\n            opts.hostname = parseuri(opts.host).host;\n        }\n        installTimerFunctions(this, opts);\n        this.secure =\n            null != opts.secure\n                ? opts.secure\n                : typeof location !== \"undefined\" && \"https:\" === location.protocol;\n        if (opts.hostname && !opts.port) {\n            // if no port is specified manually, use the protocol default\n            opts.port = this.secure ? \"443\" : \"80\";\n        }\n        this.hostname =\n            opts.hostname ||\n                (typeof location !== \"undefined\" ? location.hostname : \"localhost\");\n        this.port =\n            opts.port ||\n                (typeof location !== \"undefined\" && location.port\n                    ? location.port\n                    : this.secure\n                        ? \"443\"\n                        : \"80\");\n        this.transports = opts.transports || [\"polling\", \"websocket\"];\n        this.readyState = \"\";\n        this.writeBuffer = [];\n        this.prevBufferLen = 0;\n        this.opts = Object.assign({\n            path: \"/engine.io\",\n            agent: false,\n            withCredentials: false,\n            upgrade: true,\n            timestampParam: \"t\",\n            rememberUpgrade: false,\n            rejectUnauthorized: true,\n            perMessageDeflate: {\n                threshold: 1024\n            },\n            transportOptions: {},\n            closeOnBeforeunload: true\n        }, opts);\n        this.opts.path = this.opts.path.replace(/\\/$/, \"\") + \"/\";\n        if (typeof this.opts.query === \"string\") {\n            this.opts.query = parseqs.decode(this.opts.query);\n        }\n        // set on handshake\n        this.id = null;\n        this.upgrades = null;\n        this.pingInterval = null;\n        this.pingTimeout = null;\n        // set on heartbeat\n        this.pingTimeoutTimer = null;\n        if (typeof addEventListener === \"function\") {\n            if (this.opts.closeOnBeforeunload) {\n                // Firefox closes the connection when the \"beforeunload\" event is emitted but not Chrome. This event listener\n                // ensures every browser behaves the same (no \"disconnect\" event at the Socket.IO level when the page is\n                // closed/reloaded)\n                addEventListener(\"beforeunload\", () => {\n                    if (this.transport) {\n                        // silently close the transport\n                        this.transport.removeAllListeners();\n                        this.transport.close();\n                    }\n                }, false);\n            }\n            if (this.hostname !== \"localhost\") {\n                this.offlineEventListener = () => {\n                    this.onClose(\"transport close\");\n                };\n                addEventListener(\"offline\", this.offlineEventListener, false);\n            }\n        }\n        this.open();\n    }\n    /**\n     * Creates transport of the given type.\n     *\n     * @param {String} transport name\n     * @return {Transport}\n     * @api private\n     */\n    createTransport(name) {\n        const query = clone(this.opts.query);\n        // append engine.io protocol identifier\n        query.EIO = protocol;\n        // transport name\n        query.transport = name;\n        // session id if we already have one\n        if (this.id)\n            query.sid = this.id;\n        const opts = Object.assign({}, this.opts.transportOptions[name], this.opts, {\n            query,\n            socket: this,\n            hostname: this.hostname,\n            secure: this.secure,\n            port: this.port\n        });\n        return new transports[name](opts);\n    }\n    /**\n     * Initializes transport to use and starts probe.\n     *\n     * @api private\n     */\n    open() {\n        let transport;\n        if (this.opts.rememberUpgrade &&\n            Socket.priorWebsocketSuccess &&\n            this.transports.indexOf(\"websocket\") !== -1) {\n            transport = \"websocket\";\n        }\n        else if (0 === this.transports.length) {\n            // Emit error on next tick so it can be listened to\n            this.setTimeoutFn(() => {\n                this.emitReserved(\"error\", \"No transports available\");\n            }, 0);\n            return;\n        }\n        else {\n            transport = this.transports[0];\n        }\n        this.readyState = \"opening\";\n        // Retry with the next transport if the transport is disabled (jsonp: false)\n        try {\n            transport = this.createTransport(transport);\n        }\n        catch (e) {\n            this.transports.shift();\n            this.open();\n            return;\n        }\n        transport.open();\n        this.setTransport(transport);\n    }\n    /**\n     * Sets the current transport. Disables the existing one (if any).\n     *\n     * @api private\n     */\n    setTransport(transport) {\n        if (this.transport) {\n            this.transport.removeAllListeners();\n        }\n        // set up transport\n        this.transport = transport;\n        // set up transport listeners\n        transport\n            .on(\"drain\", this.onDrain.bind(this))\n            .on(\"packet\", this.onPacket.bind(this))\n            .on(\"error\", this.onError.bind(this))\n            .on(\"close\", () => {\n            this.onClose(\"transport close\");\n        });\n    }\n    /**\n     * Probes a transport.\n     *\n     * @param {String} transport name\n     * @api private\n     */\n    probe(name) {\n        let transport = this.createTransport(name);\n        let failed = false;\n        Socket.priorWebsocketSuccess = false;\n        const onTransportOpen = () => {\n            if (failed)\n                return;\n            transport.send([{ type: \"ping\", data: \"probe\" }]);\n            transport.once(\"packet\", msg => {\n                if (failed)\n                    return;\n                if (\"pong\" === msg.type && \"probe\" === msg.data) {\n                    this.upgrading = true;\n                    this.emitReserved(\"upgrading\", transport);\n                    if (!transport)\n                        return;\n                    Socket.priorWebsocketSuccess = \"websocket\" === transport.name;\n                    this.transport.pause(() => {\n                        if (failed)\n                            return;\n                        if (\"closed\" === this.readyState)\n                            return;\n                        cleanup();\n                        this.setTransport(transport);\n                        transport.send([{ type: \"upgrade\" }]);\n                        this.emitReserved(\"upgrade\", transport);\n                        transport = null;\n                        this.upgrading = false;\n                        this.flush();\n                    });\n                }\n                else {\n                    const err = new Error(\"probe error\");\n                    // @ts-ignore\n                    err.transport = transport.name;\n                    this.emitReserved(\"upgradeError\", err);\n                }\n            });\n        };\n        function freezeTransport() {\n            if (failed)\n                return;\n            // Any callback called by transport should be ignored since now\n            failed = true;\n            cleanup();\n            transport.close();\n            transport = null;\n        }\n        // Handle any error that happens while probing\n        const onerror = err => {\n            const error = new Error(\"probe error: \" + err);\n            // @ts-ignore\n            error.transport = transport.name;\n            freezeTransport();\n            this.emitReserved(\"upgradeError\", error);\n        };\n        function onTransportClose() {\n            onerror(\"transport closed\");\n        }\n        // When the socket is closed while we're probing\n        function onclose() {\n            onerror(\"socket closed\");\n        }\n        // When the socket is upgraded while we're probing\n        function onupgrade(to) {\n            if (transport && to.name !== transport.name) {\n                freezeTransport();\n            }\n        }\n        // Remove all listeners on the transport and on self\n        const cleanup = () => {\n            transport.removeListener(\"open\", onTransportOpen);\n            transport.removeListener(\"error\", onerror);\n            transport.removeListener(\"close\", onTransportClose);\n            this.off(\"close\", onclose);\n            this.off(\"upgrading\", onupgrade);\n        };\n        transport.once(\"open\", onTransportOpen);\n        transport.once(\"error\", onerror);\n        transport.once(\"close\", onTransportClose);\n        this.once(\"close\", onclose);\n        this.once(\"upgrading\", onupgrade);\n        transport.open();\n    }\n    /**\n     * Called when connection is deemed open.\n     *\n     * @api private\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        Socket.priorWebsocketSuccess = \"websocket\" === this.transport.name;\n        this.emitReserved(\"open\");\n        this.flush();\n        // we check for `readyState` in case an `open`\n        // listener already closed the socket\n        if (\"open\" === this.readyState &&\n            this.opts.upgrade &&\n            this.transport.pause) {\n            let i = 0;\n            const l = this.upgrades.length;\n            for (; i < l; i++) {\n                this.probe(this.upgrades[i]);\n            }\n        }\n    }\n    /**\n     * Handles a packet.\n     *\n     * @api private\n     */\n    onPacket(packet) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            this.emitReserved(\"packet\", packet);\n            // Socket is live - any packet counts\n            this.emitReserved(\"heartbeat\");\n            switch (packet.type) {\n                case \"open\":\n                    this.onHandshake(JSON.parse(packet.data));\n                    break;\n                case \"ping\":\n                    this.resetPingTimeout();\n                    this.sendPacket(\"pong\");\n                    this.emitReserved(\"ping\");\n                    this.emitReserved(\"pong\");\n                    break;\n                case \"error\":\n                    const err = new Error(\"server error\");\n                    // @ts-ignore\n                    err.code = packet.data;\n                    this.onError(err);\n                    break;\n                case \"message\":\n                    this.emitReserved(\"data\", packet.data);\n                    this.emitReserved(\"message\", packet.data);\n                    break;\n            }\n        }\n        else {\n        }\n    }\n    /**\n     * Called upon handshake completion.\n     *\n     * @param {Object} data - handshake obj\n     * @api private\n     */\n    onHandshake(data) {\n        this.emitReserved(\"handshake\", data);\n        this.id = data.sid;\n        this.transport.query.sid = data.sid;\n        this.upgrades = this.filterUpgrades(data.upgrades);\n        this.pingInterval = data.pingInterval;\n        this.pingTimeout = data.pingTimeout;\n        this.onOpen();\n        // In case open handler closes socket\n        if (\"closed\" === this.readyState)\n            return;\n        this.resetPingTimeout();\n    }\n    /**\n     * Sets and resets ping timeout timer based on server pings.\n     *\n     * @api private\n     */\n    resetPingTimeout() {\n        this.clearTimeoutFn(this.pingTimeoutTimer);\n        this.pingTimeoutTimer = this.setTimeoutFn(() => {\n            this.onClose(\"ping timeout\");\n        }, this.pingInterval + this.pingTimeout);\n        if (this.opts.autoUnref) {\n            this.pingTimeoutTimer.unref();\n        }\n    }\n    /**\n     * Called on `drain` event\n     *\n     * @api private\n     */\n    onDrain() {\n        this.writeBuffer.splice(0, this.prevBufferLen);\n        // setting prevBufferLen = 0 is very important\n        // for example, when upgrading, upgrade packet is sent over,\n        // and a nonzero prevBufferLen could cause problems on `drain`\n        this.prevBufferLen = 0;\n        if (0 === this.writeBuffer.length) {\n            this.emitReserved(\"drain\");\n        }\n        else {\n            this.flush();\n        }\n    }\n    /**\n     * Flush write buffers.\n     *\n     * @api private\n     */\n    flush() {\n        if (\"closed\" !== this.readyState &&\n            this.transport.writable &&\n            !this.upgrading &&\n            this.writeBuffer.length) {\n            this.transport.send(this.writeBuffer);\n            // keep track of current length of writeBuffer\n            // splice writeBuffer and callbackBuffer on `drain`\n            this.prevBufferLen = this.writeBuffer.length;\n            this.emitReserved(\"flush\");\n        }\n    }\n    /**\n     * Sends a message.\n     *\n     * @param {String} message.\n     * @param {Function} callback function.\n     * @param {Object} options.\n     * @return {Socket} for chaining.\n     * @api public\n     */\n    write(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    send(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    /**\n     * Sends a packet.\n     *\n     * @param {String} packet type.\n     * @param {String} data.\n     * @param {Object} options.\n     * @param {Function} callback function.\n     * @api private\n     */\n    sendPacket(type, data, options, fn) {\n        if (\"function\" === typeof data) {\n            fn = data;\n            data = undefined;\n        }\n        if (\"function\" === typeof options) {\n            fn = options;\n            options = null;\n        }\n        if (\"closing\" === this.readyState || \"closed\" === this.readyState) {\n            return;\n        }\n        options = options || {};\n        options.compress = false !== options.compress;\n        const packet = {\n            type: type,\n            data: data,\n            options: options\n        };\n        this.emitReserved(\"packetCreate\", packet);\n        this.writeBuffer.push(packet);\n        if (fn)\n            this.once(\"flush\", fn);\n        this.flush();\n    }\n    /**\n     * Closes the connection.\n     *\n     * @api public\n     */\n    close() {\n        const close = () => {\n            this.onClose(\"forced close\");\n            this.transport.close();\n        };\n        const cleanupAndClose = () => {\n            this.off(\"upgrade\", cleanupAndClose);\n            this.off(\"upgradeError\", cleanupAndClose);\n            close();\n        };\n        const waitForUpgrade = () => {\n            // wait for upgrade to finish since we can't send packets while pausing a transport\n            this.once(\"upgrade\", cleanupAndClose);\n            this.once(\"upgradeError\", cleanupAndClose);\n        };\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.readyState = \"closing\";\n            if (this.writeBuffer.length) {\n                this.once(\"drain\", () => {\n                    if (this.upgrading) {\n                        waitForUpgrade();\n                    }\n                    else {\n                        close();\n                    }\n                });\n            }\n            else if (this.upgrading) {\n                waitForUpgrade();\n            }\n            else {\n                close();\n            }\n        }\n        return this;\n    }\n    /**\n     * Called upon transport error\n     *\n     * @api private\n     */\n    onError(err) {\n        Socket.priorWebsocketSuccess = false;\n        this.emitReserved(\"error\", err);\n        this.onClose(\"transport error\", err);\n    }\n    /**\n     * Called upon transport close.\n     *\n     * @api private\n     */\n    onClose(reason, desc) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            // clear timers\n            this.clearTimeoutFn(this.pingTimeoutTimer);\n            // stop event from firing again for transport\n            this.transport.removeAllListeners(\"close\");\n            // ensure transport won't stay open\n            this.transport.close();\n            // ignore further transport communication\n            this.transport.removeAllListeners();\n            if (typeof removeEventListener === \"function\") {\n      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\ No newline at end of file
diff --git a/dist/engine.io.js b/dist/engine.io.js
index 356c30a4e..203ab2921 100644
--- a/dist/engine.io.js
+++ b/dist/engine.io.js
@@ -1,381 +1,2384 @@
 /*!
- * Engine.IO v5.1.2
+ * Engine.IO v6.1.1
  * (c) 2014-2021 Guillermo Rauch
  * Released under the MIT License.
  */
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-		exports["eio"] = factory();
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-/***/ "./lib/globalThis.browser.js":
-/*!***********************************!*\
-  !*** ./lib/globalThis.browser.js ***!
-  \***********************************/
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-/***/ (function(module, exports) {
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-eval("module.exports = function () {\n  if (typeof self !== \"undefined\") {\n    return self;\n  } else if (typeof window !== \"undefined\") {\n    return window;\n  } else {\n    return Function(\"return this\")();\n  }\n}();\n\n//# sourceURL=webpack://eio/./lib/globalThis.browser.js?");
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-/***/ }),
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-/***/ "./lib/index.js":
-/*!**********************!*\
-  !*** ./lib/index.js ***!
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-/***/ (function(module, exports, __webpack_require__) {
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-eval("var Socket = __webpack_require__(/*! ./socket */ \"./lib/socket.js\");\n\nmodule.exports = function (uri, opts) {\n  return new Socket(uri, opts);\n};\n/**\n * Expose deps for legacy compatibility\n * and standalone browser access.\n */\n\n\nmodule.exports.Socket = Socket;\nmodule.exports.protocol = Socket.protocol; // this is an int\n\nmodule.exports.Transport = __webpack_require__(/*! ./transport */ \"./lib/transport.js\");\nmodule.exports.transports = __webpack_require__(/*! ./transports/index */ \"./lib/transports/index.js\");\nmodule.exports.parser = __webpack_require__(/*! engine.io-parser */ \"./node_modules/engine.io-parser/lib/index.js\");\n\n//# sourceURL=webpack://eio/./lib/index.js?");
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-/***/ }),
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-/***/ "./lib/socket.js":
-/*!***********************!*\
-  !*** ./lib/socket.js ***!
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-/***/ (function(module, exports, __webpack_require__) {
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-eval("function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nfunction _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function\"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\nfunction _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }\n\nfunction _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) { return call; } return _assertThisInitialized(self); }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _isNativeReflectConstruct() { if (typeof Reflect === \"undefined\" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === \"function\") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }\n\nfunction _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\nvar transports = __webpack_require__(/*! ./transports/index */ \"./lib/transports/index.js\");\n\nvar Emitter = __webpack_require__(/*! component-emitter */ \"./node_modules/component-emitter/index.js\");\n\nvar debug = __webpack_require__(/*! debug */ \"./node_modules/debug/src/browser.js\")(\"engine.io-client:socket\");\n\nvar parser = __webpack_require__(/*! engine.io-parser */ \"./node_modules/engine.io-parser/lib/index.js\");\n\nvar parseuri = __webpack_require__(/*! parseuri */ \"./node_modules/parseuri/index.js\");\n\nvar parseqs = __webpack_require__(/*! parseqs */ \"./node_modules/parseqs/index.js\");\n\nvar Socket = /*#__PURE__*/function (_Emitter) {\n  _inherits(Socket, _Emitter);\n\n  var _super = _createSuper(Socket);\n\n  /**\n   * Socket constructor.\n   *\n   * @param {String|Object} uri or options\n   * @param {Object} options\n   * @api public\n   */\n  function Socket(uri) {\n    var _this;\n\n    var opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n\n    _classCallCheck(this, Socket);\n\n    _this = _super.call(this);\n\n    if (uri && \"object\" === _typeof(uri)) {\n      opts = uri;\n      uri = null;\n    }\n\n    if (uri) {\n      uri = parseuri(uri);\n      opts.hostname = uri.host;\n      opts.secure = uri.protocol === \"https\" || uri.protocol === \"wss\";\n      opts.port = uri.port;\n      if (uri.query) opts.query = uri.query;\n    } else if (opts.host) {\n      opts.hostname = parseuri(opts.host).host;\n    }\n\n    _this.secure = null != opts.secure ? opts.secure : typeof location !== \"undefined\" && \"https:\" === location.protocol;\n\n    if (opts.hostname && !opts.port) {\n      // if no port is specified manually, use the protocol default\n      opts.port = _this.secure ? \"443\" : \"80\";\n    }\n\n    _this.hostname = opts.hostname || (typeof location !== \"undefined\" ? location.hostname : \"localhost\");\n    _this.port = opts.port || (typeof location !== \"undefined\" && location.port ? location.port : _this.secure ? 443 : 80);\n    _this.transports = opts.transports || [\"polling\", \"websocket\"];\n    _this.readyState = \"\";\n    _this.writeBuffer = [];\n    _this.prevBufferLen = 0;\n    _this.opts = _extends({\n      path: \"/engine.io\",\n      agent: false,\n      withCredentials: false,\n      upgrade: true,\n      jsonp: true,\n      timestampParam: \"t\",\n      rememberUpgrade: false,\n      rejectUnauthorized: true,\n      perMessageDeflate: {\n        threshold: 1024\n      },\n      transportOptions: {},\n      closeOnBeforeunload: true\n    }, opts);\n    _this.opts.path = _this.opts.path.replace(/\\/$/, \"\") + \"/\";\n\n    if (typeof _this.opts.query === \"string\") {\n      _this.opts.query = parseqs.decode(_this.opts.query);\n    } // set on handshake\n\n\n    _this.id = null;\n    _this.upgrades = null;\n    _this.pingInterval = null;\n    _this.pingTimeout = null; // set on heartbeat\n\n    _this.pingTimeoutTimer = null;\n\n    if (typeof addEventListener === \"function\") {\n      if (_this.opts.closeOnBeforeunload) {\n        // Firefox closes the connection when the \"beforeunload\" event is emitted but not Chrome. This event listener\n        // ensures every browser behaves the same (no \"disconnect\" event at the Socket.IO level when the page is\n        // closed/reloaded)\n        addEventListener(\"beforeunload\", function () {\n          if (_this.transport) {\n            // silently close the transport\n            _this.transport.removeAllListeners();\n\n            _this.transport.close();\n          }\n        }, false);\n      }\n\n      if (_this.hostname !== \"localhost\") {\n        _this.offlineEventListener = function () {\n          _this.onClose(\"transport close\");\n        };\n\n        addEventListener(\"offline\", _this.offlineEventListener, false);\n      }\n    }\n\n    _this.open();\n\n    return _this;\n  }\n  /**\n   * Creates transport of the given type.\n   *\n   * @param {String} transport name\n   * @return {Transport}\n   * @api private\n   */\n\n\n  _createClass(Socket, [{\n    key: \"createTransport\",\n    value: function createTransport(name) {\n      debug('creating transport \"%s\"', name);\n      var query = clone(this.opts.query); // append engine.io protocol identifier\n\n      query.EIO = parser.protocol; // transport name\n\n      query.transport = name; // session id if we already have one\n\n      if (this.id) query.sid = this.id;\n\n      var opts = _extends({}, this.opts.transportOptions[name], this.opts, {\n        query: query,\n        socket: this,\n        hostname: this.hostname,\n        secure: this.secure,\n        port: this.port\n      });\n\n      debug(\"options: %j\", opts);\n      return new transports[name](opts);\n    }\n    /**\n     * Initializes transport to use and starts probe.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"open\",\n    value: function open() {\n      var _this2 = this;\n\n      var transport;\n\n      if (this.opts.rememberUpgrade && Socket.priorWebsocketSuccess && this.transports.indexOf(\"websocket\") !== -1) {\n        transport = \"websocket\";\n      } else if (0 === this.transports.length) {\n        // Emit error on next tick so it can be listened to\n        setTimeout(function () {\n          _this2.emit(\"error\", \"No transports available\");\n        }, 0);\n        return;\n      } else {\n        transport = this.transports[0];\n      }\n\n      this.readyState = \"opening\"; // Retry with the next transport if the transport is disabled (jsonp: false)\n\n      try {\n        transport = this.createTransport(transport);\n      } catch (e) {\n        debug(\"error while creating transport: %s\", e);\n        this.transports.shift();\n        this.open();\n        return;\n      }\n\n      transport.open();\n      this.setTransport(transport);\n    }\n    /**\n     * Sets the current transport. Disables the existing one (if any).\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"setTransport\",\n    value: function setTransport(transport) {\n      var _this3 = this;\n\n      debug(\"setting transport %s\", transport.name);\n\n      if (this.transport) {\n        debug(\"clearing existing transport %s\", this.transport.name);\n        this.transport.removeAllListeners();\n      } // set up transport\n\n\n      this.transport = transport; // set up transport listeners\n\n      transport.on(\"drain\", this.onDrain.bind(this)).on(\"packet\", this.onPacket.bind(this)).on(\"error\", this.onError.bind(this)).on(\"close\", function () {\n        _this3.onClose(\"transport close\");\n      });\n    }\n    /**\n     * Probes a transport.\n     *\n     * @param {String} transport name\n     * @api private\n     */\n\n  }, {\n    key: \"probe\",\n    value: function probe(name) {\n      var _this4 = this;\n\n      debug('probing transport \"%s\"', name);\n      var transport = this.createTransport(name, {\n        probe: 1\n      });\n      var failed = false;\n      Socket.priorWebsocketSuccess = false;\n\n      var onTransportOpen = function onTransportOpen() {\n        if (failed) return;\n        debug('probe transport \"%s\" opened', name);\n        transport.send([{\n          type: \"ping\",\n          data: \"probe\"\n        }]);\n        transport.once(\"packet\", function (msg) {\n          if (failed) return;\n\n          if (\"pong\" === msg.type && \"probe\" === msg.data) {\n            debug('probe transport \"%s\" pong', name);\n            _this4.upgrading = true;\n\n            _this4.emit(\"upgrading\", transport);\n\n            if (!transport) return;\n            Socket.priorWebsocketSuccess = \"websocket\" === transport.name;\n            debug('pausing current transport \"%s\"', _this4.transport.name);\n\n            _this4.transport.pause(function () {\n              if (failed) return;\n              if (\"closed\" === _this4.readyState) return;\n              debug(\"changing transport and sending upgrade packet\");\n              cleanup();\n\n              _this4.setTransport(transport);\n\n              transport.send([{\n                type: \"upgrade\"\n              }]);\n\n              _this4.emit(\"upgrade\", transport);\n\n              transport = null;\n              _this4.upgrading = false;\n\n              _this4.flush();\n            });\n          } else {\n            debug('probe transport \"%s\" failed', name);\n            var err = new Error(\"probe error\");\n            err.transport = transport.name;\n\n            _this4.emit(\"upgradeError\", err);\n          }\n        });\n      };\n\n      function freezeTransport() {\n        if (failed) return; // Any callback called by transport should be ignored since now\n\n        failed = true;\n        cleanup();\n        transport.close();\n        transport = null;\n      } // Handle any error that happens while probing\n\n\n      var onerror = function onerror(err) {\n        var error = new Error(\"probe error: \" + err);\n        error.transport = transport.name;\n        freezeTransport();\n        debug('probe transport \"%s\" failed because of error: %s', name, err);\n\n        _this4.emit(\"upgradeError\", error);\n      };\n\n      function onTransportClose() {\n        onerror(\"transport closed\");\n      } // When the socket is closed while we're probing\n\n\n      function onclose() {\n        onerror(\"socket closed\");\n      } // When the socket is upgraded while we're probing\n\n\n      function onupgrade(to) {\n        if (transport && to.name !== transport.name) {\n          debug('\"%s\" works - aborting \"%s\"', to.name, transport.name);\n          freezeTransport();\n        }\n      } // Remove all listeners on the transport and on self\n\n\n      var cleanup = function cleanup() {\n        transport.removeListener(\"open\", onTransportOpen);\n        transport.removeListener(\"error\", onerror);\n        transport.removeListener(\"close\", onTransportClose);\n\n        _this4.removeListener(\"close\", onclose);\n\n        _this4.removeListener(\"upgrading\", onupgrade);\n      };\n\n      transport.once(\"open\", onTransportOpen);\n      transport.once(\"error\", onerror);\n      transport.once(\"close\", onTransportClose);\n      this.once(\"close\", onclose);\n      this.once(\"upgrading\", onupgrade);\n      transport.open();\n    }\n    /**\n     * Called when connection is deemed open.\n     *\n     * @api public\n     */\n\n  }, {\n    key: \"onOpen\",\n    value: function onOpen() {\n      debug(\"socket open\");\n      this.readyState = \"open\";\n      Socket.priorWebsocketSuccess = \"websocket\" === this.transport.name;\n      this.emit(\"open\");\n      this.flush(); // we check for `readyState` in case an `open`\n      // listener already closed the socket\n\n      if (\"open\" === this.readyState && this.opts.upgrade && this.transport.pause) {\n        debug(\"starting upgrade probes\");\n        var i = 0;\n        var l = this.upgrades.length;\n\n        for (; i < l; i++) {\n          this.probe(this.upgrades[i]);\n        }\n      }\n    }\n    /**\n     * Handles a packet.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onPacket\",\n    value: function onPacket(packet) {\n      if (\"opening\" === this.readyState || \"open\" === this.readyState || \"closing\" === this.readyState) {\n        debug('socket receive: type \"%s\", data \"%s\"', packet.type, packet.data);\n        this.emit(\"packet\", packet); // Socket is live - any packet counts\n\n        this.emit(\"heartbeat\");\n\n        switch (packet.type) {\n          case \"open\":\n            this.onHandshake(JSON.parse(packet.data));\n            break;\n\n          case \"ping\":\n            this.resetPingTimeout();\n            this.sendPacket(\"pong\");\n            this.emit(\"ping\");\n            this.emit(\"pong\");\n            break;\n\n          case \"error\":\n            var err = new Error(\"server error\");\n            err.code = packet.data;\n            this.onError(err);\n            break;\n\n          case \"message\":\n            this.emit(\"data\", packet.data);\n            this.emit(\"message\", packet.data);\n            break;\n        }\n      } else {\n        debug('packet received with socket readyState \"%s\"', this.readyState);\n      }\n    }\n    /**\n     * Called upon handshake completion.\n     *\n     * @param {Object} handshake obj\n     * @api private\n     */\n\n  }, {\n    key: \"onHandshake\",\n    value: function onHandshake(data) {\n      this.emit(\"handshake\", data);\n      this.id = data.sid;\n      this.transport.query.sid = data.sid;\n      this.upgrades = this.filterUpgrades(data.upgrades);\n      this.pingInterval = data.pingInterval;\n      this.pingTimeout = data.pingTimeout;\n      this.onOpen(); // In case open handler closes socket\n\n      if (\"closed\" === this.readyState) return;\n      this.resetPingTimeout();\n    }\n    /**\n     * Sets and resets ping timeout timer based on server pings.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"resetPingTimeout\",\n    value: function resetPingTimeout() {\n      var _this5 = this;\n\n      clearTimeout(this.pingTimeoutTimer);\n      this.pingTimeoutTimer = setTimeout(function () {\n        _this5.onClose(\"ping timeout\");\n      }, this.pingInterval + this.pingTimeout);\n\n      if (this.opts.autoUnref) {\n        this.pingTimeoutTimer.unref();\n      }\n    }\n    /**\n     * Called on `drain` event\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onDrain\",\n    value: function onDrain() {\n      this.writeBuffer.splice(0, this.prevBufferLen); // setting prevBufferLen = 0 is very important\n      // for example, when upgrading, upgrade packet is sent over,\n      // and a nonzero prevBufferLen could cause problems on `drain`\n\n      this.prevBufferLen = 0;\n\n      if (0 === this.writeBuffer.length) {\n        this.emit(\"drain\");\n      } else {\n        this.flush();\n      }\n    }\n    /**\n     * Flush write buffers.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"flush\",\n    value: function flush() {\n      if (\"closed\" !== this.readyState && this.transport.writable && !this.upgrading && this.writeBuffer.length) {\n        debug(\"flushing %d packets in socket\", this.writeBuffer.length);\n        this.transport.send(this.writeBuffer); // keep track of current length of writeBuffer\n        // splice writeBuffer and callbackBuffer on `drain`\n\n        this.prevBufferLen = this.writeBuffer.length;\n        this.emit(\"flush\");\n      }\n    }\n    /**\n     * Sends a message.\n     *\n     * @param {String} message.\n     * @param {Function} callback function.\n     * @param {Object} options.\n     * @return {Socket} for chaining.\n     * @api public\n     */\n\n  }, {\n    key: \"write\",\n    value: function write(msg, options, fn) {\n      this.sendPacket(\"message\", msg, options, fn);\n      return this;\n    }\n  }, {\n    key: \"send\",\n    value: function send(msg, options, fn) {\n      this.sendPacket(\"message\", msg, options, fn);\n      return this;\n    }\n    /**\n     * Sends a packet.\n     *\n     * @param {String} packet type.\n     * @param {String} data.\n     * @param {Object} options.\n     * @param {Function} callback function.\n     * @api private\n     */\n\n  }, {\n    key: \"sendPacket\",\n    value: function sendPacket(type, data, options, fn) {\n      if (\"function\" === typeof data) {\n        fn = data;\n        data = undefined;\n      }\n\n      if (\"function\" === typeof options) {\n        fn = options;\n        options = null;\n      }\n\n      if (\"closing\" === this.readyState || \"closed\" === this.readyState) {\n        return;\n      }\n\n      options = options || {};\n      options.compress = false !== options.compress;\n      var packet = {\n        type: type,\n        data: data,\n        options: options\n      };\n      this.emit(\"packetCreate\", packet);\n      this.writeBuffer.push(packet);\n      if (fn) this.once(\"flush\", fn);\n      this.flush();\n    }\n    /**\n     * Closes the connection.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"close\",\n    value: function close() {\n      var _this6 = this;\n\n      var close = function close() {\n        _this6.onClose(\"forced close\");\n\n        debug(\"socket closing - telling transport to close\");\n\n        _this6.transport.close();\n      };\n\n      var cleanupAndClose = function cleanupAndClose() {\n        _this6.removeListener(\"upgrade\", cleanupAndClose);\n\n        _this6.removeListener(\"upgradeError\", cleanupAndClose);\n\n        close();\n      };\n\n      var waitForUpgrade = function waitForUpgrade() {\n        // wait for upgrade to finish since we can't send packets while pausing a transport\n        _this6.once(\"upgrade\", cleanupAndClose);\n\n        _this6.once(\"upgradeError\", cleanupAndClose);\n      };\n\n      if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n        this.readyState = \"closing\";\n\n        if (this.writeBuffer.length) {\n          this.once(\"drain\", function () {\n            if (_this6.upgrading) {\n              waitForUpgrade();\n            } else {\n              close();\n            }\n          });\n        } else if (this.upgrading) {\n          waitForUpgrade();\n        } else {\n          close();\n        }\n      }\n\n      return this;\n    }\n    /**\n     * Called upon transport error\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onError\",\n    value: function onError(err) {\n      debug(\"socket error %j\", err);\n      Socket.priorWebsocketSuccess = false;\n      this.emit(\"error\", err);\n      this.onClose(\"transport error\", err);\n    }\n    /**\n     * Called upon transport close.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onClose\",\n    value: function onClose(reason, desc) {\n      if (\"opening\" === this.readyState || \"open\" === this.readyState || \"closing\" === this.readyState) {\n        debug('socket close with reason: \"%s\"', reason); // clear timers\n\n        clearTimeout(this.pingIntervalTimer);\n        clearTimeout(this.pingTimeoutTimer); // stop event from firing again for transport\n\n        this.transport.removeAllListeners(\"close\"); // ensure transport won't stay open\n\n        this.transport.close(); // ignore further transport communication\n\n        this.transport.removeAllListeners();\n\n        if (typeof removeEventListener === \"function\") {\n          removeEventListener(\"offline\", this.offlineEventListener, false);\n        } // set ready state\n\n\n        this.readyState = \"closed\"; // clear session id\n\n        this.id = null; // emit close event\n\n        this.emit(\"close\", reason, desc); // clean buffers after, so users can still\n        // grab the buffers on `close` event\n\n        this.writeBuffer = [];\n        this.prevBufferLen = 0;\n      }\n    }\n    /**\n     * Filters upgrades, returning only those matching client transports.\n     *\n     * @param {Array} server upgrades\n     * @api private\n     *\n     */\n\n  }, {\n    key: \"filterUpgrades\",\n    value: function filterUpgrades(upgrades) {\n      var filteredUpgrades = [];\n      var i = 0;\n      var j = upgrades.length;\n\n      for (; i < j; i++) {\n        if (~this.transports.indexOf(upgrades[i])) filteredUpgrades.push(upgrades[i]);\n      }\n\n      return filteredUpgrades;\n    }\n  }]);\n\n  return Socket;\n}(Emitter);\n\nSocket.priorWebsocketSuccess = false;\n/**\n * Protocol version.\n *\n * @api public\n */\n\nSocket.protocol = parser.protocol; // this is an int\n\nfunction clone(obj) {\n  var o = {};\n\n  for (var i in obj) {\n    if (obj.hasOwnProperty(i)) {\n      o[i] = obj[i];\n    }\n  }\n\n  return o;\n}\n\nmodule.exports = Socket;\n\n//# sourceURL=webpack://eio/./lib/socket.js?");
-
-/***/ }),
-
-/***/ "./lib/transport.js":
-/*!**************************!*\
-  !*** ./lib/transport.js ***!
-  \**************************/
-/*! no static exports found */
-/***/ (function(module, exports, __webpack_require__) {
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Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\nvar parser = __webpack_require__(/*! engine.io-parser */ \"./node_modules/engine.io-parser/lib/index.js\");\n\nvar Emitter = __webpack_require__(/*! component-emitter */ \"./node_modules/component-emitter/index.js\");\n\nvar debug = __webpack_require__(/*! debug */ \"./node_modules/debug/src/browser.js\")(\"engine.io-client:transport\");\n\nvar Transport = /*#__PURE__*/function (_Emitter) {\n  _inherits(Transport, _Emitter);\n\n  var _super = _createSuper(Transport);\n\n  /**\n   * Transport abstract constructor.\n   *\n   * @param {Object} options.\n   * @api private\n   */\n  function Transport(opts) {\n    var _this;\n\n    _classCallCheck(this, Transport);\n\n    _this = _super.call(this);\n    _this.opts = opts;\n    _this.query = opts.query;\n    _this.readyState = \"\";\n    _this.socket = opts.socket;\n    return _this;\n  }\n  /**\n   * Emits an error.\n   *\n   * @param {String} str\n   * @return {Transport} for chaining\n   * @api public\n   */\n\n\n  _createClass(Transport, [{\n    key: \"onError\",\n    value: function onError(msg, desc) {\n      var err = new Error(msg);\n      err.type = \"TransportError\";\n      err.description = desc;\n      this.emit(\"error\", err);\n      return this;\n    }\n    /**\n     * Opens the transport.\n     *\n     * @api public\n     */\n\n  }, {\n    key: \"open\",\n    value: function open() {\n      if (\"closed\" === this.readyState || \"\" === this.readyState) {\n        this.readyState = \"opening\";\n        this.doOpen();\n      }\n\n      return this;\n    }\n    /**\n     * Closes the transport.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"close\",\n    value: function close() {\n      if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n        this.doClose();\n        this.onClose();\n      }\n\n      return this;\n    }\n    /**\n     * Sends multiple packets.\n     *\n     * @param {Array} packets\n     * @api private\n     */\n\n  }, {\n    key: \"send\",\n    value: function send(packets) {\n      if (\"open\" === this.readyState) {\n        this.write(packets);\n      } else {\n        // this might happen if the transport was silently closed in the beforeunload event handler\n        debug(\"transport is not open, discarding packets\");\n      }\n    }\n    /**\n     * Called upon open\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onOpen\",\n    value: function onOpen() {\n      this.readyState = \"open\";\n      this.writable = true;\n      this.emit(\"open\");\n    }\n    /**\n     * Called with data.\n     *\n     * @param {String} data\n     * @api private\n     */\n\n  }, {\n    key: \"onData\",\n    value: function onData(data) {\n      var packet = parser.decodePacket(data, this.socket.binaryType);\n      this.onPacket(packet);\n    }\n    /**\n     * Called with a decoded packet.\n     */\n\n  }, {\n    key: \"onPacket\",\n    value: function onPacket(packet) {\n      this.emit(\"packet\", packet);\n    }\n    /**\n     * Called upon close.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onClose\",\n    value: function onClose() {\n      this.readyState = \"closed\";\n      this.emit(\"close\");\n    }\n  }]);\n\n  return Transport;\n}(Emitter);\n\nmodule.exports = Transport;\n\n//# sourceURL=webpack://eio/./lib/transport.js?");
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-/***/ }),
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-/***/ "./lib/transports/index.js":
-/*!*********************************!*\
-  !*** ./lib/transports/index.js ***!
-  \*********************************/
-/*! no static exports found */
-/***/ (function(module, exports, __webpack_require__) {
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-eval("var XMLHttpRequest = __webpack_require__(/*! ../../contrib/xmlhttprequest-ssl/XMLHttpRequest */ \"./lib/xmlhttprequest.js\");\n\nvar XHR = __webpack_require__(/*! ./polling-xhr */ \"./lib/transports/polling-xhr.js\");\n\nvar JSONP = __webpack_require__(/*! ./polling-jsonp */ \"./lib/transports/polling-jsonp.js\");\n\nvar websocket = __webpack_require__(/*! ./websocket */ \"./lib/transports/websocket.js\");\n\nexports.polling = polling;\nexports.websocket = websocket;\n/**\n * Polling transport polymorphic constructor.\n * Decides on xhr vs jsonp based on feature detection.\n *\n * @api private\n */\n\nfunction polling(opts) {\n  var xhr;\n  var xd = false;\n  var xs = false;\n  var jsonp = false !== opts.jsonp;\n\n  if (typeof location !== \"undefined\") {\n    var isSSL = \"https:\" === location.protocol;\n    var port = location.port; // some user agents have empty `location.port`\n\n    if (!port) {\n      port = isSSL ? 443 : 80;\n    }\n\n    xd = opts.hostname !== location.hostname || port !== opts.port;\n    xs = opts.secure !== isSSL;\n  }\n\n  opts.xdomain = xd;\n  opts.xscheme = xs;\n  xhr = new XMLHttpRequest(opts);\n\n  if (\"open\" in xhr && !opts.forceJSONP) {\n    return new XHR(opts);\n  } else {\n    if (!jsonp) throw new Error(\"JSONP disabled\");\n    return new JSONP(opts);\n  }\n}\n\n//# sourceURL=webpack://eio/./lib/transports/index.js?");
-
-/***/ }),
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-/***/ "./lib/transports/polling-jsonp.js":
-/*!*****************************************!*\
-  !*** ./lib/transports/polling-jsonp.js ***!
-  \*****************************************/
-/*! no static exports found */
-/***/ (function(module, exports, __webpack_require__) {
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-eval("function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nfunction _get(target, property, receiver) { if (typeof Reflect !== \"undefined\" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }\n\nfunction _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function\"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\nfunction _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }\n\nfunction _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) { return call; } return _assertThisInitialized(self); }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _isNativeReflectConstruct() { if (typeof Reflect === \"undefined\" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === \"function\") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }\n\nfunction _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\nvar Polling = __webpack_require__(/*! ./polling */ \"./lib/transports/polling.js\");\n\nvar globalThis = __webpack_require__(/*! ../globalThis */ \"./lib/globalThis.browser.js\");\n\nvar rNewline = /\\n/g;\nvar rEscapedNewline = /\\\\n/g;\n/**\n * Global JSONP callbacks.\n */\n\nvar callbacks;\n\nvar JSONPPolling = /*#__PURE__*/function (_Polling) {\n  _inherits(JSONPPolling, _Polling);\n\n  var _super = _createSuper(JSONPPolling);\n\n  /**\n   * JSONP Polling constructor.\n   *\n   * @param {Object} opts.\n   * @api public\n   */\n  function JSONPPolling(opts) {\n    var _this;\n\n    _classCallCheck(this, JSONPPolling);\n\n    _this = _super.call(this, opts);\n    _this.query = _this.query || {}; // define global callbacks array if not present\n    // we do this here (lazily) to avoid unneeded global pollution\n\n    if (!callbacks) {\n      // we need to consider multiple engines in the same page\n      callbacks = globalThis.___eio = globalThis.___eio || [];\n    } // callback identifier\n\n\n    _this.index = callbacks.length; // add callback to jsonp global\n\n    callbacks.push(_this.onData.bind(_assertThisInitialized(_this))); // append to query string\n\n    _this.query.j = _this.index;\n    return _this;\n  }\n  /**\n   * JSONP only supports binary as base64 encoded strings\n   */\n\n\n  _createClass(JSONPPolling, [{\n    key: \"doClose\",\n\n    /**\n     * Closes the socket.\n     *\n     * @api private\n     */\n    value: function doClose() {\n      if (this.script) {\n        // prevent spurious errors from being emitted when the window is unloaded\n        this.script.onerror = function () {};\n\n        this.script.parentNode.removeChild(this.script);\n        this.script = null;\n      }\n\n      if (this.form) {\n        this.form.parentNode.removeChild(this.form);\n        this.form = null;\n        this.iframe = null;\n      }\n\n      _get(_getPrototypeOf(JSONPPolling.prototype), \"doClose\", this).call(this);\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"doPoll\",\n    value: function doPoll() {\n      var _this2 = this;\n\n      var script = document.createElement(\"script\");\n\n      if (this.script) {\n        this.script.parentNode.removeChild(this.script);\n        this.script = null;\n      }\n\n      script.async = true;\n      script.src = this.uri();\n\n      script.onerror = function (e) {\n        _this2.onError(\"jsonp poll error\", e);\n      };\n\n      var insertAt = document.getElementsByTagName(\"script\")[0];\n\n      if (insertAt) {\n        insertAt.parentNode.insertBefore(script, insertAt);\n      } else {\n        (document.head || document.body).appendChild(script);\n      }\n\n      this.script = script;\n      var isUAgecko = \"undefined\" !== typeof navigator && /gecko/i.test(navigator.userAgent);\n\n      if (isUAgecko) {\n        setTimeout(function () {\n          var iframe = document.createElement(\"iframe\");\n          document.body.appendChild(iframe);\n          document.body.removeChild(iframe);\n        }, 100);\n      }\n    }\n    /**\n     * Writes with a hidden iframe.\n     *\n     * @param {String} data to send\n     * @param {Function} called upon flush.\n     * @api private\n     */\n\n  }, {\n    key: \"doWrite\",\n    value: function doWrite(data, fn) {\n      var _this3 = this;\n\n      var iframe;\n\n      if (!this.form) {\n        var form = document.createElement(\"form\");\n        var area = document.createElement(\"textarea\");\n        var id = this.iframeId = \"eio_iframe_\" + this.index;\n        form.className = \"socketio\";\n        form.style.position = \"absolute\";\n        form.style.top = \"-1000px\";\n        form.style.left = \"-1000px\";\n        form.target = id;\n        form.method = \"POST\";\n        form.setAttribute(\"accept-charset\", \"utf-8\");\n        area.name = \"d\";\n        form.appendChild(area);\n        document.body.appendChild(form);\n        this.form = form;\n        this.area = area;\n      }\n\n      this.form.action = this.uri();\n\n      function complete() {\n        initIframe();\n        fn();\n      }\n\n      var initIframe = function initIframe() {\n        if (_this3.iframe) {\n          try {\n            _this3.form.removeChild(_this3.iframe);\n          } catch (e) {\n            _this3.onError(\"jsonp polling iframe removal error\", e);\n          }\n        }\n\n        try {\n          // ie6 dynamic iframes with target=\"\" support (thanks Chris Lambacher)\n          var html = '<iframe src=\"javascript:0\" name=\"' + _this3.iframeId + '\">';\n          iframe = document.createElement(html);\n        } catch (e) {\n          iframe = document.createElement(\"iframe\");\n          iframe.name = _this3.iframeId;\n          iframe.src = \"javascript:0\";\n        }\n\n        iframe.id = _this3.iframeId;\n\n        _this3.form.appendChild(iframe);\n\n        _this3.iframe = iframe;\n      };\n\n      initIframe(); // escape \\n to prevent it from being converted into \\r\\n by some UAs\n      // double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side\n\n      data = data.replace(rEscapedNewline, \"\\\\\\n\");\n      this.area.value = data.replace(rNewline, \"\\\\n\");\n\n      try {\n        this.form.submit();\n      } catch (e) {}\n\n      if (this.iframe.attachEvent) {\n        this.iframe.onreadystatechange = function () {\n          if (_this3.iframe.readyState === \"complete\") {\n            complete();\n          }\n        };\n      } else {\n        this.iframe.onload = complete;\n      }\n    }\n  }, {\n    key: \"supportsBinary\",\n    get: function get() {\n      return false;\n    }\n  }]);\n\n  return JSONPPolling;\n}(Polling);\n\nmodule.exports = JSONPPolling;\n\n//# sourceURL=webpack://eio/./lib/transports/polling-jsonp.js?");
-
-/***/ }),
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-/***/ "./lib/transports/polling-xhr.js":
-/*!***************************************!*\
-  !*** ./lib/transports/polling-xhr.js ***!
-  \***************************************/
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-/***/ (function(module, exports, __webpack_require__) {
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-eval("function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nfunction _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function\"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\nfunction _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }\n\nfunction _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) { return call; } return _assertThisInitialized(self); }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _isNativeReflectConstruct() { if (typeof Reflect === \"undefined\" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === \"function\") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }\n\nfunction _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\n/* global attachEvent */\nvar XMLHttpRequest = __webpack_require__(/*! ../../contrib/xmlhttprequest-ssl/XMLHttpRequest */ \"./lib/xmlhttprequest.js\");\n\nvar Polling = __webpack_require__(/*! ./polling */ \"./lib/transports/polling.js\");\n\nvar Emitter = __webpack_require__(/*! component-emitter */ \"./node_modules/component-emitter/index.js\");\n\nvar _require = __webpack_require__(/*! ../util */ \"./lib/util.js\"),\n    pick = _require.pick;\n\nvar globalThis = __webpack_require__(/*! ../globalThis */ \"./lib/globalThis.browser.js\");\n\nvar debug = __webpack_require__(/*! debug */ \"./node_modules/debug/src/browser.js\")(\"engine.io-client:polling-xhr\");\n/**\n * Empty function\n */\n\n\nfunction empty() {}\n\nvar hasXHR2 = function () {\n  var xhr = new XMLHttpRequest({\n    xdomain: false\n  });\n  return null != xhr.responseType;\n}();\n\nvar XHR = /*#__PURE__*/function (_Polling) {\n  _inherits(XHR, _Polling);\n\n  var _super = _createSuper(XHR);\n\n  /**\n   * XHR Polling constructor.\n   *\n   * @param {Object} opts\n   * @api public\n   */\n  function XHR(opts) {\n    var _this;\n\n    _classCallCheck(this, XHR);\n\n    _this = _super.call(this, opts);\n\n    if (typeof location !== \"undefined\") {\n      var isSSL = \"https:\" === location.protocol;\n      var port = location.port; // some user agents have empty `location.port`\n\n      if (!port) {\n        port = isSSL ? 443 : 80;\n      }\n\n      _this.xd = typeof location !== \"undefined\" && opts.hostname !== location.hostname || port !== opts.port;\n      _this.xs = opts.secure !== isSSL;\n    }\n    /**\n     * XHR supports binary\n     */\n\n\n    var forceBase64 = opts && opts.forceBase64;\n    _this.supportsBinary = hasXHR2 && !forceBase64;\n    return _this;\n  }\n  /**\n   * Creates a request.\n   *\n   * @param {String} method\n   * @api private\n   */\n\n\n  _createClass(XHR, [{\n    key: \"request\",\n    value: function request() {\n      var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};\n\n      _extends(opts, {\n        xd: this.xd,\n        xs: this.xs\n      }, this.opts);\n\n      return new Request(this.uri(), opts);\n    }\n    /**\n     * Sends data.\n     *\n     * @param {String} data to send.\n     * @param {Function} called upon flush.\n     * @api private\n     */\n\n  }, {\n    key: \"doWrite\",\n    value: function doWrite(data, fn) {\n      var _this2 = this;\n\n      var req = this.request({\n        method: \"POST\",\n        data: data\n      });\n      req.on(\"success\", fn);\n      req.on(\"error\", function (err) {\n        _this2.onError(\"xhr post error\", err);\n      });\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"doPoll\",\n    value: function doPoll() {\n      var _this3 = this;\n\n      debug(\"xhr poll\");\n      var req = this.request();\n      req.on(\"data\", this.onData.bind(this));\n      req.on(\"error\", function (err) {\n        _this3.onError(\"xhr poll error\", err);\n      });\n      this.pollXhr = req;\n    }\n  }]);\n\n  return XHR;\n}(Polling);\n\nvar Request = /*#__PURE__*/function (_Emitter) {\n  _inherits(Request, _Emitter);\n\n  var _super2 = _createSuper(Request);\n\n  /**\n   * Request constructor\n   *\n   * @param {Object} options\n   * @api public\n   */\n  function Request(uri, opts) {\n    var _this4;\n\n    _classCallCheck(this, Request);\n\n    _this4 = _super2.call(this);\n    _this4.opts = opts;\n    _this4.method = opts.method || \"GET\";\n    _this4.uri = uri;\n    _this4.async = false !== opts.async;\n    _this4.data = undefined !== opts.data ? opts.data : null;\n\n    _this4.create();\n\n    return _this4;\n  }\n  /**\n   * Creates the XHR object and sends the request.\n   *\n   * @api private\n   */\n\n\n  _createClass(Request, [{\n    key: \"create\",\n    value: function create() {\n      var _this5 = this;\n\n      var opts = pick(this.opts, \"agent\", \"enablesXDR\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"autoUnref\");\n      opts.xdomain = !!this.opts.xd;\n      opts.xscheme = !!this.opts.xs;\n      var xhr = this.xhr = new XMLHttpRequest(opts);\n\n      try {\n        debug(\"xhr open %s: %s\", this.method, this.uri);\n        xhr.open(this.method, this.uri, this.async);\n\n        try {\n          if (this.opts.extraHeaders) {\n            xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n\n            for (var i in this.opts.extraHeaders) {\n              if (this.opts.extraHeaders.hasOwnProperty(i)) {\n                xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n              }\n            }\n          }\n        } catch (e) {}\n\n        if (\"POST\" === this.method) {\n          try {\n            xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n          } catch (e) {}\n        }\n\n        try {\n          xhr.setRequestHeader(\"Accept\", \"*/*\");\n        } catch (e) {} // ie6 check\n\n\n        if (\"withCredentials\" in xhr) {\n          xhr.withCredentials = this.opts.withCredentials;\n        }\n\n        if (this.opts.requestTimeout) {\n          xhr.timeout = this.opts.requestTimeout;\n        }\n\n        if (this.hasXDR()) {\n          xhr.onload = function () {\n            _this5.onLoad();\n          };\n\n          xhr.onerror = function () {\n            _this5.onError(xhr.responseText);\n          };\n        } else {\n          xhr.onreadystatechange = function () {\n            if (4 !== xhr.readyState) return;\n\n            if (200 === xhr.status || 1223 === xhr.status) {\n              _this5.onLoad();\n            } else {\n              // make sure the `error` event handler that's user-set\n              // does not throw in the same tick and gets caught here\n              setTimeout(function () {\n                _this5.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n              }, 0);\n            }\n          };\n        }\n\n        debug(\"xhr data %s\", this.data);\n        xhr.send(this.data);\n      } catch (e) {\n        // Need to defer since .create() is called directly from the constructor\n        // and thus the 'error' event can only be only bound *after* this exception\n        // occurs.  Therefore, also, we cannot throw here at all.\n        setTimeout(function () {\n          _this5.onError(e);\n        }, 0);\n        return;\n      }\n\n      if (typeof document !== \"undefined\") {\n        this.index = Request.requestsCount++;\n        Request.requests[this.index] = this;\n      }\n    }\n    /**\n     * Called upon successful response.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onSuccess\",\n    value: function onSuccess() {\n      this.emit(\"success\");\n      this.cleanup();\n    }\n    /**\n     * Called if we have data.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onData\",\n    value: function onData(data) {\n      this.emit(\"data\", data);\n      this.onSuccess();\n    }\n    /**\n     * Called upon error.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onError\",\n    value: function onError(err) {\n      this.emit(\"error\", err);\n      this.cleanup(true);\n    }\n    /**\n     * Cleans up house.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"cleanup\",\n    value: function cleanup(fromError) {\n      if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n        return;\n      } // xmlhttprequest\n\n\n      if (this.hasXDR()) {\n        this.xhr.onload = this.xhr.onerror = empty;\n      } else {\n        this.xhr.onreadystatechange = empty;\n      }\n\n      if (fromError) {\n        try {\n          this.xhr.abort();\n        } catch (e) {}\n      }\n\n      if (typeof document !== \"undefined\") {\n        delete Request.requests[this.index];\n      }\n\n      this.xhr = null;\n    }\n    /**\n     * Called upon load.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onLoad\",\n    value: function onLoad() {\n      var data = this.xhr.responseText;\n\n      if (data !== null) {\n        this.onData(data);\n      }\n    }\n    /**\n     * Check if it has XDomainRequest.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"hasXDR\",\n    value: function hasXDR() {\n      return typeof XDomainRequest !== \"undefined\" && !this.xs && this.enablesXDR;\n    }\n    /**\n     * Aborts the request.\n     *\n     * @api public\n     */\n\n  }, {\n    key: \"abort\",\n    value: function abort() {\n      this.cleanup();\n    }\n  }]);\n\n  return Request;\n}(Emitter);\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\n\n\nRequest.requestsCount = 0;\nRequest.requests = {};\n\nif (typeof document !== \"undefined\") {\n  if (typeof attachEvent === \"function\") {\n    attachEvent(\"onunload\", unloadHandler);\n  } else if (typeof addEventListener === \"function\") {\n    var terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n    addEventListener(terminationEvent, unloadHandler, false);\n  }\n}\n\nfunction unloadHandler() {\n  for (var i in Request.requests) {\n    if (Request.requests.hasOwnProperty(i)) {\n      Request.requests[i].abort();\n    }\n  }\n}\n\nmodule.exports = XHR;\nmodule.exports.Request = Request;\n\n//# sourceURL=webpack://eio/./lib/transports/polling-xhr.js?");
-
-/***/ }),
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-/***/ "./lib/transports/polling.js":
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-  !*** ./lib/transports/polling.js ***!
-  \***********************************/
-/*! no static exports found */
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-eval("function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function\"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\nfunction _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }\n\nfunction _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) { return call; } return _assertThisInitialized(self); }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _isNativeReflectConstruct() { if (typeof Reflect === \"undefined\" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === \"function\") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }\n\nfunction _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\nvar Transport = __webpack_require__(/*! ../transport */ \"./lib/transport.js\");\n\nvar parseqs = __webpack_require__(/*! parseqs */ \"./node_modules/parseqs/index.js\");\n\nvar parser = __webpack_require__(/*! engine.io-parser */ \"./node_modules/engine.io-parser/lib/index.js\");\n\nvar yeast = __webpack_require__(/*! yeast */ \"./node_modules/yeast/index.js\");\n\nvar debug = __webpack_require__(/*! debug */ \"./node_modules/debug/src/browser.js\")(\"engine.io-client:polling\");\n\nvar Polling = /*#__PURE__*/function (_Transport) {\n  _inherits(Polling, _Transport);\n\n  var _super = _createSuper(Polling);\n\n  function Polling() {\n    _classCallCheck(this, Polling);\n\n    return _super.apply(this, arguments);\n  }\n\n  _createClass(Polling, [{\n    key: \"doOpen\",\n\n    /**\n     * Opens the socket (triggers polling). We write a PING message to determine\n     * when the transport is open.\n     *\n     * @api private\n     */\n    value: function doOpen() {\n      this.poll();\n    }\n    /**\n     * Pauses polling.\n     *\n     * @param {Function} callback upon buffers are flushed and transport is paused\n     * @api private\n     */\n\n  }, {\n    key: \"pause\",\n    value: function pause(onPause) {\n      var _this = this;\n\n      this.readyState = \"pausing\";\n\n      var pause = function pause() {\n        debug(\"paused\");\n        _this.readyState = \"paused\";\n        onPause();\n      };\n\n      if (this.polling || !this.writable) {\n        var total = 0;\n\n        if (this.polling) {\n          debug(\"we are currently polling - waiting to pause\");\n          total++;\n          this.once(\"pollComplete\", function () {\n            debug(\"pre-pause polling complete\");\n            --total || pause();\n          });\n        }\n\n        if (!this.writable) {\n          debug(\"we are currently writing - waiting to pause\");\n          total++;\n          this.once(\"drain\", function () {\n            debug(\"pre-pause writing complete\");\n            --total || pause();\n          });\n        }\n      } else {\n        pause();\n      }\n    }\n    /**\n     * Starts polling cycle.\n     *\n     * @api public\n     */\n\n  }, {\n    key: \"poll\",\n    value: function poll() {\n      debug(\"polling\");\n      this.polling = true;\n      this.doPoll();\n      this.emit(\"poll\");\n    }\n    /**\n     * Overloads onData to detect payloads.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onData\",\n    value: function onData(data) {\n      var _this2 = this;\n\n      debug(\"polling got data %s\", data);\n\n      var callback = function callback(packet) {\n        // if its the first message we consider the transport open\n        if (\"opening\" === _this2.readyState && packet.type === \"open\") {\n          _this2.onOpen();\n        } // if its a close packet, we close the ongoing requests\n\n\n        if (\"close\" === packet.type) {\n          _this2.onClose();\n\n          return false;\n        } // otherwise bypass onData and handle the message\n\n\n        _this2.onPacket(packet);\n      }; // decode payload\n\n\n      parser.decodePayload(data, this.socket.binaryType).forEach(callback); // if an event did not trigger closing\n\n      if (\"closed\" !== this.readyState) {\n        // if we got data we're not polling\n        this.polling = false;\n        this.emit(\"pollComplete\");\n\n        if (\"open\" === this.readyState) {\n          this.poll();\n        } else {\n          debug('ignoring poll - transport state \"%s\"', this.readyState);\n        }\n      }\n    }\n    /**\n     * For polling, send a close packet.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"doClose\",\n    value: function doClose() {\n      var _this3 = this;\n\n      var close = function close() {\n        debug(\"writing close packet\");\n\n        _this3.write([{\n          type: \"close\"\n        }]);\n      };\n\n      if (\"open\" === this.readyState) {\n        debug(\"transport open - closing\");\n        close();\n      } else {\n        // in case we're trying to close while\n        // handshaking is in progress (GH-164)\n        debug(\"transport not open - deferring close\");\n        this.once(\"open\", close);\n      }\n    }\n    /**\n     * Writes a packets payload.\n     *\n     * @param {Array} data packets\n     * @param {Function} drain callback\n     * @api private\n     */\n\n  }, {\n    key: \"write\",\n    value: function write(packets) {\n      var _this4 = this;\n\n      this.writable = false;\n      parser.encodePayload(packets, function (data) {\n        _this4.doWrite(data, function () {\n          _this4.writable = true;\n\n          _this4.emit(\"drain\");\n        });\n      });\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"uri\",\n    value: function uri() {\n      var query = this.query || {};\n      var schema = this.opts.secure ? \"https\" : \"http\";\n      var port = \"\"; // cache busting is forced\n\n      if (false !== this.opts.timestampRequests) {\n        query[this.opts.timestampParam] = yeast();\n      }\n\n      if (!this.supportsBinary && !query.sid) {\n        query.b64 = 1;\n      }\n\n      query = parseqs.encode(query); // avoid port if default for schema\n\n      if (this.opts.port && (\"https\" === schema && Number(this.opts.port) !== 443 || \"http\" === schema && Number(this.opts.port) !== 80)) {\n        port = \":\" + this.opts.port;\n      } // prepend ? to query\n\n\n      if (query.length) {\n        query = \"?\" + query;\n      }\n\n      var ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n      return schema + \"://\" + (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) + port + this.opts.path + query;\n    }\n  }, {\n    key: \"name\",\n\n    /**\n     * Transport name.\n     */\n    get: function get() {\n      return \"polling\";\n    }\n  }]);\n\n  return Polling;\n}(Transport);\n\nmodule.exports = Polling;\n\n//# sourceURL=webpack://eio/./lib/transports/polling.js?");
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-/***/ }),
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-/***/ "./lib/transports/websocket-constructor.browser.js":
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-  !*** ./lib/transports/websocket-constructor.browser.js ***!
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-/***/ }),
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-eval("function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if (\"value\" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nfunction _inherits(subClass, superClass) { if (typeof superClass !== \"function\" && superClass !== null) { throw new TypeError(\"Super expression must either be null or a function\"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }\n\nfunction _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }\n\nfunction _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }\n\nfunction _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) { return call; } return _assertThisInitialized(self); }\n\nfunction _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\"); } return self; }\n\nfunction _isNativeReflectConstruct() { if (typeof Reflect === \"undefined\" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === \"function\") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }\n\nfunction _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }\n\nvar Transport = __webpack_require__(/*! ../transport */ \"./lib/transport.js\");\n\nvar parser = __webpack_require__(/*! engine.io-parser */ \"./node_modules/engine.io-parser/lib/index.js\");\n\nvar parseqs = __webpack_require__(/*! parseqs */ \"./node_modules/parseqs/index.js\");\n\nvar yeast = __webpack_require__(/*! yeast */ \"./node_modules/yeast/index.js\");\n\nvar _require = __webpack_require__(/*! ../util */ \"./lib/util.js\"),\n    pick = _require.pick;\n\nvar _require2 = __webpack_require__(/*! ./websocket-constructor */ \"./lib/transports/websocket-constructor.browser.js\"),\n    WebSocket = _require2.WebSocket,\n    usingBrowserWebSocket = _require2.usingBrowserWebSocket,\n    defaultBinaryType = _require2.defaultBinaryType,\n    nextTick = _require2.nextTick;\n\nvar debug = __webpack_require__(/*! debug */ \"./node_modules/debug/src/browser.js\")(\"engine.io-client:websocket\"); // detect ReactNative environment\n\n\nvar isReactNative = typeof navigator !== \"undefined\" && typeof navigator.product === \"string\" && navigator.product.toLowerCase() === \"reactnative\";\n\nvar WS = /*#__PURE__*/function (_Transport) {\n  _inherits(WS, _Transport);\n\n  var _super = _createSuper(WS);\n\n  /**\n   * WebSocket transport constructor.\n   *\n   * @api {Object} connection options\n   * @api public\n   */\n  function WS(opts) {\n    var _this;\n\n    _classCallCheck(this, WS);\n\n    _this = _super.call(this, opts);\n    _this.supportsBinary = !opts.forceBase64;\n    return _this;\n  }\n  /**\n   * Transport name.\n   *\n   * @api public\n   */\n\n\n  _createClass(WS, [{\n    key: \"doOpen\",\n\n    /**\n     * Opens socket.\n     *\n     * @api private\n     */\n    value: function doOpen() {\n      if (!this.check()) {\n        // let probe timeout\n        return;\n      }\n\n      var uri = this.uri();\n      var protocols = this.opts.protocols; // React Native only supports the 'headers' option, and will print a warning if anything else is passed\n\n      var opts = isReactNative ? {} : pick(this.opts, \"agent\", \"perMessageDeflate\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"localAddress\", \"protocolVersion\", \"origin\", \"maxPayload\", \"family\", \"checkServerIdentity\");\n\n      if (this.opts.extraHeaders) {\n        opts.headers = this.opts.extraHeaders;\n      }\n\n      try {\n        this.ws = usingBrowserWebSocket && !isReactNative ? protocols ? new WebSocket(uri, protocols) : new WebSocket(uri) : new WebSocket(uri, protocols, opts);\n      } catch (err) {\n        return this.emit(\"error\", err);\n      }\n\n      this.ws.binaryType = this.socket.binaryType || defaultBinaryType;\n      this.addEventListeners();\n    }\n    /**\n     * Adds event listeners to the socket\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"addEventListeners\",\n    value: function addEventListeners() {\n      var _this2 = this;\n\n      this.ws.onopen = function () {\n        if (_this2.opts.autoUnref) {\n          _this2.ws._socket.unref();\n        }\n\n        _this2.onOpen();\n      };\n\n      this.ws.onclose = this.onClose.bind(this);\n\n      this.ws.onmessage = function (ev) {\n        return _this2.onData(ev.data);\n      };\n\n      this.ws.onerror = function (e) {\n        return _this2.onError(\"websocket error\", e);\n      };\n    }\n    /**\n     * Writes data to socket.\n     *\n     * @param {Array} array of packets.\n     * @api private\n     */\n\n  }, {\n    key: \"write\",\n    value: function write(packets) {\n      var _this3 = this;\n\n      this.writable = false; // encodePacket efficient as it uses WS framing\n      // no need for encodePayload\n\n      var _loop = function _loop(i) {\n        var packet = packets[i];\n        var lastPacket = i === packets.length - 1;\n        parser.encodePacket(packet, _this3.supportsBinary, function (data) {\n          // always create a new object (GH-437)\n          var opts = {};\n\n          if (!usingBrowserWebSocket) {\n            if (packet.options) {\n              opts.compress = packet.options.compress;\n            }\n\n            if (_this3.opts.perMessageDeflate) {\n              var len = \"string\" === typeof data ? Buffer.byteLength(data) : data.length;\n\n              if (len < _this3.opts.perMessageDeflate.threshold) {\n                opts.compress = false;\n              }\n            }\n          } // Sometimes the websocket has already been closed but the browser didn't\n          // have a chance of informing us about it yet, in that case send will\n          // throw an error\n\n\n          try {\n            if (usingBrowserWebSocket) {\n              // TypeError is thrown when passing the second argument on Safari\n              _this3.ws.send(data);\n            } else {\n              _this3.ws.send(data, opts);\n            }\n          } catch (e) {\n            debug(\"websocket closed before onclose event\");\n          }\n\n          if (lastPacket) {\n            // fake drain\n            // defer to next tick to allow Socket to clear writeBuffer\n            nextTick(function () {\n              _this3.writable = true;\n\n              _this3.emit(\"drain\");\n            });\n          }\n        });\n      };\n\n      for (var i = 0; i < packets.length; i++) {\n        _loop(i);\n      }\n    }\n    /**\n     * Called upon close\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"onClose\",\n    value: function onClose() {\n      Transport.prototype.onClose.call(this);\n    }\n    /**\n     * Closes socket.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"doClose\",\n    value: function doClose() {\n      if (typeof this.ws !== \"undefined\") {\n        this.ws.close();\n        this.ws = null;\n      }\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n\n  }, {\n    key: \"uri\",\n    value: function uri() {\n      var query = this.query || {};\n      var schema = this.opts.secure ? \"wss\" : \"ws\";\n      var port = \"\"; // avoid port if default for schema\n\n      if (this.opts.port && (\"wss\" === schema && Number(this.opts.port) !== 443 || \"ws\" === schema && Number(this.opts.port) !== 80)) {\n        port = \":\" + this.opts.port;\n      } // append timestamp to URI\n\n\n      if (this.opts.timestampRequests) {\n        query[this.opts.timestampParam] = yeast();\n      } // communicate binary support capabilities\n\n\n      if (!this.supportsBinary) {\n        query.b64 = 1;\n      }\n\n      query = parseqs.encode(query); // prepend ? to query\n\n      if (query.length) {\n        query = \"?\" + query;\n      }\n\n      var ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n      return schema + \"://\" + (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) + port + this.opts.path + query;\n    }\n    /**\n     * Feature detection for WebSocket.\n     *\n     * @return {Boolean} whether this transport is available.\n     * @api public\n     */\n\n  }, {\n    key: \"check\",\n    value: function check() {\n      return !!WebSocket && !(\"__initialize\" in WebSocket && this.name === WS.prototype.name);\n    }\n  }, {\n    key: \"name\",\n    get: function get() {\n      return \"websocket\";\n    }\n  }]);\n\n  return WS;\n}(Transport);\n\nmodule.exports = WS;\n\n//# sourceURL=webpack://eio/./lib/transports/websocket.js?");
-
-/***/ }),
-
-/***/ "./lib/util.js":
-/*!*********************!*\
-  !*** ./lib/util.js ***!
-  \*********************/
-/*! no static exports found */
-/***/ (function(module, exports) {
-
-eval("module.exports.pick = function (obj) {\n  for (var _len = arguments.length, attr = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    attr[_key - 1] = arguments[_key];\n  }\n\n  return attr.reduce(function (acc, k) {\n    if (obj.hasOwnProperty(k)) {\n      acc[k] = obj[k];\n    }\n\n    return acc;\n  }, {});\n};\n\n//# sourceURL=webpack://eio/./lib/util.js?");
-
-/***/ }),
-
-/***/ "./lib/xmlhttprequest.js":
-/*!*******************************!*\
-  !*** ./lib/xmlhttprequest.js ***!
-  \*******************************/
-/*! no static exports found */
-/***/ (function(module, exports, __webpack_require__) {
-
-eval("// browser shim for xmlhttprequest module\nvar hasCORS = __webpack_require__(/*! has-cors */ \"./node_modules/has-cors/index.js\");\n\nvar globalThis = __webpack_require__(/*! ./globalThis */ \"./lib/globalThis.browser.js\");\n\nmodule.exports = function (opts) {\n  var xdomain = opts.xdomain; // scheme must be same when usign XDomainRequest\n  // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx\n\n  var xscheme = opts.xscheme; // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.\n  // https://github.com/Automattic/engine.io-client/pull/217\n\n  var enablesXDR = opts.enablesXDR; // XMLHttpRequest can be disabled on IE\n\n  try {\n    if (\"undefined\" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {\n      return new XMLHttpRequest();\n    }\n  } catch (e) {} // Use XDomainRequest for IE8 if enablesXDR is true\n  // because loading bar keeps flashing when using jsonp-polling\n  // https://github.com/yujiosaka/socke.io-ie8-loading-example\n\n\n  try {\n    if (\"undefined\" !== typeof XDomainRequest && !xscheme && enablesXDR) {\n      return new XDomainRequest();\n    }\n  } catch (e) {}\n\n  if (!xdomain) {\n    try {\n      return new globalThis[[\"Active\"].concat(\"Object\").join(\"X\")](\"Microsoft.XMLHTTP\");\n    } catch (e) {}\n  }\n};\n\n//# sourceURL=webpack://eio/./lib/xmlhttprequest.js?");
-
-/***/ }),
-
-/***/ "./node_modules/base64-arraybuffer/lib/base64-arraybuffer.js":
-/*!*******************************************************************!*\
-  !*** ./node_modules/base64-arraybuffer/lib/base64-arraybuffer.js ***!
-  \*******************************************************************/
-/*! no static exports found */
-/***/ (function(module, exports) {
-
-eval("/*\n * base64-arraybuffer\n * https://github.com/niklasvh/base64-arraybuffer\n *\n * Copyright (c) 2012 Niklas von Hertzen\n * Licensed under the MIT license.\n */\n(function (chars) {\n  \"use strict\";\n\n  exports.encode = function (arraybuffer) {\n    var bytes = new Uint8Array(arraybuffer),\n        i,\n        len = bytes.length,\n        base64 = \"\";\n\n    for (i = 0; i < len; i += 3) {\n      base64 += chars[bytes[i] >> 2];\n      base64 += chars[(bytes[i] & 3) << 4 | bytes[i + 1] >> 4];\n      base64 += chars[(bytes[i + 1] & 15) << 2 | bytes[i + 2] >> 6];\n      base64 += chars[bytes[i + 2] & 63];\n    }\n\n    if (len % 3 === 2) {\n      base64 = base64.substring(0, base64.length - 1) + \"=\";\n    } else if (len % 3 === 1) {\n      base64 = base64.substring(0, base64.length - 2) + \"==\";\n    }\n\n    return base64;\n  };\n\n  exports.decode = function (base64) {\n    var bufferLength = base64.length * 0.75,\n        len = base64.length,\n        i,\n        p = 0,\n        encoded1,\n        encoded2,\n        encoded3,\n        encoded4;\n\n    if (base64[base64.length - 1] === \"=\") {\n      bufferLength--;\n\n      if (base64[base64.length - 2] === \"=\") {\n        bufferLength--;\n      }\n    }\n\n    var arraybuffer = new ArrayBuffer(bufferLength),\n        bytes = new Uint8Array(arraybuffer);\n\n    for (i = 0; i < len; i += 4) {\n      encoded1 = chars.indexOf(base64[i]);\n      encoded2 = chars.indexOf(base64[i + 1]);\n      encoded3 = chars.indexOf(base64[i + 2]);\n      encoded4 = chars.indexOf(base64[i + 3]);\n      bytes[p++] = encoded1 << 2 | encoded2 >> 4;\n      bytes[p++] = (encoded2 & 15) << 4 | encoded3 >> 2;\n      bytes[p++] = (encoded3 & 3) << 6 | encoded4 & 63;\n    }\n\n    return arraybuffer;\n  };\n})(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/\");\n\n//# sourceURL=webpack://eio/./node_modules/base64-arraybuffer/lib/base64-arraybuffer.js?");
-
-/***/ }),
-
-/***/ "./node_modules/component-emitter/index.js":
-/*!*************************************************!*\
-  !*** ./node_modules/component-emitter/index.js ***!
-  \*************************************************/
-/*! no static exports found */
-/***/ (function(module, exports, __webpack_require__) {
-
-eval("/**\r\n * Expose `Emitter`.\r\n */\nif (true) {\n  module.exports = Emitter;\n}\n/**\r\n * Initialize a new `Emitter`.\r\n *\r\n * @api public\r\n */\n\n\nfunction Emitter(obj) {\n  if (obj) return mixin(obj);\n}\n\n;\n/**\r\n * Mixin the emitter properties.\r\n *\r\n * @param {Object} obj\r\n * @return {Object}\r\n * @api private\r\n */\n\nfunction mixin(obj) {\n  for (var key in Emitter.prototype) {\n    obj[key] = Emitter.prototype[key];\n  }\n\n  return obj;\n}\n/**\r\n * Listen on the given `event` with `fn`.\r\n *\r\n * @param {String} event\r\n * @param {Function} fn\r\n * @return {Emitter}\r\n * @api public\r\n */\n\n\nEmitter.prototype.on = Emitter.prototype.addEventListener = function (event, fn) {\n  this._callbacks = this._callbacks || {};\n  (this._callbacks['$' + event] = this._callbacks['$' + event] || []).push(fn);\n  return this;\n};\n/**\r\n * Adds an `event` listener that will be invoked a single\r\n * time then automatically removed.\r\n *\r\n * @param {String} event\r\n * @param {Function} fn\r\n * @return {Emitter}\r\n * @api public\r\n */\n\n\nEmitter.prototype.once = function (event, fn) {\n  function on() {\n    this.off(event, on);\n    fn.apply(this, arguments);\n  }\n\n  on.fn = fn;\n  this.on(event, on);\n  return this;\n};\n/**\r\n * Remove the given callback for `event` or all\r\n * registered callbacks.\r\n *\r\n * @param {String} event\r\n * @param {Function} fn\r\n * @return {Emitter}\r\n * @api public\r\n */\n\n\nEmitter.prototype.off = Emitter.prototype.removeListener = Emitter.prototype.removeAllListeners = Emitter.prototype.removeEventListener = function (event, fn) {\n  this._callbacks = this._callbacks || {}; // all\n\n  if (0 == arguments.length) {\n    this._callbacks = {};\n    return this;\n  } // specific event\n\n\n  var callbacks = this._callbacks['$' + event];\n  if (!callbacks) return this; // remove all handlers\n\n  if (1 == arguments.length) {\n    delete this._callbacks['$' + event];\n    return this;\n  } // remove specific handler\n\n\n  var cb;\n\n  for (var i = 0; i < callbacks.length; i++) {\n    cb = callbacks[i];\n\n    if (cb === fn || cb.fn === fn) {\n      callbacks.splice(i, 1);\n      break;\n    }\n  } // Remove event specific arrays for event types that no\n  // one is subscribed for to avoid memory leak.\n\n\n  if (callbacks.length === 0) {\n    delete this._callbacks['$' + event];\n  }\n\n  return this;\n};\n/**\r\n * Emit `event` with the given args.\r\n *\r\n * @param {String} event\r\n * @param {Mixed} ...\r\n * @return {Emitter}\r\n */\n\n\nEmitter.prototype.emit = function (event) {\n  this._callbacks = this._callbacks || {};\n  var args = new Array(arguments.length - 1),\n      callbacks = this._callbacks['$' + event];\n\n  for (var i = 1; i < arguments.length; i++) {\n    args[i - 1] = arguments[i];\n  }\n\n  if (callbacks) {\n    callbacks = callbacks.slice(0);\n\n    for (var i = 0, len = callbacks.length; i < len; ++i) {\n      callbacks[i].apply(this, args);\n    }\n  }\n\n  return this;\n};\n/**\r\n * Return array of callbacks for `event`.\r\n *\r\n * @param {String} event\r\n * @return {Array}\r\n * @api public\r\n */\n\n\nEmitter.prototype.listeners = function (event) {\n  this._callbacks = this._callbacks || {};\n  return this._callbacks['$' + event] || [];\n};\n/**\r\n * Check if this emitter has `event` handlers.\r\n *\r\n * @param {String} event\r\n * @return {Boolean}\r\n * @api public\r\n */\n\n\nEmitter.prototype.hasListeners = function (event) {\n  return !!this.listeners(event).length;\n};\n\n//# sourceURL=webpack://eio/./node_modules/component-emitter/index.js?");
-
-/***/ }),
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-/***/ "./node_modules/debug/src/browser.js":
-/*!*******************************************!*\
-  !*** ./node_modules/debug/src/browser.js ***!
-  \*******************************************/
-/*! no static exports found */
-/***/ (function(module, exports, __webpack_require__) {
-
-eval("/* eslint-env browser */\n\n/**\n * This is the web browser implementation of `debug()`.\n */\nexports.formatArgs = formatArgs;\nexports.save = save;\nexports.load = load;\nexports.useColors = useColors;\nexports.storage = localstorage();\n\nexports.destroy = function () {\n  var warned = false;\n  return function () {\n    if (!warned) {\n      warned = true;\n      console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');\n    }\n  };\n}();\n/**\n * Colors.\n */\n\n\nexports.colors = ['#0000CC', '#0000FF', '#0033CC', '#0033FF', '#0066CC', '#0066FF', '#0099CC', '#0099FF', '#00CC00', '#00CC33', '#00CC66', '#00CC99', '#00CCCC', '#00CCFF', '#3300CC', '#3300FF', '#3333CC', '#3333FF', '#3366CC', '#3366FF', '#3399CC', '#3399FF', '#33CC00', '#33CC33', '#33CC66', '#33CC99', '#33CCCC', '#33CCFF', '#6600CC', '#6600FF', '#6633CC', '#6633FF', '#66CC00', '#66CC33', '#9900CC', '#9900FF', '#9933CC', '#9933FF', '#99CC00', '#99CC33', '#CC0000', '#CC0033', '#CC0066', '#CC0099', '#CC00CC', '#CC00FF', '#CC3300', '#CC3333', '#CC3366', '#CC3399', '#CC33CC', '#CC33FF', '#CC6600', '#CC6633', '#CC9900', '#CC9933', '#CCCC00', '#CCCC33', '#FF0000', '#FF0033', '#FF0066', '#FF0099', '#FF00CC', '#FF00FF', '#FF3300', '#FF3333', '#FF3366', '#FF3399', '#FF33CC', '#FF33FF', '#FF6600', '#FF6633', '#FF9900', '#FF9933', '#FFCC00', '#FFCC33'];\n/**\n * Currently only WebKit-based Web Inspectors, Firefox >= v31,\n * and the Firebug extension (any Firefox version) are known\n * to support \"%c\" CSS customizations.\n *\n * TODO: add a `localStorage` variable to explicitly enable/disable colors\n */\n// eslint-disable-next-line complexity\n\nfunction useColors() {\n  // NB: In an Electron preload script, document will be defined but not fully\n  // initialized. Since we know we're in Chrome, we'll just detect this case\n  // explicitly\n  if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {\n    return true;\n  } // Internet Explorer and Edge do not support colors.\n\n\n  if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\\/(\\d+)/)) {\n    return false;\n  } // Is webkit? http://stackoverflow.com/a/16459606/376773\n  // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632\n\n\n  return typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance || // Is firebug? http://stackoverflow.com/a/398120/376773\n  typeof window !== 'undefined' && window.console && (window.console.firebug || window.console.exception && window.console.table) || // Is firefox >= v31?\n  // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages\n  typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\\/(\\d+)/) && parseInt(RegExp.$1, 10) >= 31 || // Double check webkit in userAgent just in case we are in a worker\n  typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\\/(\\d+)/);\n}\n/**\n * Colorize log arguments if enabled.\n *\n * @api public\n */\n\n\nfunction formatArgs(args) {\n  args[0] = (this.useColors ? '%c' : '') + this.namespace + (this.useColors ? ' %c' : ' ') + args[0] + (this.useColors ? 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-eval("function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.\"); }\n\nfunction _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === \"string\") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === \"Object\" && o.constructor) n = o.constructor.name; if (n === \"Map\" || n === \"Set\") return Array.from(o); if (n === \"Arguments\" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }\n\nfunction _iterableToArray(iter) { if (typeof Symbol !== \"undefined\" && Symbol.iterator in Object(iter)) return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); }\n\nfunction _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }\n\n/**\n * This is the common logic for both the Node.js and web browser\n * implementations of `debug()`.\n */\nfunction setup(env) {\n  createDebug.debug = createDebug;\n  createDebug[\"default\"] = createDebug;\n  createDebug.coerce = coerce;\n  createDebug.disable = disable;\n  createDebug.enable = enable;\n  createDebug.enabled = enabled;\n  createDebug.humanize = __webpack_require__(/*! ms */ \"./node_modules/ms/index.js\");\n  createDebug.destroy = destroy;\n  Object.keys(env).forEach(function (key) {\n    createDebug[key] = env[key];\n  });\n  /**\n  * The currently active debug mode names, and names to skip.\n  */\n\n  createDebug.names = [];\n  createDebug.skips = [];\n  /**\n  * Map of special \"%n\" handling functions, for the debug \"format\" argument.\n  *\n  * Valid key names are a single, lower or upper-case letter, i.e. \"n\" and \"N\".\n  */\n\n  createDebug.formatters = {};\n  /**\n  * Selects a color for a debug namespace\n  * @param {String} namespace The namespace string for the for the debug instance to be colored\n  * @return {Number|String} An ANSI color code for the given namespace\n  * @api private\n  */\n\n  function selectColor(namespace) {\n    var hash = 0;\n\n    for (var i = 0; i < namespace.length; i++) {\n      hash = (hash << 5) - hash + namespace.charCodeAt(i);\n      hash |= 0; // Convert to 32bit integer\n    }\n\n    return createDebug.colors[Math.abs(hash) % createDebug.colors.length];\n  }\n\n  createDebug.selectColor = selectColor;\n  /**\n  * Create a debugger with the given `namespace`.\n  *\n  * @param {String} namespace\n  * @return {Function}\n  * @api public\n  */\n\n  function createDebug(namespace) {\n    var prevTime;\n    var enableOverride = null;\n\n    function debug() {\n      for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n        args[_key] = arguments[_key];\n      }\n\n      // Disabled?\n      if (!debug.enabled) {\n        return;\n      }\n\n      var self = debug; // Set `diff` timestamp\n\n      var curr = Number(new Date());\n      var ms = curr - (prevTime || curr);\n      self.diff = ms;\n      self.prev = prevTime;\n      self.curr = curr;\n      prevTime = curr;\n      args[0] = createDebug.coerce(args[0]);\n\n      if (typeof args[0] !== 'string') {\n        // Anything else let's inspect with %O\n        args.unshift('%O');\n      } // Apply any `formatters` transformations\n\n\n      var index = 0;\n      args[0] = args[0].replace(/%([a-zA-Z%])/g, function (match, format) {\n        // If we encounter an escaped % then don't increase the array index\n        if (match === '%%') {\n          return '%';\n        }\n\n        index++;\n        var formatter = createDebug.formatters[format];\n\n        if (typeof formatter === 'function') {\n          var val = args[index];\n          match = formatter.call(self, val); // Now we need to remove `args[index]` since it's inlined in the `format`\n\n          args.splice(index, 1);\n          index--;\n        }\n\n        return match;\n      }); // Apply env-specific formatting (colors, etc.)\n\n      createDebug.formatArgs.call(self, args);\n      var logFn = self.log || createDebug.log;\n      logFn.apply(self, args);\n    }\n\n    debug.namespace = namespace;\n    debug.useColors = createDebug.useColors();\n    debug.color = createDebug.selectColor(namespace);\n    debug.extend = extend;\n    debug.destroy = createDebug.destroy; // XXX Temporary. Will be removed in the next major release.\n\n    Object.defineProperty(debug, 'enabled', {\n      enumerable: true,\n      configurable: false,\n      get: function get() {\n        return enableOverride === null ? createDebug.enabled(namespace) : enableOverride;\n      },\n      set: function set(v) {\n        enableOverride = v;\n      }\n    }); // Env-specific initialization logic for debug instances\n\n    if (typeof createDebug.init === 'function') {\n      createDebug.init(debug);\n    }\n\n    return debug;\n  }\n\n  function extend(namespace, delimiter) {\n    var newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);\n    newDebug.log = this.log;\n    return newDebug;\n  }\n  /**\n  * Enables a debug mode by namespaces. 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This is a temporary stub function.\n  * XXX It WILL be removed in the next major release.\n  */\n\n\n  function destroy() {\n    console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');\n  }\n\n  createDebug.enable(createDebug.load());\n  return createDebug;\n}\n\nmodule.exports = setup;\n\n//# sourceURL=webpack://eio/./node_modules/debug/src/common.js?");
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-eval("var PACKET_TYPES = Object.create(null); // no Map = no polyfill\n\nPACKET_TYPES[\"open\"] = \"0\";\nPACKET_TYPES[\"close\"] = \"1\";\nPACKET_TYPES[\"ping\"] = \"2\";\nPACKET_TYPES[\"pong\"] = \"3\";\nPACKET_TYPES[\"message\"] = \"4\";\nPACKET_TYPES[\"upgrade\"] = \"5\";\nPACKET_TYPES[\"noop\"] = \"6\";\nvar PACKET_TYPES_REVERSE = Object.create(null);\nObject.keys(PACKET_TYPES).forEach(function (key) {\n  PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;\n});\nvar ERROR_PACKET = {\n  type: \"error\",\n  data: \"parser error\"\n};\nmodule.exports = {\n  PACKET_TYPES: PACKET_TYPES,\n  PACKET_TYPES_REVERSE: PACKET_TYPES_REVERSE,\n  ERROR_PACKET: ERROR_PACKET\n};\n\n//# sourceURL=webpack://eio/./node_modules/engine.io-parser/lib/commons.js?");
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-eval("var _require = __webpack_require__(/*! ./commons */ \"./node_modules/engine.io-parser/lib/commons.js\"),\n    PACKET_TYPES_REVERSE = _require.PACKET_TYPES_REVERSE,\n    ERROR_PACKET = _require.ERROR_PACKET;\n\nvar withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\nvar base64decoder;\n\nif (withNativeArrayBuffer) {\n  base64decoder = __webpack_require__(/*! base64-arraybuffer */ \"./node_modules/base64-arraybuffer/lib/base64-arraybuffer.js\");\n}\n\nvar decodePacket = function decodePacket(encodedPacket, binaryType) {\n  if (typeof encodedPacket !== \"string\") {\n    return {\n      type: \"message\",\n      data: mapBinary(encodedPacket, binaryType)\n    };\n  }\n\n  var type = encodedPacket.charAt(0);\n\n  if (type === \"b\") {\n    return {\n      type: \"message\",\n      data: decodeBase64Packet(encodedPacket.substring(1), binaryType)\n    };\n  }\n\n  var packetType = PACKET_TYPES_REVERSE[type];\n\n  if (!packetType) {\n    return ERROR_PACKET;\n  }\n\n  return encodedPacket.length > 1 ? {\n    type: PACKET_TYPES_REVERSE[type],\n    data: encodedPacket.substring(1)\n  } : {\n    type: PACKET_TYPES_REVERSE[type]\n  };\n};\n\nvar decodeBase64Packet = function decodeBase64Packet(data, binaryType) {\n  if (base64decoder) {\n    var decoded = base64decoder.decode(data);\n    return mapBinary(decoded, binaryType);\n  } else {\n    return {\n      base64: true,\n      data: data\n    }; // fallback for old browsers\n  }\n};\n\nvar mapBinary = function mapBinary(data, binaryType) {\n  switch (binaryType) {\n    case \"blob\":\n      return data instanceof ArrayBuffer ? new Blob([data]) : data;\n\n    case \"arraybuffer\":\n    default:\n      return data;\n    // assuming the data is already an ArrayBuffer\n  }\n};\n\nmodule.exports = decodePacket;\n\n//# sourceURL=webpack://eio/./node_modules/engine.io-parser/lib/decodePacket.browser.js?");
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-eval("var _require = __webpack_require__(/*! ./commons */ \"./node_modules/engine.io-parser/lib/commons.js\"),\n    PACKET_TYPES = _require.PACKET_TYPES;\n\nvar withNativeBlob = typeof Blob === \"function\" || typeof Blob !== \"undefined\" && Object.prototype.toString.call(Blob) === \"[object BlobConstructor]\";\nvar withNativeArrayBuffer = typeof ArrayBuffer === \"function\"; // ArrayBuffer.isView method is not defined in IE10\n\nvar isView = function isView(obj) {\n  return typeof ArrayBuffer.isView === \"function\" ? ArrayBuffer.isView(obj) : obj && obj.buffer instanceof ArrayBuffer;\n};\n\nvar encodePacket = function encodePacket(_ref, supportsBinary, callback) {\n  var type = _ref.type,\n      data = _ref.data;\n\n  if (withNativeBlob && data instanceof Blob) {\n    if (supportsBinary) {\n      return callback(data);\n    } else {\n      return encodeBlobAsBase64(data, callback);\n    }\n  } else if (withNativeArrayBuffer && (data instanceof ArrayBuffer || isView(data))) {\n    if (supportsBinary) {\n      return callback(data instanceof ArrayBuffer ? data : data.buffer);\n    } else {\n      return encodeBlobAsBase64(new Blob([data]), callback);\n    }\n  } // plain string\n\n\n  return callback(PACKET_TYPES[type] + (data || \"\"));\n};\n\nvar encodeBlobAsBase64 = function encodeBlobAsBase64(data, callback) {\n  var fileReader = new FileReader();\n\n  fileReader.onload = function () {\n    var content = fileReader.result.split(\",\")[1];\n    callback(\"b\" + content);\n  };\n\n  return fileReader.readAsDataURL(data);\n};\n\nmodule.exports = encodePacket;\n\n//# sourceURL=webpack://eio/./node_modules/engine.io-parser/lib/encodePacket.browser.js?");
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-eval("function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\n/**\n * Helpers.\n */\nvar s = 1000;\nvar m = s * 60;\nvar h = m * 60;\nvar d = h * 24;\nvar w = d * 7;\nvar y = d * 365.25;\n/**\n * Parse or format the given `val`.\n *\n * Options:\n *\n *  - `long` verbose formatting [false]\n *\n * @param {String|Number} val\n * @param {Object} [options]\n * @throws {Error} throw an error if val is not a non-empty string or a number\n * @return {String|Number}\n * @api public\n */\n\nmodule.exports = function (val, options) {\n  options = options || {};\n\n  var type = _typeof(val);\n\n  if (type === 'string' && val.length > 0) {\n    return parse(val);\n  } else if (type === 'number' && isFinite(val)) {\n    return options[\"long\"] ? fmtLong(val) : fmtShort(val);\n  }\n\n  throw new Error('val is not a non-empty string or a valid number. val=' + JSON.stringify(val));\n};\n/**\n * Parse the given `str` and return milliseconds.\n *\n * @param {String} str\n * @return {Number}\n * @api private\n */\n\n\nfunction parse(str) {\n  str = String(str);\n\n  if (str.length > 100) {\n    return;\n  }\n\n  var match = /^(-?(?:\\d+)?\\.?\\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(str);\n\n  if (!match) {\n    return;\n  }\n\n  var n = parseFloat(match[1]);\n  var type = (match[2] || 'ms').toLowerCase();\n\n  switch (type) {\n    case 'years':\n    case 'year':\n    case 'yrs':\n    case 'yr':\n    case 'y':\n      return n * y;\n\n    case 'weeks':\n    case 'week':\n    case 'w':\n      return n * w;\n\n    case 'days':\n    case 'day':\n    case 'd':\n      return n * d;\n\n    case 'hours':\n    case 'hour':\n    case 'hrs':\n    case 'hr':\n    case 'h':\n      return n * h;\n\n    case 'minutes':\n    case 'minute':\n    case 'mins':\n    case 'min':\n    case 'm':\n      return n * m;\n\n    case 'seconds':\n    case 'second':\n    case 'secs':\n    case 'sec':\n    case 's':\n      return n * s;\n\n    case 'milliseconds':\n    case 'millisecond':\n    case 'msecs':\n    case 'msec':\n    case 'ms':\n      return n;\n\n    default:\n      return undefined;\n  }\n}\n/**\n * Short format for `ms`.\n *\n * @param {Number} ms\n * @return {String}\n * @api private\n */\n\n\nfunction fmtShort(ms) {\n  var msAbs = Math.abs(ms);\n\n  if (msAbs >= d) {\n    return Math.round(ms / d) + 'd';\n  }\n\n  if (msAbs >= h) {\n    return Math.round(ms / h) + 'h';\n  }\n\n  if (msAbs >= m) {\n    return Math.round(ms / m) + 'm';\n  }\n\n  if (msAbs >= s) {\n    return Math.round(ms / s) + 's';\n  }\n\n  return ms + 'ms';\n}\n/**\n * Long format for `ms`.\n *\n * @param {Number} ms\n * @return {String}\n * @api private\n */\n\n\nfunction fmtLong(ms) {\n  var msAbs = Math.abs(ms);\n\n  if (msAbs >= d) {\n    return plural(ms, msAbs, d, 'day');\n  }\n\n  if (msAbs >= h) {\n    return plural(ms, msAbs, h, 'hour');\n  }\n\n  if (msAbs >= m) {\n    return plural(ms, msAbs, m, 'minute');\n  }\n\n  if (msAbs >= s) {\n    return plural(ms, msAbs, s, 'second');\n  }\n\n  return ms + ' ms';\n}\n/**\n * Pluralization helper.\n */\n\n\nfunction plural(ms, msAbs, n, name) {\n  var isPlural = msAbs >= n * 1.5;\n  return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : '');\n}\n\n//# sourceURL=webpack://eio/./node_modules/ms/index.js?");
-
-/***/ }),
-
-/***/ "./node_modules/parseqs/index.js":
-/*!***************************************!*\
-  !*** ./node_modules/parseqs/index.js ***!
-  \***************************************/
-/*! no static exports found */
-/***/ (function(module, exports) {
-
-eval("/**\n * Compiles a querystring\n * Returns string representation of the object\n *\n * @param {Object}\n * @api private\n */\nexports.encode = function (obj) {\n  var str = '';\n\n  for (var i in obj) {\n    if (obj.hasOwnProperty(i)) {\n      if (str.length) str += '&';\n      str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);\n    }\n  }\n\n  return str;\n};\n/**\n * Parses a simple querystring into an object\n *\n * @param {String} qs\n * @api private\n */\n\n\nexports.decode = function (qs) {\n  var qry = {};\n  var pairs = qs.split('&');\n\n  for (var i = 0, l = pairs.length; i < l; i++) {\n    var pair = pairs[i].split('=');\n    qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);\n  }\n\n  return qry;\n};\n\n//# sourceURL=webpack://eio/./node_modules/parseqs/index.js?");
-
-/***/ }),
-
-/***/ "./node_modules/parseuri/index.js":
-/*!****************************************!*\
-  !*** ./node_modules/parseuri/index.js ***!
-  \****************************************/
-/*! no static exports found */
-/***/ (function(module, exports) {
-
-eval("/**\n * Parses an URI\n *\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\n * @api private\n */\nvar re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\nvar parts = ['source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'];\n\nmodule.exports = function parseuri(str) {\n  var src = str,\n      b = str.indexOf('['),\n      e = str.indexOf(']');\n\n  if (b != -1 && e != -1) {\n    str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n  }\n\n  var m = re.exec(str || ''),\n      uri = {},\n      i = 14;\n\n  while (i--) {\n    uri[parts[i]] = m[i] || '';\n  }\n\n  if (b != -1 && e != -1) {\n    uri.source = src;\n    uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n    uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n    uri.ipv6uri = true;\n  }\n\n  uri.pathNames = pathNames(uri, uri['path']);\n  uri.queryKey = queryKey(uri, uri['query']);\n  return uri;\n};\n\nfunction pathNames(obj, path) {\n  var regx = /\\/{2,9}/g,\n      names = path.replace(regx, \"/\").split(\"/\");\n\n  if (path.substr(0, 1) == '/' || path.length === 0) {\n    names.splice(0, 1);\n  }\n\n  if (path.substr(path.length - 1, 1) == '/') {\n    names.splice(names.length - 1, 1);\n  }\n\n  return names;\n}\n\nfunction queryKey(uri, query) {\n  var data = {};\n  query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {\n    if ($1) {\n      data[$1] = $2;\n    }\n  });\n  return data;\n}\n\n//# sourceURL=webpack://eio/./node_modules/parseuri/index.js?");
-
-/***/ }),
-
-/***/ "./node_modules/yeast/index.js":
-/*!*************************************!*\
-  !*** ./node_modules/yeast/index.js ***!
-  \*************************************/
-/*! no static exports found */
-/***/ (function(module, exports, __webpack_require__) {
-
-"use strict";
-eval("\n\nvar alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split(''),\n    length = 64,\n    map = {},\n    seed = 0,\n    i = 0,\n    prev;\n/**\n * Return a string representing the specified number.\n *\n * @param {Number} num The number to convert.\n * @returns {String} The string representation of the number.\n * @api public\n */\n\nfunction encode(num) {\n  var encoded = '';\n\n  do {\n    encoded = alphabet[num % length] + encoded;\n    num = Math.floor(num / length);\n  } while (num > 0);\n\n  return encoded;\n}\n/**\n * Return the integer value specified by the given string.\n *\n * @param {String} str The string to convert.\n * @returns {Number} The integer value represented by the string.\n * @api public\n */\n\n\nfunction decode(str) {\n  var decoded = 0;\n\n  for (i = 0; i < str.length; i++) {\n    decoded = decoded * length + map[str.charAt(i)];\n  }\n\n  return decoded;\n}\n/**\n * Yeast: A tiny growing id generator.\n *\n * @returns {String} A unique id.\n * @api public\n */\n\n\nfunction yeast() {\n  var now = encode(+new Date());\n  if (now !== prev) return seed = 0, prev = now;\n  return now + '.' + encode(seed++);\n} //\n// Map each character to its index.\n//\n\n\nfor (; i < length; i++) {\n  map[alphabet[i]] = i;\n} //\n// Expose the `yeast`, `encode` and `decode` functions.\n//\n\n\nyeast.encode = encode;\nyeast.decode = decode;\nmodule.exports = yeast;\n\n//# sourceURL=webpack://eio/./node_modules/yeast/index.js?");
-
-/***/ })
-
-/******/ });
-});
\ No newline at end of file
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.eio = factory());
+})(this, (function () { 'use strict';
+
+  function _typeof(obj) {
+    "@babel/helpers - typeof";
+
+    if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
+      _typeof = function (obj) {
+        return typeof obj;
+      };
+    } else {
+      _typeof = function (obj) {
+        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+      };
+    }
+
+    return _typeof(obj);
+  }
+
+  function _classCallCheck(instance, Constructor) {
+    if (!(instance instanceof Constructor)) {
+      throw new TypeError("Cannot call a class as a function");
+    }
+  }
+
+  function _defineProperties(target, props) {
+    for (var i = 0; i < props.length; i++) {
+      var descriptor = props[i];
+      descriptor.enumerable = descriptor.enumerable || false;
+      descriptor.configurable = true;
+      if ("value" in descriptor) descriptor.writable = true;
+      Object.defineProperty(target, descriptor.key, descriptor);
+    }
+  }
+
+  function _createClass(Constructor, protoProps, staticProps) {
+    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+    if (staticProps) _defineProperties(Constructor, staticProps);
+    return Constructor;
+  }
+
+  function _extends() {
+    _extends = Object.assign || function (target) {
+      for (var i = 1; i < arguments.length; i++) {
+        var source = arguments[i];
+
+        for (var key in source) {
+          if (Object.prototype.hasOwnProperty.call(source, key)) {
+            target[key] = source[key];
+          }
+        }
+      }
+
+      return target;
+    };
+
+    return _extends.apply(this, arguments);
+  }
+
+  function _inherits(subClass, superClass) {
+    if (typeof superClass !== "function" && superClass !== null) {
+      throw new TypeError("Super expression must either be null or a function");
+    }
+
+    subClass.prototype = Object.create(superClass && superClass.prototype, {
+      constructor: {
+        value: subClass,
+        writable: true,
+        configurable: true
+      }
+    });
+    if (superClass) _setPrototypeOf(subClass, superClass);
+  }
+
+  function _getPrototypeOf(o) {
+    _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
+      return o.__proto__ || Object.getPrototypeOf(o);
+    };
+    return _getPrototypeOf(o);
+  }
+
+  function _setPrototypeOf(o, p) {
+    _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
+      o.__proto__ = p;
+      return o;
+    };
+
+    return _setPrototypeOf(o, p);
+  }
+
+  function _isNativeReflectConstruct() {
+    if (typeof Reflect === "undefined" || !Reflect.construct) return false;
+    if (Reflect.construct.sham) return false;
+    if (typeof Proxy === "function") return true;
+
+    try {
+      Date.prototype.toString.call(Reflect.construct(Date, [], function () {}));
+      return true;
+    } catch (e) {
+      return false;
+    }
+  }
+
+  function _assertThisInitialized(self) {
+    if (self === void 0) {
+      throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
+    }
+
+    return self;
+  }
+
+  function _possibleConstructorReturn(self, call) {
+    if (call && (typeof call === "object" || typeof call === "function")) {
+      return call;
+    }
+
+    return _assertThisInitialized(self);
+  }
+
+  function _createSuper(Derived) {
+    var hasNativeReflectConstruct = _isNativeReflectConstruct();
+
+    return function _createSuperInternal() {
+      var Super = _getPrototypeOf(Derived),
+          result;
+
+      if (hasNativeReflectConstruct) {
+        var NewTarget = _getPrototypeOf(this).constructor;
+
+        result = Reflect.construct(Super, arguments, NewTarget);
+      } else {
+        result = Super.apply(this, arguments);
+      }
+
+      return _possibleConstructorReturn(this, result);
+    };
+  }
+
+  function _superPropBase(object, property) {
+    while (!Object.prototype.hasOwnProperty.call(object, property)) {
+      object = _getPrototypeOf(object);
+      if (object === null) break;
+    }
+
+    return object;
+  }
+
+  function _get(target, property, receiver) {
+    if (typeof Reflect !== "undefined" && Reflect.get) {
+      _get = Reflect.get;
+    } else {
+      _get = function _get(target, property, receiver) {
+        var base = _superPropBase(target, property);
+
+        if (!base) return;
+        var desc = Object.getOwnPropertyDescriptor(base, property);
+
+        if (desc.get) {
+          return desc.get.call(receiver);
+        }
+
+        return desc.value;
+      };
+    }
+
+    return _get(target, property, receiver || target);
+  }
+
+  var hasCors = {exports: {}};
+
+  /**
+   * Module exports.
+   *
+   * Logic borrowed from Modernizr:
+   *
+   *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js
+   */
+
+  try {
+    hasCors.exports = typeof XMLHttpRequest !== 'undefined' && 'withCredentials' in new XMLHttpRequest();
+  } catch (err) {
+    // if XMLHttp support is disabled in IE then it will throw
+    // when trying to create
+    hasCors.exports = false;
+  }
+
+  var hasCORS = hasCors.exports;
+
+  var globalThis = (function () {
+    if (typeof self !== "undefined") {
+      return self;
+    } else if (typeof window !== "undefined") {
+      return window;
+    } else {
+      return Function("return this")();
+    }
+  })();
+
+  // browser shim for xmlhttprequest module
+  function XMLHttpRequest$1 (opts) {
+    var xdomain = opts.xdomain; // XMLHttpRequest can be disabled on IE
+
+    try {
+      if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
+        return new XMLHttpRequest();
+      }
+    } catch (e) {}
+
+    if (!xdomain) {
+      try {
+        return new globalThis[["Active"].concat("Object").join("X")]("Microsoft.XMLHTTP");
+      } catch (e) {}
+    }
+  }
+
+  function pick(obj) {
+    for (var _len = arguments.length, attr = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+      attr[_key - 1] = arguments[_key];
+    }
+
+    return attr.reduce(function (acc, k) {
+      if (obj.hasOwnProperty(k)) {
+        acc[k] = obj[k];
+      }
+
+      return acc;
+    }, {});
+  } // Keep a reference to the real timeout functions so they can be used when overridden
+
+  var NATIVE_SET_TIMEOUT = setTimeout;
+  var NATIVE_CLEAR_TIMEOUT = clearTimeout;
+  function installTimerFunctions(obj, opts) {
+    if (opts.useNativeTimers) {
+      obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);
+      obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);
+    } else {
+      obj.setTimeoutFn = setTimeout.bind(globalThis);
+      obj.clearTimeoutFn = clearTimeout.bind(globalThis);
+    }
+  }
+
+  /**
+   * Expose `Emitter`.
+   */
+
+  var Emitter_1 = Emitter;
+  /**
+   * Initialize a new `Emitter`.
+   *
+   * @api public
+   */
+
+  function Emitter(obj) {
+    if (obj) return mixin(obj);
+  }
+  /**
+   * Mixin the emitter properties.
+   *
+   * @param {Object} obj
+   * @return {Object}
+   * @api private
+   */
+
+
+  function mixin(obj) {
+    for (var key in Emitter.prototype) {
+      obj[key] = Emitter.prototype[key];
+    }
+
+    return obj;
+  }
+  /**
+   * Listen on the given `event` with `fn`.
+   *
+   * @param {String} event
+   * @param {Function} fn
+   * @return {Emitter}
+   * @api public
+   */
+
+
+  Emitter.prototype.on = Emitter.prototype.addEventListener = function (event, fn) {
+    this._callbacks = this._callbacks || {};
+    (this._callbacks['$' + event] = this._callbacks['$' + event] || []).push(fn);
+    return this;
+  };
+  /**
+   * Adds an `event` listener that will be invoked a single
+   * time then automatically removed.
+   *
+   * @param {String} event
+   * @param {Function} fn
+   * @return {Emitter}
+   * @api public
+   */
+
+
+  Emitter.prototype.once = function (event, fn) {
+    function on() {
+      this.off(event, on);
+      fn.apply(this, arguments);
+    }
+
+    on.fn = fn;
+    this.on(event, on);
+    return this;
+  };
+  /**
+   * Remove the given callback for `event` or all
+   * registered callbacks.
+   *
+   * @param {String} event
+   * @param {Function} fn
+   * @return {Emitter}
+   * @api public
+   */
+
+
+  Emitter.prototype.off = Emitter.prototype.removeListener = Emitter.prototype.removeAllListeners = Emitter.prototype.removeEventListener = function (event, fn) {
+    this._callbacks = this._callbacks || {}; // all
+
+    if (0 == arguments.length) {
+      this._callbacks = {};
+      return this;
+    } // specific event
+
+
+    var callbacks = this._callbacks['$' + event];
+    if (!callbacks) return this; // remove all handlers
+
+    if (1 == arguments.length) {
+      delete this._callbacks['$' + event];
+      return this;
+    } // remove specific handler
+
+
+    var cb;
+
+    for (var i = 0; i < callbacks.length; i++) {
+      cb = callbacks[i];
+
+      if (cb === fn || cb.fn === fn) {
+        callbacks.splice(i, 1);
+        break;
+      }
+    } // Remove event specific arrays for event types that no
+    // one is subscribed for to avoid memory leak.
+
+
+    if (callbacks.length === 0) {
+      delete this._callbacks['$' + event];
+    }
+
+    return this;
+  };
+  /**
+   * Emit `event` with the given args.
+   *
+   * @param {String} event
+   * @param {Mixed} ...
+   * @return {Emitter}
+   */
+
+
+  Emitter.prototype.emit = function (event) {
+    this._callbacks = this._callbacks || {};
+    var args = new Array(arguments.length - 1),
+        callbacks = this._callbacks['$' + event];
+
+    for (var i = 1; i < arguments.length; i++) {
+      args[i - 1] = arguments[i];
+    }
+
+    if (callbacks) {
+      callbacks = callbacks.slice(0);
+
+      for (var i = 0, len = callbacks.length; i < len; ++i) {
+        callbacks[i].apply(this, args);
+      }
+    }
+
+    return this;
+  }; // alias used for reserved events (protected method)
+
+
+  Emitter.prototype.emitReserved = Emitter.prototype.emit;
+  /**
+   * Return array of callbacks for `event`.
+   *
+   * @param {String} event
+   * @return {Array}
+   * @api public
+   */
+
+  Emitter.prototype.listeners = function (event) {
+    this._callbacks = this._callbacks || {};
+    return this._callbacks['$' + event] || [];
+  };
+  /**
+   * Check if this emitter has `event` handlers.
+   *
+   * @param {String} event
+   * @return {Boolean}
+   * @api public
+   */
+
+
+  Emitter.prototype.hasListeners = function (event) {
+    return !!this.listeners(event).length;
+  };
+
+  var PACKET_TYPES = Object.create(null); // no Map = no polyfill
+
+  PACKET_TYPES["open"] = "0";
+  PACKET_TYPES["close"] = "1";
+  PACKET_TYPES["ping"] = "2";
+  PACKET_TYPES["pong"] = "3";
+  PACKET_TYPES["message"] = "4";
+  PACKET_TYPES["upgrade"] = "5";
+  PACKET_TYPES["noop"] = "6";
+  var PACKET_TYPES_REVERSE = Object.create(null);
+  Object.keys(PACKET_TYPES).forEach(function (key) {
+    PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;
+  });
+  var ERROR_PACKET = {
+    type: "error",
+    data: "parser error"
+  };
+
+  var withNativeBlob = typeof Blob === "function" || typeof Blob !== "undefined" && Object.prototype.toString.call(Blob) === "[object BlobConstructor]";
+  var withNativeArrayBuffer$1 = typeof ArrayBuffer === "function"; // ArrayBuffer.isView method is not defined in IE10
+
+  var isView = function isView(obj) {
+    return typeof ArrayBuffer.isView === "function" ? ArrayBuffer.isView(obj) : obj && obj.buffer instanceof ArrayBuffer;
+  };
+
+  var encodePacket = function encodePacket(_ref, supportsBinary, callback) {
+    var type = _ref.type,
+        data = _ref.data;
+
+    if (withNativeBlob && data instanceof Blob) {
+      if (supportsBinary) {
+        return callback(data);
+      } else {
+        return encodeBlobAsBase64(data, callback);
+      }
+    } else if (withNativeArrayBuffer$1 && (data instanceof ArrayBuffer || isView(data))) {
+      if (supportsBinary) {
+        return callback(data);
+      } else {
+        return encodeBlobAsBase64(new Blob([data]), callback);
+      }
+    } // plain string
+
+
+    return callback(PACKET_TYPES[type] + (data || ""));
+  };
+
+  var encodeBlobAsBase64 = function encodeBlobAsBase64(data, callback) {
+    var fileReader = new FileReader();
+
+    fileReader.onload = function () {
+      var content = fileReader.result.split(",")[1];
+      callback("b" + content);
+    };
+
+    return fileReader.readAsDataURL(data);
+  };
+
+  /*
+   * base64-arraybuffer 1.0.1 <https://github.com/niklasvh/base64-arraybuffer>
+   * Copyright (c) 2021 Niklas von Hertzen <https://hertzen.com>
+   * Released under MIT License
+   */
+  var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; // Use a lookup table to find the index.
+
+  var lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);
+
+  for (var i$1 = 0; i$1 < chars.length; i$1++) {
+    lookup[chars.charCodeAt(i$1)] = i$1;
+  }
+
+  var decode$1 = function decode(base64) {
+    var bufferLength = base64.length * 0.75,
+        len = base64.length,
+        i,
+        p = 0,
+        encoded1,
+        encoded2,
+        encoded3,
+        encoded4;
+
+    if (base64[base64.length - 1] === '=') {
+      bufferLength--;
+
+      if (base64[base64.length - 2] === '=') {
+        bufferLength--;
+      }
+    }
+
+    var arraybuffer = new ArrayBuffer(bufferLength),
+        bytes = new Uint8Array(arraybuffer);
+
+    for (i = 0; i < len; i += 4) {
+      encoded1 = lookup[base64.charCodeAt(i)];
+      encoded2 = lookup[base64.charCodeAt(i + 1)];
+      encoded3 = lookup[base64.charCodeAt(i + 2)];
+      encoded4 = lookup[base64.charCodeAt(i + 3)];
+      bytes[p++] = encoded1 << 2 | encoded2 >> 4;
+      bytes[p++] = (encoded2 & 15) << 4 | encoded3 >> 2;
+      bytes[p++] = (encoded3 & 3) << 6 | encoded4 & 63;
+    }
+
+    return arraybuffer;
+  };
+
+  var withNativeArrayBuffer = typeof ArrayBuffer === "function";
+
+  var decodePacket = function decodePacket(encodedPacket, binaryType) {
+    if (typeof encodedPacket !== "string") {
+      return {
+        type: "message",
+        data: mapBinary(encodedPacket, binaryType)
+      };
+    }
+
+    var type = encodedPacket.charAt(0);
+
+    if (type === "b") {
+      return {
+        type: "message",
+        data: decodeBase64Packet(encodedPacket.substring(1), binaryType)
+      };
+    }
+
+    var packetType = PACKET_TYPES_REVERSE[type];
+
+    if (!packetType) {
+      return ERROR_PACKET;
+    }
+
+    return encodedPacket.length > 1 ? {
+      type: PACKET_TYPES_REVERSE[type],
+      data: encodedPacket.substring(1)
+    } : {
+      type: PACKET_TYPES_REVERSE[type]
+    };
+  };
+
+  var decodeBase64Packet = function decodeBase64Packet(data, binaryType) {
+    if (withNativeArrayBuffer) {
+      var decoded = decode$1(data);
+      return mapBinary(decoded, binaryType);
+    } else {
+      return {
+        base64: true,
+        data: data
+      }; // fallback for old browsers
+    }
+  };
+
+  var mapBinary = function mapBinary(data, binaryType) {
+    switch (binaryType) {
+      case "blob":
+        return data instanceof ArrayBuffer ? new Blob([data]) : data;
+
+      case "arraybuffer":
+      default:
+        return data;
+      // assuming the data is already an ArrayBuffer
+    }
+  };
+
+  var SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text
+
+  var encodePayload = function encodePayload(packets, callback) {
+    // some packets may be added to the array while encoding, so the initial length must be saved
+    var length = packets.length;
+    var encodedPackets = new Array(length);
+    var count = 0;
+    packets.forEach(function (packet, i) {
+      // force base64 encoding for binary packets
+      encodePacket(packet, false, function (encodedPacket) {
+        encodedPackets[i] = encodedPacket;
+
+        if (++count === length) {
+          callback(encodedPackets.join(SEPARATOR));
+        }
+      });
+    });
+  };
+
+  var decodePayload = function decodePayload(encodedPayload, binaryType) {
+    var encodedPackets = encodedPayload.split(SEPARATOR);
+    var packets = [];
+
+    for (var i = 0; i < encodedPackets.length; i++) {
+      var decodedPacket = decodePacket(encodedPackets[i], binaryType);
+      packets.push(decodedPacket);
+
+      if (decodedPacket.type === "error") {
+        break;
+      }
+    }
+
+    return packets;
+  };
+
+  var protocol = 4;
+
+  var Transport = /*#__PURE__*/function (_Emitter) {
+    _inherits(Transport, _Emitter);
+
+    var _super = _createSuper(Transport);
+
+    /**
+     * Transport abstract constructor.
+     *
+     * @param {Object} options.
+     * @api private
+     */
+    function Transport(opts) {
+      var _this;
+
+      _classCallCheck(this, Transport);
+
+      _this = _super.call(this);
+      _this.writable = false;
+      installTimerFunctions(_assertThisInitialized(_this), opts);
+      _this.opts = opts;
+      _this.query = opts.query;
+      _this.readyState = "";
+      _this.socket = opts.socket;
+      return _this;
+    }
+    /**
+     * Emits an error.
+     *
+     * @param {String} str
+     * @return {Transport} for chaining
+     * @api protected
+     */
+
+
+    _createClass(Transport, [{
+      key: "onError",
+      value: function onError(msg, desc) {
+        var err = new Error(msg); // @ts-ignore
+
+        err.type = "TransportError"; // @ts-ignore
+
+        err.description = desc;
+
+        _get(_getPrototypeOf(Transport.prototype), "emit", this).call(this, "error", err);
+
+        return this;
+      }
+      /**
+       * Opens the transport.
+       *
+       * @api public
+       */
+
+    }, {
+      key: "open",
+      value: function open() {
+        if ("closed" === this.readyState || "" === this.readyState) {
+          this.readyState = "opening";
+          this.doOpen();
+        }
+
+        return this;
+      }
+      /**
+       * Closes the transport.
+       *
+       * @api public
+       */
+
+    }, {
+      key: "close",
+      value: function close() {
+        if ("opening" === this.readyState || "open" === this.readyState) {
+          this.doClose();
+          this.onClose();
+        }
+
+        return this;
+      }
+      /**
+       * Sends multiple packets.
+       *
+       * @param {Array} packets
+       * @api public
+       */
+
+    }, {
+      key: "send",
+      value: function send(packets) {
+        if ("open" === this.readyState) {
+          this.write(packets);
+        }
+      }
+      /**
+       * Called upon open
+       *
+       * @api protected
+       */
+
+    }, {
+      key: "onOpen",
+      value: function onOpen() {
+        this.readyState = "open";
+        this.writable = true;
+
+        _get(_getPrototypeOf(Transport.prototype), "emit", this).call(this, "open");
+      }
+      /**
+       * Called with data.
+       *
+       * @param {String} data
+       * @api protected
+       */
+
+    }, {
+      key: "onData",
+      value: function onData(data) {
+        var packet = decodePacket(data, this.socket.binaryType);
+        this.onPacket(packet);
+      }
+      /**
+       * Called with a decoded packet.
+       *
+       * @api protected
+       */
+
+    }, {
+      key: "onPacket",
+      value: function onPacket(packet) {
+        _get(_getPrototypeOf(Transport.prototype), "emit", this).call(this, "packet", packet);
+      }
+      /**
+       * Called upon close.
+       *
+       * @api protected
+       */
+
+    }, {
+      key: "onClose",
+      value: function onClose() {
+        this.readyState = "closed";
+
+        _get(_getPrototypeOf(Transport.prototype), "emit", this).call(this, "close");
+      }
+    }]);
+
+    return Transport;
+  }(Emitter_1);
+
+  var alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split(''),
+      length = 64,
+      map = {},
+      seed = 0,
+      i = 0,
+      prev;
+  /**
+   * Return a string representing the specified number.
+   *
+   * @param {Number} num The number to convert.
+   * @returns {String} The string representation of the number.
+   * @api public
+   */
+
+  function encode(num) {
+    var encoded = '';
+
+    do {
+      encoded = alphabet[num % length] + encoded;
+      num = Math.floor(num / length);
+    } while (num > 0);
+
+    return encoded;
+  }
+  /**
+   * Return the integer value specified by the given string.
+   *
+   * @param {String} str The string to convert.
+   * @returns {Number} The integer value represented by the string.
+   * @api public
+   */
+
+
+  function decode(str) {
+    var decoded = 0;
+
+    for (i = 0; i < str.length; i++) {
+      decoded = decoded * length + map[str.charAt(i)];
+    }
+
+    return decoded;
+  }
+  /**
+   * Yeast: A tiny growing id generator.
+   *
+   * @returns {String} A unique id.
+   * @api public
+   */
+
+
+  function yeast() {
+    var now = encode(+new Date());
+    if (now !== prev) return seed = 0, prev = now;
+    return now + '.' + encode(seed++);
+  } //
+  // Map each character to its index.
+  //
+
+
+  for (; i < length; i++) {
+    map[alphabet[i]] = i;
+  } //
+  // Expose the `yeast`, `encode` and `decode` functions.
+  //
+
+
+  yeast.encode = encode;
+  yeast.decode = decode;
+  var yeast_1 = yeast;
+
+  var parseqs = {};
+
+  /**
+   * Compiles a querystring
+   * Returns string representation of the object
+   *
+   * @param {Object}
+   * @api private
+   */
+
+  parseqs.encode = function (obj) {
+    var str = '';
+
+    for (var i in obj) {
+      if (obj.hasOwnProperty(i)) {
+        if (str.length) str += '&';
+        str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);
+      }
+    }
+
+    return str;
+  };
+  /**
+   * Parses a simple querystring into an object
+   *
+   * @param {String} qs
+   * @api private
+   */
+
+
+  parseqs.decode = function (qs) {
+    var qry = {};
+    var pairs = qs.split('&');
+
+    for (var i = 0, l = pairs.length; i < l; i++) {
+      var pair = pairs[i].split('=');
+      qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
+    }
+
+    return qry;
+  };
+
+  var Polling = /*#__PURE__*/function (_Transport) {
+    _inherits(Polling, _Transport);
+
+    var _super = _createSuper(Polling);
+
+    function Polling() {
+      var _this;
+
+      _classCallCheck(this, Polling);
+
+      _this = _super.apply(this, arguments);
+      _this.polling = false;
+      return _this;
+    }
+    /**
+     * Transport name.
+     */
+
+
+    _createClass(Polling, [{
+      key: "doOpen",
+
+      /**
+       * Opens the socket (triggers polling). We write a PING message to determine
+       * when the transport is open.
+       *
+       * @api private
+       */
+      value: function doOpen() {
+        this.poll();
+      }
+      /**
+       * Pauses polling.
+       *
+       * @param {Function} callback upon buffers are flushed and transport is paused
+       * @api private
+       */
+
+    }, {
+      key: "pause",
+      value: function pause(onPause) {
+        var _this2 = this;
+
+        this.readyState = "pausing";
+
+        var pause = function pause() {
+          _this2.readyState = "paused";
+          onPause();
+        };
+
+        if (this.polling || !this.writable) {
+          var total = 0;
+
+          if (this.polling) {
+            total++;
+            this.once("pollComplete", function () {
+              --total || pause();
+            });
+          }
+
+          if (!this.writable) {
+            total++;
+            this.once("drain", function () {
+              --total || pause();
+            });
+          }
+        } else {
+          pause();
+        }
+      }
+      /**
+       * Starts polling cycle.
+       *
+       * @api public
+       */
+
+    }, {
+      key: "poll",
+      value: function poll() {
+        this.polling = true;
+        this.doPoll();
+        this.emit("poll");
+      }
+      /**
+       * Overloads onData to detect payloads.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onData",
+      value: function onData(data) {
+        var _this3 = this;
+
+        var callback = function callback(packet) {
+          // if its the first message we consider the transport open
+          if ("opening" === _this3.readyState && packet.type === "open") {
+            _this3.onOpen();
+          } // if its a close packet, we close the ongoing requests
+
+
+          if ("close" === packet.type) {
+            _this3.onClose();
+
+            return false;
+          } // otherwise bypass onData and handle the message
+
+
+          _this3.onPacket(packet);
+        }; // decode payload
+
+
+        decodePayload(data, this.socket.binaryType).forEach(callback); // if an event did not trigger closing
+
+        if ("closed" !== this.readyState) {
+          // if we got data we're not polling
+          this.polling = false;
+          this.emit("pollComplete");
+
+          if ("open" === this.readyState) {
+            this.poll();
+          }
+        }
+      }
+      /**
+       * For polling, send a close packet.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "doClose",
+      value: function doClose() {
+        var _this4 = this;
+
+        var close = function close() {
+          _this4.write([{
+            type: "close"
+          }]);
+        };
+
+        if ("open" === this.readyState) {
+          close();
+        } else {
+          // in case we're trying to close while
+          // handshaking is in progress (GH-164)
+          this.once("open", close);
+        }
+      }
+      /**
+       * Writes a packets payload.
+       *
+       * @param {Array} data packets
+       * @param {Function} drain callback
+       * @api private
+       */
+
+    }, {
+      key: "write",
+      value: function write(packets) {
+        var _this5 = this;
+
+        this.writable = false;
+        encodePayload(packets, function (data) {
+          _this5.doWrite(data, function () {
+            _this5.writable = true;
+
+            _this5.emit("drain");
+          });
+        });
+      }
+      /**
+       * Generates uri for connection.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "uri",
+      value: function uri() {
+        var query = this.query || {};
+        var schema = this.opts.secure ? "https" : "http";
+        var port = ""; // cache busting is forced
+
+        if (false !== this.opts.timestampRequests) {
+          query[this.opts.timestampParam] = yeast_1();
+        }
+
+        if (!this.supportsBinary && !query.sid) {
+          query.b64 = 1;
+        } // avoid port if default for schema
+
+
+        if (this.opts.port && ("https" === schema && Number(this.opts.port) !== 443 || "http" === schema && Number(this.opts.port) !== 80)) {
+          port = ":" + this.opts.port;
+        }
+
+        var encodedQuery = parseqs.encode(query);
+        var ipv6 = this.opts.hostname.indexOf(":") !== -1;
+        return schema + "://" + (ipv6 ? "[" + this.opts.hostname + "]" : this.opts.hostname) + port + this.opts.path + (encodedQuery.length ? "?" + encodedQuery : "");
+      }
+    }, {
+      key: "name",
+      get: function get() {
+        return "polling";
+      }
+    }]);
+
+    return Polling;
+  }(Transport);
+
+  /**
+   * Empty function
+   */
+
+  function empty() {}
+
+  var hasXHR2 = function () {
+    var xhr = new XMLHttpRequest$1({
+      xdomain: false
+    });
+    return null != xhr.responseType;
+  }();
+
+  var XHR = /*#__PURE__*/function (_Polling) {
+    _inherits(XHR, _Polling);
+
+    var _super = _createSuper(XHR);
+
+    /**
+     * XHR Polling constructor.
+     *
+     * @param {Object} opts
+     * @api public
+     */
+    function XHR(opts) {
+      var _this;
+
+      _classCallCheck(this, XHR);
+
+      _this = _super.call(this, opts);
+
+      if (typeof location !== "undefined") {
+        var isSSL = "https:" === location.protocol;
+        var port = location.port; // some user agents have empty `location.port`
+
+        if (!port) {
+          port = isSSL ? "443" : "80";
+        }
+
+        _this.xd = typeof location !== "undefined" && opts.hostname !== location.hostname || port !== opts.port;
+        _this.xs = opts.secure !== isSSL;
+      }
+      /**
+       * XHR supports binary
+       */
+
+
+      var forceBase64 = opts && opts.forceBase64;
+      _this.supportsBinary = hasXHR2 && !forceBase64;
+      return _this;
+    }
+    /**
+     * Creates a request.
+     *
+     * @param {String} method
+     * @api private
+     */
+
+
+    _createClass(XHR, [{
+      key: "request",
+      value: function request() {
+        var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+
+        _extends(opts, {
+          xd: this.xd,
+          xs: this.xs
+        }, this.opts);
+
+        return new Request(this.uri(), opts);
+      }
+      /**
+       * Sends data.
+       *
+       * @param {String} data to send.
+       * @param {Function} called upon flush.
+       * @api private
+       */
+
+    }, {
+      key: "doWrite",
+      value: function doWrite(data, fn) {
+        var _this2 = this;
+
+        var req = this.request({
+          method: "POST",
+          data: data
+        });
+        req.on("success", fn);
+        req.on("error", function (err) {
+          _this2.onError("xhr post error", err);
+        });
+      }
+      /**
+       * Starts a poll cycle.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "doPoll",
+      value: function doPoll() {
+        var _this3 = this;
+
+        var req = this.request();
+        req.on("data", this.onData.bind(this));
+        req.on("error", function (err) {
+          _this3.onError("xhr poll error", err);
+        });
+        this.pollXhr = req;
+      }
+    }]);
+
+    return XHR;
+  }(Polling);
+  var Request = /*#__PURE__*/function (_Emitter) {
+    _inherits(Request, _Emitter);
+
+    var _super2 = _createSuper(Request);
+
+    /**
+     * Request constructor
+     *
+     * @param {Object} options
+     * @api public
+     */
+    function Request(uri, opts) {
+      var _this4;
+
+      _classCallCheck(this, Request);
+
+      _this4 = _super2.call(this);
+      installTimerFunctions(_assertThisInitialized(_this4), opts);
+      _this4.opts = opts;
+      _this4.method = opts.method || "GET";
+      _this4.uri = uri;
+      _this4.async = false !== opts.async;
+      _this4.data = undefined !== opts.data ? opts.data : null;
+
+      _this4.create();
+
+      return _this4;
+    }
+    /**
+     * Creates the XHR object and sends the request.
+     *
+     * @api private
+     */
+
+
+    _createClass(Request, [{
+      key: "create",
+      value: function create() {
+        var _this5 = this;
+
+        var opts = pick(this.opts, "agent", "pfx", "key", "passphrase", "cert", "ca", "ciphers", "rejectUnauthorized", "autoUnref");
+        opts.xdomain = !!this.opts.xd;
+        opts.xscheme = !!this.opts.xs;
+        var xhr = this.xhr = new XMLHttpRequest$1(opts);
+
+        try {
+          xhr.open(this.method, this.uri, this.async);
+
+          try {
+            if (this.opts.extraHeaders) {
+              xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);
+
+              for (var i in this.opts.extraHeaders) {
+                if (this.opts.extraHeaders.hasOwnProperty(i)) {
+                  xhr.setRequestHeader(i, this.opts.extraHeaders[i]);
+                }
+              }
+            }
+          } catch (e) {}
+
+          if ("POST" === this.method) {
+            try {
+              xhr.setRequestHeader("Content-type", "text/plain;charset=UTF-8");
+            } catch (e) {}
+          }
+
+          try {
+            xhr.setRequestHeader("Accept", "*/*");
+          } catch (e) {} // ie6 check
+
+
+          if ("withCredentials" in xhr) {
+            xhr.withCredentials = this.opts.withCredentials;
+          }
+
+          if (this.opts.requestTimeout) {
+            xhr.timeout = this.opts.requestTimeout;
+          }
+
+          xhr.onreadystatechange = function () {
+            if (4 !== xhr.readyState) return;
+
+            if (200 === xhr.status || 1223 === xhr.status) {
+              _this5.onLoad();
+            } else {
+              // make sure the `error` event handler that's user-set
+              // does not throw in the same tick and gets caught here
+              _this5.setTimeoutFn(function () {
+                _this5.onError(typeof xhr.status === "number" ? xhr.status : 0);
+              }, 0);
+            }
+          };
+
+          xhr.send(this.data);
+        } catch (e) {
+          // Need to defer since .create() is called directly from the constructor
+          // and thus the 'error' event can only be only bound *after* this exception
+          // occurs.  Therefore, also, we cannot throw here at all.
+          this.setTimeoutFn(function () {
+            _this5.onError(e);
+          }, 0);
+          return;
+        }
+
+        if (typeof document !== "undefined") {
+          this.index = Request.requestsCount++;
+          Request.requests[this.index] = this;
+        }
+      }
+      /**
+       * Called upon successful response.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onSuccess",
+      value: function onSuccess() {
+        this.emit("success");
+        this.cleanup();
+      }
+      /**
+       * Called if we have data.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onData",
+      value: function onData(data) {
+        this.emit("data", data);
+        this.onSuccess();
+      }
+      /**
+       * Called upon error.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onError",
+      value: function onError(err) {
+        this.emit("error", err);
+        this.cleanup(true);
+      }
+      /**
+       * Cleans up house.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "cleanup",
+      value: function cleanup(fromError) {
+        if ("undefined" === typeof this.xhr || null === this.xhr) {
+          return;
+        }
+
+        this.xhr.onreadystatechange = empty;
+
+        if (fromError) {
+          try {
+            this.xhr.abort();
+          } catch (e) {}
+        }
+
+        if (typeof document !== "undefined") {
+          delete Request.requests[this.index];
+        }
+
+        this.xhr = null;
+      }
+      /**
+       * Called upon load.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onLoad",
+      value: function onLoad() {
+        var data = this.xhr.responseText;
+
+        if (data !== null) {
+          this.onData(data);
+        }
+      }
+      /**
+       * Aborts the request.
+       *
+       * @api public
+       */
+
+    }, {
+      key: "abort",
+      value: function abort() {
+        this.cleanup();
+      }
+    }]);
+
+    return Request;
+  }(Emitter_1);
+  Request.requestsCount = 0;
+  Request.requests = {};
+  /**
+   * Aborts pending requests when unloading the window. This is needed to prevent
+   * memory leaks (e.g. when using IE) and to ensure that no spurious error is
+   * emitted.
+   */
+
+  if (typeof document !== "undefined") {
+    // @ts-ignore
+    if (typeof attachEvent === "function") {
+      // @ts-ignore
+      attachEvent("onunload", unloadHandler);
+    } else if (typeof addEventListener === "function") {
+      var terminationEvent = "onpagehide" in globalThis ? "pagehide" : "unload";
+      addEventListener(terminationEvent, unloadHandler, false);
+    }
+  }
+
+  function unloadHandler() {
+    for (var i in Request.requests) {
+      if (Request.requests.hasOwnProperty(i)) {
+        Request.requests[i].abort();
+      }
+    }
+  }
+
+  var nextTick = function () {
+    var isPromiseAvailable = typeof Promise === "function" && typeof Promise.resolve === "function";
+
+    if (isPromiseAvailable) {
+      return function (cb) {
+        return Promise.resolve().then(cb);
+      };
+    } else {
+      return function (cb, setTimeoutFn) {
+        return setTimeoutFn(cb, 0);
+      };
+    }
+  }();
+  var WebSocket = globalThis.WebSocket || globalThis.MozWebSocket;
+  var usingBrowserWebSocket = true;
+  var defaultBinaryType = "arraybuffer";
+
+  var isReactNative = typeof navigator !== "undefined" && typeof navigator.product === "string" && navigator.product.toLowerCase() === "reactnative";
+  var WS = /*#__PURE__*/function (_Transport) {
+    _inherits(WS, _Transport);
+
+    var _super = _createSuper(WS);
+
+    /**
+     * WebSocket transport constructor.
+     *
+     * @api {Object} connection options
+     * @api public
+     */
+    function WS(opts) {
+      var _this;
+
+      _classCallCheck(this, WS);
+
+      _this = _super.call(this, opts);
+      _this.supportsBinary = !opts.forceBase64;
+      return _this;
+    }
+    /**
+     * Transport name.
+     *
+     * @api public
+     */
+
+
+    _createClass(WS, [{
+      key: "doOpen",
+
+      /**
+       * Opens socket.
+       *
+       * @api private
+       */
+      value: function doOpen() {
+        if (!this.check()) {
+          // let probe timeout
+          return;
+        }
+
+        var uri = this.uri();
+        var protocols = this.opts.protocols; // React Native only supports the 'headers' option, and will print a warning if anything else is passed
+
+        var opts = isReactNative ? {} : pick(this.opts, "agent", "perMessageDeflate", "pfx", "key", "passphrase", "cert", "ca", "ciphers", "rejectUnauthorized", "localAddress", "protocolVersion", "origin", "maxPayload", "family", "checkServerIdentity");
+
+        if (this.opts.extraHeaders) {
+          opts.headers = this.opts.extraHeaders;
+        }
+
+        try {
+          this.ws = usingBrowserWebSocket && !isReactNative ? protocols ? new WebSocket(uri, protocols) : new WebSocket(uri) : new WebSocket(uri, protocols, opts);
+        } catch (err) {
+          return this.emit("error", err);
+        }
+
+        this.ws.binaryType = this.socket.binaryType || defaultBinaryType;
+        this.addEventListeners();
+      }
+      /**
+       * Adds event listeners to the socket
+       *
+       * @api private
+       */
+
+    }, {
+      key: "addEventListeners",
+      value: function addEventListeners() {
+        var _this2 = this;
+
+        this.ws.onopen = function () {
+          if (_this2.opts.autoUnref) {
+            _this2.ws._socket.unref();
+          }
+
+          _this2.onOpen();
+        };
+
+        this.ws.onclose = this.onClose.bind(this);
+
+        this.ws.onmessage = function (ev) {
+          return _this2.onData(ev.data);
+        };
+
+        this.ws.onerror = function (e) {
+          return _this2.onError("websocket error", e);
+        };
+      }
+      /**
+       * Writes data to socket.
+       *
+       * @param {Array} array of packets.
+       * @api private
+       */
+
+    }, {
+      key: "write",
+      value: function write(packets) {
+        var _this3 = this;
+
+        this.writable = false; // encodePacket efficient as it uses WS framing
+        // no need for encodePayload
+
+        var _loop = function _loop(i) {
+          var packet = packets[i];
+          var lastPacket = i === packets.length - 1;
+          encodePacket(packet, _this3.supportsBinary, function (data) {
+            // always create a new object (GH-437)
+            var opts = {};
+            // have a chance of informing us about it yet, in that case send will
+            // throw an error
+
+
+            try {
+              if (usingBrowserWebSocket) {
+                // TypeError is thrown when passing the second argument on Safari
+                _this3.ws.send(data);
+              }
+            } catch (e) {}
+
+            if (lastPacket) {
+              // fake drain
+              // defer to next tick to allow Socket to clear writeBuffer
+              nextTick(function () {
+                _this3.writable = true;
+
+                _this3.emit("drain");
+              }, _this3.setTimeoutFn);
+            }
+          });
+        };
+
+        for (var i = 0; i < packets.length; i++) {
+          _loop(i);
+        }
+      }
+      /**
+       * Closes socket.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "doClose",
+      value: function doClose() {
+        if (typeof this.ws !== "undefined") {
+          this.ws.close();
+          this.ws = null;
+        }
+      }
+      /**
+       * Generates uri for connection.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "uri",
+      value: function uri() {
+        var query = this.query || {};
+        var schema = this.opts.secure ? "wss" : "ws";
+        var port = ""; // avoid port if default for schema
+
+        if (this.opts.port && ("wss" === schema && Number(this.opts.port) !== 443 || "ws" === schema && Number(this.opts.port) !== 80)) {
+          port = ":" + this.opts.port;
+        } // append timestamp to URI
+
+
+        if (this.opts.timestampRequests) {
+          query[this.opts.timestampParam] = yeast_1();
+        } // communicate binary support capabilities
+
+
+        if (!this.supportsBinary) {
+          query.b64 = 1;
+        }
+
+        var encodedQuery = parseqs.encode(query);
+        var ipv6 = this.opts.hostname.indexOf(":") !== -1;
+        return schema + "://" + (ipv6 ? "[" + this.opts.hostname + "]" : this.opts.hostname) + port + this.opts.path + (encodedQuery.length ? "?" + encodedQuery : "");
+      }
+      /**
+       * Feature detection for WebSocket.
+       *
+       * @return {Boolean} whether this transport is available.
+       * @api public
+       */
+
+    }, {
+      key: "check",
+      value: function check() {
+        return !!WebSocket && !("__initialize" in WebSocket && this.name === WS.prototype.name);
+      }
+    }, {
+      key: "name",
+      get: function get() {
+        return "websocket";
+      }
+    }]);
+
+    return WS;
+  }(Transport);
+
+  var transports = {
+    websocket: WS,
+    polling: XHR
+  };
+
+  /**
+   * Parses an URI
+   *
+   * @author Steven Levithan <stevenlevithan.com> (MIT license)
+   * @api private
+   */
+  var re = /^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;
+  var parts = ['source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'];
+
+  var parseuri = function parseuri(str) {
+    var src = str,
+        b = str.indexOf('['),
+        e = str.indexOf(']');
+
+    if (b != -1 && e != -1) {
+      str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);
+    }
+
+    var m = re.exec(str || ''),
+        uri = {},
+        i = 14;
+
+    while (i--) {
+      uri[parts[i]] = m[i] || '';
+    }
+
+    if (b != -1 && e != -1) {
+      uri.source = src;
+      uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');
+      uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');
+      uri.ipv6uri = true;
+    }
+
+    uri.pathNames = pathNames(uri, uri['path']);
+    uri.queryKey = queryKey(uri, uri['query']);
+    return uri;
+  };
+
+  function pathNames(obj, path) {
+    var regx = /\/{2,9}/g,
+        names = path.replace(regx, "/").split("/");
+
+    if (path.substr(0, 1) == '/' || path.length === 0) {
+      names.splice(0, 1);
+    }
+
+    if (path.substr(path.length - 1, 1) == '/') {
+      names.splice(names.length - 1, 1);
+    }
+
+    return names;
+  }
+
+  function queryKey(uri, query) {
+    var data = {};
+    query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {
+      if ($1) {
+        data[$1] = $2;
+      }
+    });
+    return data;
+  }
+
+  var Socket = /*#__PURE__*/function (_Emitter) {
+    _inherits(Socket, _Emitter);
+
+    var _super = _createSuper(Socket);
+
+    /**
+     * Socket constructor.
+     *
+     * @param {String|Object} uri or options
+     * @param {Object} opts - options
+     * @api public
+     */
+    function Socket(uri) {
+      var _this;
+
+      var opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+
+      _classCallCheck(this, Socket);
+
+      _this = _super.call(this);
+
+      if (uri && "object" === _typeof(uri)) {
+        opts = uri;
+        uri = null;
+      }
+
+      if (uri) {
+        uri = parseuri(uri);
+        opts.hostname = uri.host;
+        opts.secure = uri.protocol === "https" || uri.protocol === "wss";
+        opts.port = uri.port;
+        if (uri.query) opts.query = uri.query;
+      } else if (opts.host) {
+        opts.hostname = parseuri(opts.host).host;
+      }
+
+      installTimerFunctions(_assertThisInitialized(_this), opts);
+      _this.secure = null != opts.secure ? opts.secure : typeof location !== "undefined" && "https:" === location.protocol;
+
+      if (opts.hostname && !opts.port) {
+        // if no port is specified manually, use the protocol default
+        opts.port = _this.secure ? "443" : "80";
+      }
+
+      _this.hostname = opts.hostname || (typeof location !== "undefined" ? location.hostname : "localhost");
+      _this.port = opts.port || (typeof location !== "undefined" && location.port ? location.port : _this.secure ? "443" : "80");
+      _this.transports = opts.transports || ["polling", "websocket"];
+      _this.readyState = "";
+      _this.writeBuffer = [];
+      _this.prevBufferLen = 0;
+      _this.opts = _extends({
+        path: "/engine.io",
+        agent: false,
+        withCredentials: false,
+        upgrade: true,
+        timestampParam: "t",
+        rememberUpgrade: false,
+        rejectUnauthorized: true,
+        perMessageDeflate: {
+          threshold: 1024
+        },
+        transportOptions: {},
+        closeOnBeforeunload: true
+      }, opts);
+      _this.opts.path = _this.opts.path.replace(/\/$/, "") + "/";
+
+      if (typeof _this.opts.query === "string") {
+        _this.opts.query = parseqs.decode(_this.opts.query);
+      } // set on handshake
+
+
+      _this.id = null;
+      _this.upgrades = null;
+      _this.pingInterval = null;
+      _this.pingTimeout = null; // set on heartbeat
+
+      _this.pingTimeoutTimer = null;
+
+      if (typeof addEventListener === "function") {
+        if (_this.opts.closeOnBeforeunload) {
+          // Firefox closes the connection when the "beforeunload" event is emitted but not Chrome. This event listener
+          // ensures every browser behaves the same (no "disconnect" event at the Socket.IO level when the page is
+          // closed/reloaded)
+          addEventListener("beforeunload", function () {
+            if (_this.transport) {
+              // silently close the transport
+              _this.transport.removeAllListeners();
+
+              _this.transport.close();
+            }
+          }, false);
+        }
+
+        if (_this.hostname !== "localhost") {
+          _this.offlineEventListener = function () {
+            _this.onClose("transport close");
+          };
+
+          addEventListener("offline", _this.offlineEventListener, false);
+        }
+      }
+
+      _this.open();
+
+      return _this;
+    }
+    /**
+     * Creates transport of the given type.
+     *
+     * @param {String} transport name
+     * @return {Transport}
+     * @api private
+     */
+
+
+    _createClass(Socket, [{
+      key: "createTransport",
+      value: function createTransport(name) {
+        var query = clone(this.opts.query); // append engine.io protocol identifier
+
+        query.EIO = protocol; // transport name
+
+        query.transport = name; // session id if we already have one
+
+        if (this.id) query.sid = this.id;
+
+        var opts = _extends({}, this.opts.transportOptions[name], this.opts, {
+          query: query,
+          socket: this,
+          hostname: this.hostname,
+          secure: this.secure,
+          port: this.port
+        });
+
+        return new transports[name](opts);
+      }
+      /**
+       * Initializes transport to use and starts probe.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "open",
+      value: function open() {
+        var _this2 = this;
+
+        var transport;
+
+        if (this.opts.rememberUpgrade && Socket.priorWebsocketSuccess && this.transports.indexOf("websocket") !== -1) {
+          transport = "websocket";
+        } else if (0 === this.transports.length) {
+          // Emit error on next tick so it can be listened to
+          this.setTimeoutFn(function () {
+            _this2.emitReserved("error", "No transports available");
+          }, 0);
+          return;
+        } else {
+          transport = this.transports[0];
+        }
+
+        this.readyState = "opening"; // Retry with the next transport if the transport is disabled (jsonp: false)
+
+        try {
+          transport = this.createTransport(transport);
+        } catch (e) {
+          this.transports.shift();
+          this.open();
+          return;
+        }
+
+        transport.open();
+        this.setTransport(transport);
+      }
+      /**
+       * Sets the current transport. Disables the existing one (if any).
+       *
+       * @api private
+       */
+
+    }, {
+      key: "setTransport",
+      value: function setTransport(transport) {
+        var _this3 = this;
+
+        if (this.transport) {
+          this.transport.removeAllListeners();
+        } // set up transport
+
+
+        this.transport = transport; // set up transport listeners
+
+        transport.on("drain", this.onDrain.bind(this)).on("packet", this.onPacket.bind(this)).on("error", this.onError.bind(this)).on("close", function () {
+          _this3.onClose("transport close");
+        });
+      }
+      /**
+       * Probes a transport.
+       *
+       * @param {String} transport name
+       * @api private
+       */
+
+    }, {
+      key: "probe",
+      value: function probe(name) {
+        var _this4 = this;
+
+        var transport = this.createTransport(name);
+        var failed = false;
+        Socket.priorWebsocketSuccess = false;
+
+        var onTransportOpen = function onTransportOpen() {
+          if (failed) return;
+          transport.send([{
+            type: "ping",
+            data: "probe"
+          }]);
+          transport.once("packet", function (msg) {
+            if (failed) return;
+
+            if ("pong" === msg.type && "probe" === msg.data) {
+              _this4.upgrading = true;
+
+              _this4.emitReserved("upgrading", transport);
+
+              if (!transport) return;
+              Socket.priorWebsocketSuccess = "websocket" === transport.name;
+
+              _this4.transport.pause(function () {
+                if (failed) return;
+                if ("closed" === _this4.readyState) return;
+                cleanup();
+
+                _this4.setTransport(transport);
+
+                transport.send([{
+                  type: "upgrade"
+                }]);
+
+                _this4.emitReserved("upgrade", transport);
+
+                transport = null;
+                _this4.upgrading = false;
+
+                _this4.flush();
+              });
+            } else {
+              var err = new Error("probe error"); // @ts-ignore
+
+              err.transport = transport.name;
+
+              _this4.emitReserved("upgradeError", err);
+            }
+          });
+        };
+
+        function freezeTransport() {
+          if (failed) return; // Any callback called by transport should be ignored since now
+
+          failed = true;
+          cleanup();
+          transport.close();
+          transport = null;
+        } // Handle any error that happens while probing
+
+
+        var onerror = function onerror(err) {
+          var error = new Error("probe error: " + err); // @ts-ignore
+
+          error.transport = transport.name;
+          freezeTransport();
+
+          _this4.emitReserved("upgradeError", error);
+        };
+
+        function onTransportClose() {
+          onerror("transport closed");
+        } // When the socket is closed while we're probing
+
+
+        function onclose() {
+          onerror("socket closed");
+        } // When the socket is upgraded while we're probing
+
+
+        function onupgrade(to) {
+          if (transport && to.name !== transport.name) {
+            freezeTransport();
+          }
+        } // Remove all listeners on the transport and on self
+
+
+        var cleanup = function cleanup() {
+          transport.removeListener("open", onTransportOpen);
+          transport.removeListener("error", onerror);
+          transport.removeListener("close", onTransportClose);
+
+          _this4.off("close", onclose);
+
+          _this4.off("upgrading", onupgrade);
+        };
+
+        transport.once("open", onTransportOpen);
+        transport.once("error", onerror);
+        transport.once("close", onTransportClose);
+        this.once("close", onclose);
+        this.once("upgrading", onupgrade);
+        transport.open();
+      }
+      /**
+       * Called when connection is deemed open.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onOpen",
+      value: function onOpen() {
+        this.readyState = "open";
+        Socket.priorWebsocketSuccess = "websocket" === this.transport.name;
+        this.emitReserved("open");
+        this.flush(); // we check for `readyState` in case an `open`
+        // listener already closed the socket
+
+        if ("open" === this.readyState && this.opts.upgrade && this.transport.pause) {
+          var i = 0;
+          var l = this.upgrades.length;
+
+          for (; i < l; i++) {
+            this.probe(this.upgrades[i]);
+          }
+        }
+      }
+      /**
+       * Handles a packet.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onPacket",
+      value: function onPacket(packet) {
+        if ("opening" === this.readyState || "open" === this.readyState || "closing" === this.readyState) {
+          this.emitReserved("packet", packet); // Socket is live - any packet counts
+
+          this.emitReserved("heartbeat");
+
+          switch (packet.type) {
+            case "open":
+              this.onHandshake(JSON.parse(packet.data));
+              break;
+
+            case "ping":
+              this.resetPingTimeout();
+              this.sendPacket("pong");
+              this.emitReserved("ping");
+              this.emitReserved("pong");
+              break;
+
+            case "error":
+              var err = new Error("server error"); // @ts-ignore
+
+              err.code = packet.data;
+              this.onError(err);
+              break;
+
+            case "message":
+              this.emitReserved("data", packet.data);
+              this.emitReserved("message", packet.data);
+              break;
+          }
+        }
+      }
+      /**
+       * Called upon handshake completion.
+       *
+       * @param {Object} data - handshake obj
+       * @api private
+       */
+
+    }, {
+      key: "onHandshake",
+      value: function onHandshake(data) {
+        this.emitReserved("handshake", data);
+        this.id = data.sid;
+        this.transport.query.sid = data.sid;
+        this.upgrades = this.filterUpgrades(data.upgrades);
+        this.pingInterval = data.pingInterval;
+        this.pingTimeout = data.pingTimeout;
+        this.onOpen(); // In case open handler closes socket
+
+        if ("closed" === this.readyState) return;
+        this.resetPingTimeout();
+      }
+      /**
+       * Sets and resets ping timeout timer based on server pings.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "resetPingTimeout",
+      value: function resetPingTimeout() {
+        var _this5 = this;
+
+        this.clearTimeoutFn(this.pingTimeoutTimer);
+        this.pingTimeoutTimer = this.setTimeoutFn(function () {
+          _this5.onClose("ping timeout");
+        }, this.pingInterval + this.pingTimeout);
+
+        if (this.opts.autoUnref) {
+          this.pingTimeoutTimer.unref();
+        }
+      }
+      /**
+       * Called on `drain` event
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onDrain",
+      value: function onDrain() {
+        this.writeBuffer.splice(0, this.prevBufferLen); // setting prevBufferLen = 0 is very important
+        // for example, when upgrading, upgrade packet is sent over,
+        // and a nonzero prevBufferLen could cause problems on `drain`
+
+        this.prevBufferLen = 0;
+
+        if (0 === this.writeBuffer.length) {
+          this.emitReserved("drain");
+        } else {
+          this.flush();
+        }
+      }
+      /**
+       * Flush write buffers.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "flush",
+      value: function flush() {
+        if ("closed" !== this.readyState && this.transport.writable && !this.upgrading && this.writeBuffer.length) {
+          this.transport.send(this.writeBuffer); // keep track of current length of writeBuffer
+          // splice writeBuffer and callbackBuffer on `drain`
+
+          this.prevBufferLen = this.writeBuffer.length;
+          this.emitReserved("flush");
+        }
+      }
+      /**
+       * Sends a message.
+       *
+       * @param {String} message.
+       * @param {Function} callback function.
+       * @param {Object} options.
+       * @return {Socket} for chaining.
+       * @api public
+       */
+
+    }, {
+      key: "write",
+      value: function write(msg, options, fn) {
+        this.sendPacket("message", msg, options, fn);
+        return this;
+      }
+    }, {
+      key: "send",
+      value: function send(msg, options, fn) {
+        this.sendPacket("message", msg, options, fn);
+        return this;
+      }
+      /**
+       * Sends a packet.
+       *
+       * @param {String} packet type.
+       * @param {String} data.
+       * @param {Object} options.
+       * @param {Function} callback function.
+       * @api private
+       */
+
+    }, {
+      key: "sendPacket",
+      value: function sendPacket(type, data, options, fn) {
+        if ("function" === typeof data) {
+          fn = data;
+          data = undefined;
+        }
+
+        if ("function" === typeof options) {
+          fn = options;
+          options = null;
+        }
+
+        if ("closing" === this.readyState || "closed" === this.readyState) {
+          return;
+        }
+
+        options = options || {};
+        options.compress = false !== options.compress;
+        var packet = {
+          type: type,
+          data: data,
+          options: options
+        };
+        this.emitReserved("packetCreate", packet);
+        this.writeBuffer.push(packet);
+        if (fn) this.once("flush", fn);
+        this.flush();
+      }
+      /**
+       * Closes the connection.
+       *
+       * @api public
+       */
+
+    }, {
+      key: "close",
+      value: function close() {
+        var _this6 = this;
+
+        var close = function close() {
+          _this6.onClose("forced close");
+
+          _this6.transport.close();
+        };
+
+        var cleanupAndClose = function cleanupAndClose() {
+          _this6.off("upgrade", cleanupAndClose);
+
+          _this6.off("upgradeError", cleanupAndClose);
+
+          close();
+        };
+
+        var waitForUpgrade = function waitForUpgrade() {
+          // wait for upgrade to finish since we can't send packets while pausing a transport
+          _this6.once("upgrade", cleanupAndClose);
+
+          _this6.once("upgradeError", cleanupAndClose);
+        };
+
+        if ("opening" === this.readyState || "open" === this.readyState) {
+          this.readyState = "closing";
+
+          if (this.writeBuffer.length) {
+            this.once("drain", function () {
+              if (_this6.upgrading) {
+                waitForUpgrade();
+              } else {
+                close();
+              }
+            });
+          } else if (this.upgrading) {
+            waitForUpgrade();
+          } else {
+            close();
+          }
+        }
+
+        return this;
+      }
+      /**
+       * Called upon transport error
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onError",
+      value: function onError(err) {
+        Socket.priorWebsocketSuccess = false;
+        this.emitReserved("error", err);
+        this.onClose("transport error", err);
+      }
+      /**
+       * Called upon transport close.
+       *
+       * @api private
+       */
+
+    }, {
+      key: "onClose",
+      value: function onClose(reason, desc) {
+        if ("opening" === this.readyState || "open" === this.readyState || "closing" === this.readyState) {
+          // clear timers
+          this.clearTimeoutFn(this.pingTimeoutTimer); // stop event from firing again for transport
+
+          this.transport.removeAllListeners("close"); // ensure transport won't stay open
+
+          this.transport.close(); // ignore further transport communication
+
+          this.transport.removeAllListeners();
+
+          if (typeof removeEventListener === "function") {
+            removeEventListener("offline", this.offlineEventListener, false);
+          } // set ready state
+
+
+          this.readyState = "closed"; // clear session id
+
+          this.id = null; // emit close event
+
+          this.emitReserved("close", reason, desc); // clean buffers after, so users can still
+          // grab the buffers on `close` event
+
+          this.writeBuffer = [];
+          this.prevBufferLen = 0;
+        }
+      }
+      /**
+       * Filters upgrades, returning only those matching client transports.
+       *
+       * @param {Array} server upgrades
+       * @api private
+       *
+       */
+
+    }, {
+      key: "filterUpgrades",
+      value: function filterUpgrades(upgrades) {
+        var filteredUpgrades = [];
+        var i = 0;
+        var j = upgrades.length;
+
+        for (; i < j; i++) {
+          if (~this.transports.indexOf(upgrades[i])) filteredUpgrades.push(upgrades[i]);
+        }
+
+        return filteredUpgrades;
+      }
+    }]);
+
+    return Socket;
+  }(Emitter_1);
+  Socket.protocol = protocol;
+
+  function clone(obj) {
+    var o = {};
+
+    for (var i in obj) {
+      if (obj.hasOwnProperty(i)) {
+        o[i] = obj[i];
+      }
+    }
+
+    return o;
+  }
+
+  var browserEntrypoint = (function (uri, opts) {
+    return new Socket(uri, opts);
+  });
+
+  return browserEntrypoint;
+
+}));
+//# sourceMappingURL=engine.io.js.map
diff --git a/dist/engine.io.js.map b/dist/engine.io.js.map
new file mode 100644
index 000000000..a54b5b546
--- /dev/null
+++ b/dist/engine.io.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"engine.io.js","sources":["../node_modules/has-cors/index.js","../build/esm/globalThis.browser.js","../build/esm/transports/xmlhttprequest.browser.js","../build/esm/util.js","../node_modules/@socket.io/component-emitter/index.js","../node_modules/engine.io-parser/build/esm/commons.js","../node_modules/engine.io-parser/build/esm/encodePacket.browser.js","../node_modules/base64-arraybuffer/dist/base64-arraybuffer.es5.js","../node_modules/engine.io-parser/build/esm/decodePacket.browser.js","../node_modules/engine.io-parser/build/esm/index.js","../build/esm/transport.js","../node_modules/yeast/index.js","../node_modules/parseqs/index.js","../build/esm/transports/polling.js","../build/esm/transports/polling-xhr.js","../build/esm/transports/websocket-constructor.browser.js","../build/esm/transports/websocket.js","../build/esm/transports/index.js","../node_modules/parseuri/index.js","../build/esm/socket.js","../build/esm/browser-entrypoint.js"],"sourcesContent":["\n/**\n * Module exports.\n *\n * Logic borrowed from Modernizr:\n *\n *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js\n */\n\ntry {\n  module.exports = typeof XMLHttpRequest !== 'undefined' &&\n    'withCredentials' in new XMLHttpRequest();\n} catch (err) {\n  // if XMLHttp support is disabled in IE then it will throw\n  // when trying to create\n  module.exports = false;\n}\n","export default (() => {\n    if (typeof self !== \"undefined\") {\n        return self;\n    }\n    else if (typeof window !== \"undefined\") {\n        return window;\n    }\n    else {\n        return Function(\"return this\")();\n    }\n})();\n","// browser shim for xmlhttprequest module\nimport hasCORS from \"has-cors\";\nimport globalThis from \"../globalThis.js\";\nexport default function (opts) {\n    const xdomain = opts.xdomain;\n    // XMLHttpRequest can be disabled on IE\n    try {\n        if (\"undefined\" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {\n            return new XMLHttpRequest();\n        }\n    }\n    catch (e) { }\n    if (!xdomain) {\n        try {\n            return new globalThis[[\"Active\"].concat(\"Object\").join(\"X\")](\"Microsoft.XMLHTTP\");\n        }\n        catch (e) { }\n    }\n}\n","import globalThis from \"./globalThis.js\";\nexport function pick(obj, ...attr) {\n    return attr.reduce((acc, k) => {\n        if (obj.hasOwnProperty(k)) {\n            acc[k] = obj[k];\n        }\n        return acc;\n    }, {});\n}\n// Keep a reference to the real timeout functions so they can be used when overridden\nconst NATIVE_SET_TIMEOUT = setTimeout;\nconst NATIVE_CLEAR_TIMEOUT = clearTimeout;\nexport function installTimerFunctions(obj, opts) {\n    if (opts.useNativeTimers) {\n        obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);\n        obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);\n    }\n    else {\n        obj.setTimeoutFn = setTimeout.bind(globalThis);\n        obj.clearTimeoutFn = clearTimeout.bind(globalThis);\n    }\n}\n","\n/**\n * Expose `Emitter`.\n */\n\nexports.Emitter = Emitter;\n\n/**\n * Initialize a new `Emitter`.\n *\n * @api public\n */\n\nfunction Emitter(obj) {\n  if (obj) return mixin(obj);\n}\n\n/**\n * Mixin the emitter properties.\n *\n * @param {Object} obj\n * @return {Object}\n * @api private\n */\n\nfunction mixin(obj) {\n  for (var key in Emitter.prototype) {\n    obj[key] = Emitter.prototype[key];\n  }\n  return obj;\n}\n\n/**\n * Listen on the given `event` with `fn`.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.on =\nEmitter.prototype.addEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n  (this._callbacks['$' + event] = this._callbacks['$' + event] || [])\n    .push(fn);\n  return this;\n};\n\n/**\n * Adds an `event` listener that will be invoked a single\n * time then automatically removed.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.once = function(event, fn){\n  function on() {\n    this.off(event, on);\n    fn.apply(this, arguments);\n  }\n\n  on.fn = fn;\n  this.on(event, on);\n  return this;\n};\n\n/**\n * Remove the given callback for `event` or all\n * registered callbacks.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.off =\nEmitter.prototype.removeListener =\nEmitter.prototype.removeAllListeners =\nEmitter.prototype.removeEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n\n  // all\n  if (0 == arguments.length) {\n    this._callbacks = {};\n    return this;\n  }\n\n  // specific event\n  var callbacks = this._callbacks['$' + event];\n  if (!callbacks) return this;\n\n  // remove all handlers\n  if (1 == arguments.length) {\n    delete this._callbacks['$' + event];\n    return this;\n  }\n\n  // remove specific handler\n  var cb;\n  for (var i = 0; i < callbacks.length; i++) {\n    cb = callbacks[i];\n    if (cb === fn || cb.fn === fn) {\n      callbacks.splice(i, 1);\n      break;\n    }\n  }\n\n  // Remove event specific arrays for event types that no\n  // one is subscribed for to avoid memory leak.\n  if (callbacks.length === 0) {\n    delete this._callbacks['$' + event];\n  }\n\n  return this;\n};\n\n/**\n * Emit `event` with the given args.\n *\n * @param {String} event\n * @param {Mixed} ...\n * @return {Emitter}\n */\n\nEmitter.prototype.emit = function(event){\n  this._callbacks = this._callbacks || {};\n\n  var args = new Array(arguments.length - 1)\n    , callbacks = this._callbacks['$' + event];\n\n  for (var i = 1; i < arguments.length; i++) {\n    args[i - 1] = arguments[i];\n  }\n\n  if (callbacks) {\n    callbacks = callbacks.slice(0);\n    for (var i = 0, len = callbacks.length; i < len; ++i) {\n      callbacks[i].apply(this, args);\n    }\n  }\n\n  return this;\n};\n\n// alias used for reserved events (protected method)\nEmitter.prototype.emitReserved = Emitter.prototype.emit;\n\n/**\n * Return array of callbacks for `event`.\n *\n * @param {String} event\n * @return {Array}\n * @api public\n */\n\nEmitter.prototype.listeners = function(event){\n  this._callbacks = this._callbacks || {};\n  return this._callbacks['$' + event] || [];\n};\n\n/**\n * Check if this emitter has `event` handlers.\n *\n * @param {String} event\n * @return {Boolean}\n * @api public\n */\n\nEmitter.prototype.hasListeners = function(event){\n  return !! this.listeners(event).length;\n};\n","const PACKET_TYPES = Object.create(null); // no Map = no polyfill\nPACKET_TYPES[\"open\"] = \"0\";\nPACKET_TYPES[\"close\"] = \"1\";\nPACKET_TYPES[\"ping\"] = \"2\";\nPACKET_TYPES[\"pong\"] = \"3\";\nPACKET_TYPES[\"message\"] = \"4\";\nPACKET_TYPES[\"upgrade\"] = \"5\";\nPACKET_TYPES[\"noop\"] = \"6\";\nconst PACKET_TYPES_REVERSE = Object.create(null);\nObject.keys(PACKET_TYPES).forEach(key => {\n    PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;\n});\nconst ERROR_PACKET = { type: \"error\", data: \"parser error\" };\nexport { PACKET_TYPES, PACKET_TYPES_REVERSE, ERROR_PACKET };\n","import { PACKET_TYPES } from \"./commons.js\";\nconst withNativeBlob = typeof Blob === \"function\" ||\n    (typeof Blob !== \"undefined\" &&\n        Object.prototype.toString.call(Blob) === \"[object BlobConstructor]\");\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\n// ArrayBuffer.isView method is not defined in IE10\nconst isView = obj => {\n    return typeof ArrayBuffer.isView === \"function\"\n        ? ArrayBuffer.isView(obj)\n        : obj && obj.buffer instanceof ArrayBuffer;\n};\nconst encodePacket = ({ type, data }, supportsBinary, callback) => {\n    if (withNativeBlob && data instanceof Blob) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(data, callback);\n        }\n    }\n    else if (withNativeArrayBuffer &&\n        (data instanceof ArrayBuffer || isView(data))) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(new Blob([data]), callback);\n        }\n    }\n    // plain string\n    return callback(PACKET_TYPES[type] + (data || \"\"));\n};\nconst encodeBlobAsBase64 = (data, callback) => {\n    const fileReader = new FileReader();\n    fileReader.onload = function () {\n        const content = fileReader.result.split(\",\")[1];\n        callback(\"b\" + content);\n    };\n    return fileReader.readAsDataURL(data);\n};\nexport default encodePacket;\n","/*\n * base64-arraybuffer 1.0.1 <https://github.com/niklasvh/base64-arraybuffer>\n * Copyright (c) 2021 Niklas von Hertzen <https://hertzen.com>\n * Released under MIT License\n */\nvar chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';\n// Use a lookup table to find the index.\nvar lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);\nfor (var i = 0; i < chars.length; i++) {\n    lookup[chars.charCodeAt(i)] = i;\n}\nvar encode = function (arraybuffer) {\n    var bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';\n    for (i = 0; i < len; i += 3) {\n        base64 += chars[bytes[i] >> 2];\n        base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];\n        base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];\n        base64 += chars[bytes[i + 2] & 63];\n    }\n    if (len % 3 === 2) {\n        base64 = base64.substring(0, base64.length - 1) + '=';\n    }\n    else if (len % 3 === 1) {\n        base64 = base64.substring(0, base64.length - 2) + '==';\n    }\n    return base64;\n};\nvar decode = function (base64) {\n    var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;\n    if (base64[base64.length - 1] === '=') {\n        bufferLength--;\n        if (base64[base64.length - 2] === '=') {\n            bufferLength--;\n        }\n    }\n    var arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);\n    for (i = 0; i < len; i += 4) {\n        encoded1 = lookup[base64.charCodeAt(i)];\n        encoded2 = lookup[base64.charCodeAt(i + 1)];\n        encoded3 = lookup[base64.charCodeAt(i + 2)];\n        encoded4 = lookup[base64.charCodeAt(i + 3)];\n        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);\n        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);\n        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);\n    }\n    return arraybuffer;\n};\n\nexport { decode, encode };\n//# sourceMappingURL=base64-arraybuffer.es5.js.map\n","import { ERROR_PACKET, PACKET_TYPES_REVERSE } from \"./commons.js\";\nimport { decode } from \"base64-arraybuffer\";\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\nconst decodePacket = (encodedPacket, binaryType) => {\n    if (typeof encodedPacket !== \"string\") {\n        return {\n            type: \"message\",\n            data: mapBinary(encodedPacket, binaryType)\n        };\n    }\n    const type = encodedPacket.charAt(0);\n    if (type === \"b\") {\n        return {\n            type: \"message\",\n            data: decodeBase64Packet(encodedPacket.substring(1), binaryType)\n        };\n    }\n    const packetType = PACKET_TYPES_REVERSE[type];\n    if (!packetType) {\n        return ERROR_PACKET;\n    }\n    return encodedPacket.length > 1\n        ? {\n            type: PACKET_TYPES_REVERSE[type],\n            data: encodedPacket.substring(1)\n        }\n        : {\n            type: PACKET_TYPES_REVERSE[type]\n        };\n};\nconst decodeBase64Packet = (data, binaryType) => {\n    if (withNativeArrayBuffer) {\n        const decoded = decode(data);\n        return mapBinary(decoded, binaryType);\n    }\n    else {\n        return { base64: true, data }; // fallback for old browsers\n    }\n};\nconst mapBinary = (data, binaryType) => {\n    switch (binaryType) {\n        case \"blob\":\n            return data instanceof ArrayBuffer ? new Blob([data]) : data;\n        case \"arraybuffer\":\n        default:\n            return data; // assuming the data is already an ArrayBuffer\n    }\n};\nexport default decodePacket;\n","import encodePacket from \"./encodePacket.js\";\nimport decodePacket from \"./decodePacket.js\";\nconst SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text\nconst encodePayload = (packets, callback) => {\n    // some packets may be added to the array while encoding, so the initial length must be saved\n    const length = packets.length;\n    const encodedPackets = new Array(length);\n    let count = 0;\n    packets.forEach((packet, i) => {\n        // force base64 encoding for binary packets\n        encodePacket(packet, false, encodedPacket => {\n            encodedPackets[i] = encodedPacket;\n            if (++count === length) {\n                callback(encodedPackets.join(SEPARATOR));\n            }\n        });\n    });\n};\nconst decodePayload = (encodedPayload, binaryType) => {\n    const encodedPackets = encodedPayload.split(SEPARATOR);\n    const packets = [];\n    for (let i = 0; i < encodedPackets.length; i++) {\n        const decodedPacket = decodePacket(encodedPackets[i], binaryType);\n        packets.push(decodedPacket);\n        if (decodedPacket.type === \"error\") {\n            break;\n        }\n    }\n    return packets;\n};\nexport const protocol = 4;\nexport { encodePacket, encodePayload, decodePacket, decodePayload };\n","import { decodePacket } from \"engine.io-parser\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { installTimerFunctions } from \"./util.js\";\nexport class Transport extends Emitter {\n    /**\n     * Transport abstract constructor.\n     *\n     * @param {Object} options.\n     * @api private\n     */\n    constructor(opts) {\n        super();\n        this.writable = false;\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.query = opts.query;\n        this.readyState = \"\";\n        this.socket = opts.socket;\n    }\n    /**\n     * Emits an error.\n     *\n     * @param {String} str\n     * @return {Transport} for chaining\n     * @api protected\n     */\n    onError(msg, desc) {\n        const err = new Error(msg);\n        // @ts-ignore\n        err.type = \"TransportError\";\n        // @ts-ignore\n        err.description = desc;\n        super.emit(\"error\", err);\n        return this;\n    }\n    /**\n     * Opens the transport.\n     *\n     * @api public\n     */\n    open() {\n        if (\"closed\" === this.readyState || \"\" === this.readyState) {\n            this.readyState = \"opening\";\n            this.doOpen();\n        }\n        return this;\n    }\n    /**\n     * Closes the transport.\n     *\n     * @api public\n     */\n    close() {\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.doClose();\n            this.onClose();\n        }\n        return this;\n    }\n    /**\n     * Sends multiple packets.\n     *\n     * @param {Array} packets\n     * @api public\n     */\n    send(packets) {\n        if (\"open\" === this.readyState) {\n            this.write(packets);\n        }\n        else {\n            // this might happen if the transport was silently closed in the beforeunload event handler\n        }\n    }\n    /**\n     * Called upon open\n     *\n     * @api protected\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        this.writable = true;\n        super.emit(\"open\");\n    }\n    /**\n     * Called with data.\n     *\n     * @param {String} data\n     * @api protected\n     */\n    onData(data) {\n        const packet = decodePacket(data, this.socket.binaryType);\n        this.onPacket(packet);\n    }\n    /**\n     * Called with a decoded packet.\n     *\n     * @api protected\n     */\n    onPacket(packet) {\n        super.emit(\"packet\", packet);\n    }\n    /**\n     * Called upon close.\n     *\n     * @api protected\n     */\n    onClose() {\n        this.readyState = \"closed\";\n        super.emit(\"close\");\n    }\n}\n","'use strict';\n\nvar alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')\n  , length = 64\n  , map = {}\n  , seed = 0\n  , i = 0\n  , prev;\n\n/**\n * Return a string representing the specified number.\n *\n * @param {Number} num The number to convert.\n * @returns {String} The string representation of the number.\n * @api public\n */\nfunction encode(num) {\n  var encoded = '';\n\n  do {\n    encoded = alphabet[num % length] + encoded;\n    num = Math.floor(num / length);\n  } while (num > 0);\n\n  return encoded;\n}\n\n/**\n * Return the integer value specified by the given string.\n *\n * @param {String} str The string to convert.\n * @returns {Number} The integer value represented by the string.\n * @api public\n */\nfunction decode(str) {\n  var decoded = 0;\n\n  for (i = 0; i < str.length; i++) {\n    decoded = decoded * length + map[str.charAt(i)];\n  }\n\n  return decoded;\n}\n\n/**\n * Yeast: A tiny growing id generator.\n *\n * @returns {String} A unique id.\n * @api public\n */\nfunction yeast() {\n  var now = encode(+new Date());\n\n  if (now !== prev) return seed = 0, prev = now;\n  return now +'.'+ encode(seed++);\n}\n\n//\n// Map each character to its index.\n//\nfor (; i < length; i++) map[alphabet[i]] = i;\n\n//\n// Expose the `yeast`, `encode` and `decode` functions.\n//\nyeast.encode = encode;\nyeast.decode = decode;\nmodule.exports = yeast;\n","/**\n * Compiles a querystring\n * Returns string representation of the object\n *\n * @param {Object}\n * @api private\n */\n\nexports.encode = function (obj) {\n  var str = '';\n\n  for (var i in obj) {\n    if (obj.hasOwnProperty(i)) {\n      if (str.length) str += '&';\n      str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);\n    }\n  }\n\n  return str;\n};\n\n/**\n * Parses a simple querystring into an object\n *\n * @param {String} qs\n * @api private\n */\n\nexports.decode = function(qs){\n  var qry = {};\n  var pairs = qs.split('&');\n  for (var i = 0, l = pairs.length; i < l; i++) {\n    var pair = pairs[i].split('=');\n    qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);\n  }\n  return qry;\n};\n","import { Transport } from \"../transport.js\";\nimport yeast from \"yeast\";\nimport parseqs from \"parseqs\";\nimport { encodePayload, decodePayload } from \"engine.io-parser\";\nexport class Polling extends Transport {\n    constructor() {\n        super(...arguments);\n        this.polling = false;\n    }\n    /**\n     * Transport name.\n     */\n    get name() {\n        return \"polling\";\n    }\n    /**\n     * Opens the socket (triggers polling). We write a PING message to determine\n     * when the transport is open.\n     *\n     * @api private\n     */\n    doOpen() {\n        this.poll();\n    }\n    /**\n     * Pauses polling.\n     *\n     * @param {Function} callback upon buffers are flushed and transport is paused\n     * @api private\n     */\n    pause(onPause) {\n        this.readyState = \"pausing\";\n        const pause = () => {\n            this.readyState = \"paused\";\n            onPause();\n        };\n        if (this.polling || !this.writable) {\n            let total = 0;\n            if (this.polling) {\n                total++;\n                this.once(\"pollComplete\", function () {\n                    --total || pause();\n                });\n            }\n            if (!this.writable) {\n                total++;\n                this.once(\"drain\", function () {\n                    --total || pause();\n                });\n            }\n        }\n        else {\n            pause();\n        }\n    }\n    /**\n     * Starts polling cycle.\n     *\n     * @api public\n     */\n    poll() {\n        this.polling = true;\n        this.doPoll();\n        this.emit(\"poll\");\n    }\n    /**\n     * Overloads onData to detect payloads.\n     *\n     * @api private\n     */\n    onData(data) {\n        const callback = packet => {\n            // if its the first message we consider the transport open\n            if (\"opening\" === this.readyState && packet.type === \"open\") {\n                this.onOpen();\n            }\n            // if its a close packet, we close the ongoing requests\n            if (\"close\" === packet.type) {\n                this.onClose();\n                return false;\n            }\n            // otherwise bypass onData and handle the message\n            this.onPacket(packet);\n        };\n        // decode payload\n        decodePayload(data, this.socket.binaryType).forEach(callback);\n        // if an event did not trigger closing\n        if (\"closed\" !== this.readyState) {\n            // if we got data we're not polling\n            this.polling = false;\n            this.emit(\"pollComplete\");\n            if (\"open\" === this.readyState) {\n                this.poll();\n            }\n            else {\n            }\n        }\n    }\n    /**\n     * For polling, send a close packet.\n     *\n     * @api private\n     */\n    doClose() {\n        const close = () => {\n            this.write([{ type: \"close\" }]);\n        };\n        if (\"open\" === this.readyState) {\n            close();\n        }\n        else {\n            // in case we're trying to close while\n            // handshaking is in progress (GH-164)\n            this.once(\"open\", close);\n        }\n    }\n    /**\n     * Writes a packets payload.\n     *\n     * @param {Array} data packets\n     * @param {Function} drain callback\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        encodePayload(packets, data => {\n            this.doWrite(data, () => {\n                this.writable = true;\n                this.emit(\"drain\");\n            });\n        });\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"https\" : \"http\";\n        let port = \"\";\n        // cache busting is forced\n        if (false !== this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        if (!this.supportsBinary && !query.sid) {\n            query.b64 = 1;\n        }\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"https\" === schema && Number(this.opts.port) !== 443) ||\n                (\"http\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        const encodedQuery = parseqs.encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n}\n","/* global attachEvent */\nimport XMLHttpRequest from \"./xmlhttprequest.js\";\nimport globalThis from \"../globalThis.js\";\nimport { installTimerFunctions, pick } from \"../util.js\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { Polling } from \"./polling.js\";\n/**\n * Empty function\n */\nfunction empty() { }\nconst hasXHR2 = (function () {\n    const xhr = new XMLHttpRequest({\n        xdomain: false\n    });\n    return null != xhr.responseType;\n})();\nexport class XHR extends Polling {\n    /**\n     * XHR Polling constructor.\n     *\n     * @param {Object} opts\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        if (typeof location !== \"undefined\") {\n            const isSSL = \"https:\" === location.protocol;\n            let port = location.port;\n            // some user agents have empty `location.port`\n            if (!port) {\n                port = isSSL ? \"443\" : \"80\";\n            }\n            this.xd =\n                (typeof location !== \"undefined\" &&\n                    opts.hostname !== location.hostname) ||\n                    port !== opts.port;\n            this.xs = opts.secure !== isSSL;\n        }\n        /**\n         * XHR supports binary\n         */\n        const forceBase64 = opts && opts.forceBase64;\n        this.supportsBinary = hasXHR2 && !forceBase64;\n    }\n    /**\n     * Creates a request.\n     *\n     * @param {String} method\n     * @api private\n     */\n    request(opts = {}) {\n        Object.assign(opts, { xd: this.xd, xs: this.xs }, this.opts);\n        return new Request(this.uri(), opts);\n    }\n    /**\n     * Sends data.\n     *\n     * @param {String} data to send.\n     * @param {Function} called upon flush.\n     * @api private\n     */\n    doWrite(data, fn) {\n        const req = this.request({\n            method: \"POST\",\n            data: data\n        });\n        req.on(\"success\", fn);\n        req.on(\"error\", err => {\n            this.onError(\"xhr post error\", err);\n        });\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n    doPoll() {\n        const req = this.request();\n        req.on(\"data\", this.onData.bind(this));\n        req.on(\"error\", err => {\n            this.onError(\"xhr poll error\", err);\n        });\n        this.pollXhr = req;\n    }\n}\nexport class Request extends Emitter {\n    /**\n     * Request constructor\n     *\n     * @param {Object} options\n     * @api public\n     */\n    constructor(uri, opts) {\n        super();\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.method = opts.method || \"GET\";\n        this.uri = uri;\n        this.async = false !== opts.async;\n        this.data = undefined !== opts.data ? opts.data : null;\n        this.create();\n    }\n    /**\n     * Creates the XHR object and sends the request.\n     *\n     * @api private\n     */\n    create() {\n        const opts = pick(this.opts, \"agent\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"autoUnref\");\n        opts.xdomain = !!this.opts.xd;\n        opts.xscheme = !!this.opts.xs;\n        const xhr = (this.xhr = new XMLHttpRequest(opts));\n        try {\n            xhr.open(this.method, this.uri, this.async);\n            try {\n                if (this.opts.extraHeaders) {\n                    xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n                    for (let i in this.opts.extraHeaders) {\n                        if (this.opts.extraHeaders.hasOwnProperty(i)) {\n                            xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n                        }\n                    }\n                }\n            }\n            catch (e) { }\n            if (\"POST\" === this.method) {\n                try {\n                    xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n                }\n                catch (e) { }\n            }\n            try {\n                xhr.setRequestHeader(\"Accept\", \"*/*\");\n            }\n            catch (e) { }\n            // ie6 check\n            if (\"withCredentials\" in xhr) {\n                xhr.withCredentials = this.opts.withCredentials;\n            }\n            if (this.opts.requestTimeout) {\n                xhr.timeout = this.opts.requestTimeout;\n            }\n            xhr.onreadystatechange = () => {\n                if (4 !== xhr.readyState)\n                    return;\n                if (200 === xhr.status || 1223 === xhr.status) {\n                    this.onLoad();\n                }\n                else {\n                    // make sure the `error` event handler that's user-set\n                    // does not throw in the same tick and gets caught here\n                    this.setTimeoutFn(() => {\n                        this.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n                    }, 0);\n                }\n            };\n            xhr.send(this.data);\n        }\n        catch (e) {\n            // Need to defer since .create() is called directly from the constructor\n            // and thus the 'error' event can only be only bound *after* this exception\n            // occurs.  Therefore, also, we cannot throw here at all.\n            this.setTimeoutFn(() => {\n                this.onError(e);\n            }, 0);\n            return;\n        }\n        if (typeof document !== \"undefined\") {\n            this.index = Request.requestsCount++;\n            Request.requests[this.index] = this;\n        }\n    }\n    /**\n     * Called upon successful response.\n     *\n     * @api private\n     */\n    onSuccess() {\n        this.emit(\"success\");\n        this.cleanup();\n    }\n    /**\n     * Called if we have data.\n     *\n     * @api private\n     */\n    onData(data) {\n        this.emit(\"data\", data);\n        this.onSuccess();\n    }\n    /**\n     * Called upon error.\n     *\n     * @api private\n     */\n    onError(err) {\n        this.emit(\"error\", err);\n        this.cleanup(true);\n    }\n    /**\n     * Cleans up house.\n     *\n     * @api private\n     */\n    cleanup(fromError) {\n        if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n            return;\n        }\n        this.xhr.onreadystatechange = empty;\n        if (fromError) {\n            try {\n                this.xhr.abort();\n            }\n            catch (e) { }\n        }\n        if (typeof document !== \"undefined\") {\n            delete Request.requests[this.index];\n        }\n        this.xhr = null;\n    }\n    /**\n     * Called upon load.\n     *\n     * @api private\n     */\n    onLoad() {\n        const data = this.xhr.responseText;\n        if (data !== null) {\n            this.onData(data);\n        }\n    }\n    /**\n     * Aborts the request.\n     *\n     * @api public\n     */\n    abort() {\n        this.cleanup();\n    }\n}\nRequest.requestsCount = 0;\nRequest.requests = {};\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\nif (typeof document !== \"undefined\") {\n    // @ts-ignore\n    if (typeof attachEvent === \"function\") {\n        // @ts-ignore\n        attachEvent(\"onunload\", unloadHandler);\n    }\n    else if (typeof addEventListener === \"function\") {\n        const terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n        addEventListener(terminationEvent, unloadHandler, false);\n    }\n}\nfunction unloadHandler() {\n    for (let i in Request.requests) {\n        if (Request.requests.hasOwnProperty(i)) {\n            Request.requests[i].abort();\n        }\n    }\n}\n","import globalThis from \"../globalThis.js\";\nexport const nextTick = (() => {\n    const isPromiseAvailable = typeof Promise === \"function\" && typeof Promise.resolve === \"function\";\n    if (isPromiseAvailable) {\n        return cb => Promise.resolve().then(cb);\n    }\n    else {\n        return (cb, setTimeoutFn) => setTimeoutFn(cb, 0);\n    }\n})();\nexport const WebSocket = globalThis.WebSocket || globalThis.MozWebSocket;\nexport const usingBrowserWebSocket = true;\nexport const defaultBinaryType = \"arraybuffer\";\n","import { Transport } from \"../transport.js\";\nimport parseqs from \"parseqs\";\nimport yeast from \"yeast\";\nimport { pick } from \"../util.js\";\nimport { defaultBinaryType, nextTick, usingBrowserWebSocket, WebSocket } from \"./websocket-constructor.js\";\nimport { encodePacket } from \"engine.io-parser\";\n// detect ReactNative environment\nconst isReactNative = typeof navigator !== \"undefined\" &&\n    typeof navigator.product === \"string\" &&\n    navigator.product.toLowerCase() === \"reactnative\";\nexport class WS extends Transport {\n    /**\n     * WebSocket transport constructor.\n     *\n     * @api {Object} connection options\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        this.supportsBinary = !opts.forceBase64;\n    }\n    /**\n     * Transport name.\n     *\n     * @api public\n     */\n    get name() {\n        return \"websocket\";\n    }\n    /**\n     * Opens socket.\n     *\n     * @api private\n     */\n    doOpen() {\n        if (!this.check()) {\n            // let probe timeout\n            return;\n        }\n        const uri = this.uri();\n        const protocols = this.opts.protocols;\n        // React Native only supports the 'headers' option, and will print a warning if anything else is passed\n        const opts = isReactNative\n            ? {}\n            : pick(this.opts, \"agent\", \"perMessageDeflate\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"localAddress\", \"protocolVersion\", \"origin\", \"maxPayload\", \"family\", \"checkServerIdentity\");\n        if (this.opts.extraHeaders) {\n            opts.headers = this.opts.extraHeaders;\n        }\n        try {\n            this.ws =\n                usingBrowserWebSocket && !isReactNative\n                    ? protocols\n                        ? new WebSocket(uri, protocols)\n                        : new WebSocket(uri)\n                    : new WebSocket(uri, protocols, opts);\n        }\n        catch (err) {\n            return this.emit(\"error\", err);\n        }\n        this.ws.binaryType = this.socket.binaryType || defaultBinaryType;\n        this.addEventListeners();\n    }\n    /**\n     * Adds event listeners to the socket\n     *\n     * @api private\n     */\n    addEventListeners() {\n        this.ws.onopen = () => {\n            if (this.opts.autoUnref) {\n                this.ws._socket.unref();\n            }\n            this.onOpen();\n        };\n        this.ws.onclose = this.onClose.bind(this);\n        this.ws.onmessage = ev => this.onData(ev.data);\n        this.ws.onerror = e => this.onError(\"websocket error\", e);\n    }\n    /**\n     * Writes data to socket.\n     *\n     * @param {Array} array of packets.\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        // encodePacket efficient as it uses WS framing\n        // no need for encodePayload\n        for (let i = 0; i < packets.length; i++) {\n            const packet = packets[i];\n            const lastPacket = i === packets.length - 1;\n            encodePacket(packet, this.supportsBinary, data => {\n                // always create a new object (GH-437)\n                const opts = {};\n                if (!usingBrowserWebSocket) {\n                    if (packet.options) {\n                        opts.compress = packet.options.compress;\n                    }\n                    if (this.opts.perMessageDeflate) {\n                        const len = \"string\" === typeof data ? Buffer.byteLength(data) : data.length;\n                        if (len < this.opts.perMessageDeflate.threshold) {\n                            opts.compress = false;\n                        }\n                    }\n                }\n                // Sometimes the websocket has already been closed but the browser didn't\n                // have a chance of informing us about it yet, in that case send will\n                // throw an error\n                try {\n                    if (usingBrowserWebSocket) {\n                        // TypeError is thrown when passing the second argument on Safari\n                        this.ws.send(data);\n                    }\n                    else {\n                        this.ws.send(data, opts);\n                    }\n                }\n                catch (e) {\n                }\n                if (lastPacket) {\n                    // fake drain\n                    // defer to next tick to allow Socket to clear writeBuffer\n                    nextTick(() => {\n                        this.writable = true;\n                        this.emit(\"drain\");\n                    }, this.setTimeoutFn);\n                }\n            });\n        }\n    }\n    /**\n     * Closes socket.\n     *\n     * @api private\n     */\n    doClose() {\n        if (typeof this.ws !== \"undefined\") {\n            this.ws.close();\n            this.ws = null;\n        }\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"wss\" : \"ws\";\n        let port = \"\";\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"wss\" === schema && Number(this.opts.port) !== 443) ||\n                (\"ws\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        // append timestamp to URI\n        if (this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        // communicate binary support capabilities\n        if (!this.supportsBinary) {\n            query.b64 = 1;\n        }\n        const encodedQuery = parseqs.encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n    /**\n     * Feature detection for WebSocket.\n     *\n     * @return {Boolean} whether this transport is available.\n     * @api public\n     */\n    check() {\n        return (!!WebSocket &&\n            !(\"__initialize\" in WebSocket && this.name === WS.prototype.name));\n    }\n}\n","import { XHR } from \"./polling-xhr.js\";\nimport { WS } from \"./websocket.js\";\nexport const transports = {\n    websocket: WS,\n    polling: XHR\n};\n","/**\n * Parses an URI\n *\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\n * @api private\n */\n\nvar re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\n\nvar parts = [\n    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'\n];\n\nmodule.exports = function parseuri(str) {\n    var src = str,\n        b = str.indexOf('['),\n        e = str.indexOf(']');\n\n    if (b != -1 && e != -1) {\n        str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n    }\n\n    var m = re.exec(str || ''),\n        uri = {},\n        i = 14;\n\n    while (i--) {\n        uri[parts[i]] = m[i] || '';\n    }\n\n    if (b != -1 && e != -1) {\n        uri.source = src;\n        uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n        uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n        uri.ipv6uri = true;\n    }\n\n    uri.pathNames = pathNames(uri, uri['path']);\n    uri.queryKey = queryKey(uri, uri['query']);\n\n    return uri;\n};\n\nfunction pathNames(obj, path) {\n    var regx = /\\/{2,9}/g,\n        names = path.replace(regx, \"/\").split(\"/\");\n\n    if (path.substr(0, 1) == '/' || path.length === 0) {\n        names.splice(0, 1);\n    }\n    if (path.substr(path.length - 1, 1) == '/') {\n        names.splice(names.length - 1, 1);\n    }\n\n    return names;\n}\n\nfunction queryKey(uri, query) {\n    var data = {};\n\n    query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {\n        if ($1) {\n            data[$1] = $2;\n        }\n    });\n\n    return data;\n}\n","import { transports } from \"./transports/index.js\";\nimport { installTimerFunctions } from \"./util.js\";\nimport parseqs from \"parseqs\";\nimport parseuri from \"parseuri\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { protocol } from \"engine.io-parser\";\nexport class Socket extends Emitter {\n    /**\n     * Socket constructor.\n     *\n     * @param {String|Object} uri or options\n     * @param {Object} opts - options\n     * @api public\n     */\n    constructor(uri, opts = {}) {\n        super();\n        if (uri && \"object\" === typeof uri) {\n            opts = uri;\n            uri = null;\n        }\n        if (uri) {\n            uri = parseuri(uri);\n            opts.hostname = uri.host;\n            opts.secure = uri.protocol === \"https\" || uri.protocol === \"wss\";\n            opts.port = uri.port;\n            if (uri.query)\n                opts.query = uri.query;\n        }\n        else if (opts.host) {\n            opts.hostname = parseuri(opts.host).host;\n        }\n        installTimerFunctions(this, opts);\n        this.secure =\n            null != opts.secure\n                ? opts.secure\n                : typeof location !== \"undefined\" && \"https:\" === location.protocol;\n        if (opts.hostname && !opts.port) {\n            // if no port is specified manually, use the protocol default\n            opts.port = this.secure ? \"443\" : \"80\";\n        }\n        this.hostname =\n            opts.hostname ||\n                (typeof location !== \"undefined\" ? location.hostname : \"localhost\");\n        this.port =\n            opts.port ||\n                (typeof location !== \"undefined\" && location.port\n                    ? location.port\n                    : this.secure\n                        ? \"443\"\n                        : \"80\");\n        this.transports = opts.transports || [\"polling\", \"websocket\"];\n        this.readyState = \"\";\n        this.writeBuffer = [];\n        this.prevBufferLen = 0;\n        this.opts = Object.assign({\n            path: \"/engine.io\",\n            agent: false,\n            withCredentials: false,\n            upgrade: true,\n            timestampParam: \"t\",\n            rememberUpgrade: false,\n            rejectUnauthorized: true,\n            perMessageDeflate: {\n                threshold: 1024\n            },\n            transportOptions: {},\n            closeOnBeforeunload: true\n        }, opts);\n        this.opts.path = this.opts.path.replace(/\\/$/, \"\") + \"/\";\n        if (typeof this.opts.query === \"string\") {\n            this.opts.query = parseqs.decode(this.opts.query);\n        }\n        // set on handshake\n        this.id = null;\n        this.upgrades = null;\n        this.pingInterval = null;\n        this.pingTimeout = null;\n        // set on heartbeat\n        this.pingTimeoutTimer = null;\n        if (typeof addEventListener === \"function\") {\n            if (this.opts.closeOnBeforeunload) {\n                // Firefox closes the connection when the \"beforeunload\" event is emitted but not Chrome. This event listener\n                // ensures every browser behaves the same (no \"disconnect\" event at the Socket.IO level when the page is\n                // closed/reloaded)\n                addEventListener(\"beforeunload\", () => {\n                    if (this.transport) {\n                        // silently close the transport\n                        this.transport.removeAllListeners();\n                        this.transport.close();\n                    }\n                }, false);\n            }\n            if (this.hostname !== \"localhost\") {\n                this.offlineEventListener = () => {\n                    this.onClose(\"transport close\");\n                };\n                addEventListener(\"offline\", this.offlineEventListener, false);\n            }\n        }\n        this.open();\n    }\n    /**\n     * Creates transport of the given type.\n     *\n     * @param {String} transport name\n     * @return {Transport}\n     * @api private\n     */\n    createTransport(name) {\n        const query = clone(this.opts.query);\n        // append engine.io protocol identifier\n        query.EIO = protocol;\n        // transport name\n        query.transport = name;\n        // session id if we already have one\n        if (this.id)\n            query.sid = this.id;\n        const opts = Object.assign({}, this.opts.transportOptions[name], this.opts, {\n            query,\n            socket: this,\n            hostname: this.hostname,\n            secure: this.secure,\n            port: this.port\n        });\n        return new transports[name](opts);\n    }\n    /**\n     * Initializes transport to use and starts probe.\n     *\n     * @api private\n     */\n    open() {\n        let transport;\n        if (this.opts.rememberUpgrade &&\n            Socket.priorWebsocketSuccess &&\n            this.transports.indexOf(\"websocket\") !== -1) {\n            transport = \"websocket\";\n        }\n        else if (0 === this.transports.length) {\n            // Emit error on next tick so it can be listened to\n            this.setTimeoutFn(() => {\n                this.emitReserved(\"error\", \"No transports available\");\n            }, 0);\n            return;\n        }\n        else {\n            transport = this.transports[0];\n        }\n        this.readyState = \"opening\";\n        // Retry with the next transport if the transport is disabled (jsonp: false)\n        try {\n            transport = this.createTransport(transport);\n        }\n        catch (e) {\n            this.transports.shift();\n            this.open();\n            return;\n        }\n        transport.open();\n        this.setTransport(transport);\n    }\n    /**\n     * Sets the current transport. Disables the existing one (if any).\n     *\n     * @api private\n     */\n    setTransport(transport) {\n        if (this.transport) {\n            this.transport.removeAllListeners();\n        }\n        // set up transport\n        this.transport = transport;\n        // set up transport listeners\n        transport\n            .on(\"drain\", this.onDrain.bind(this))\n            .on(\"packet\", this.onPacket.bind(this))\n            .on(\"error\", this.onError.bind(this))\n            .on(\"close\", () => {\n            this.onClose(\"transport close\");\n        });\n    }\n    /**\n     * Probes a transport.\n     *\n     * @param {String} transport name\n     * @api private\n     */\n    probe(name) {\n        let transport = this.createTransport(name);\n        let failed = false;\n        Socket.priorWebsocketSuccess = false;\n        const onTransportOpen = () => {\n            if (failed)\n                return;\n            transport.send([{ type: \"ping\", data: \"probe\" }]);\n            transport.once(\"packet\", msg => {\n                if (failed)\n                    return;\n                if (\"pong\" === msg.type && \"probe\" === msg.data) {\n                    this.upgrading = true;\n                    this.emitReserved(\"upgrading\", transport);\n                    if (!transport)\n                        return;\n                    Socket.priorWebsocketSuccess = \"websocket\" === transport.name;\n                    this.transport.pause(() => {\n                        if (failed)\n                            return;\n                        if (\"closed\" === this.readyState)\n                            return;\n                        cleanup();\n                        this.setTransport(transport);\n                        transport.send([{ type: \"upgrade\" }]);\n                        this.emitReserved(\"upgrade\", transport);\n                        transport = null;\n                        this.upgrading = false;\n                        this.flush();\n                    });\n                }\n                else {\n                    const err = new Error(\"probe error\");\n                    // @ts-ignore\n                    err.transport = transport.name;\n                    this.emitReserved(\"upgradeError\", err);\n                }\n            });\n        };\n        function freezeTransport() {\n            if (failed)\n                return;\n            // Any callback called by transport should be ignored since now\n            failed = true;\n            cleanup();\n            transport.close();\n            transport = null;\n        }\n        // Handle any error that happens while probing\n        const onerror = err => {\n            const error = new Error(\"probe error: \" + err);\n            // @ts-ignore\n            error.transport = transport.name;\n            freezeTransport();\n            this.emitReserved(\"upgradeError\", error);\n        };\n        function onTransportClose() {\n            onerror(\"transport closed\");\n        }\n        // When the socket is closed while we're probing\n        function onclose() {\n            onerror(\"socket closed\");\n        }\n        // When the socket is upgraded while we're probing\n        function onupgrade(to) {\n            if (transport && to.name !== transport.name) {\n                freezeTransport();\n            }\n        }\n        // Remove all listeners on the transport and on self\n        const cleanup = () => {\n            transport.removeListener(\"open\", onTransportOpen);\n            transport.removeListener(\"error\", onerror);\n            transport.removeListener(\"close\", onTransportClose);\n            this.off(\"close\", onclose);\n            this.off(\"upgrading\", onupgrade);\n        };\n        transport.once(\"open\", onTransportOpen);\n        transport.once(\"error\", onerror);\n        transport.once(\"close\", onTransportClose);\n        this.once(\"close\", onclose);\n        this.once(\"upgrading\", onupgrade);\n        transport.open();\n    }\n    /**\n     * Called when connection is deemed open.\n     *\n     * @api private\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        Socket.priorWebsocketSuccess = \"websocket\" === this.transport.name;\n        this.emitReserved(\"open\");\n        this.flush();\n        // we check for `readyState` in case an `open`\n        // listener already closed the socket\n        if (\"open\" === this.readyState &&\n            this.opts.upgrade &&\n            this.transport.pause) {\n            let i = 0;\n            const l = this.upgrades.length;\n            for (; i < l; i++) {\n                this.probe(this.upgrades[i]);\n            }\n        }\n    }\n    /**\n     * Handles a packet.\n     *\n     * @api private\n     */\n    onPacket(packet) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            this.emitReserved(\"packet\", packet);\n            // Socket is live - any packet counts\n            this.emitReserved(\"heartbeat\");\n            switch (packet.type) {\n                case \"open\":\n                    this.onHandshake(JSON.parse(packet.data));\n                    break;\n                case \"ping\":\n                    this.resetPingTimeout();\n                    this.sendPacket(\"pong\");\n                    this.emitReserved(\"ping\");\n                    this.emitReserved(\"pong\");\n                    break;\n                case \"error\":\n                    const err = new Error(\"server error\");\n                    // @ts-ignore\n                    err.code = packet.data;\n                    this.onError(err);\n                    break;\n                case \"message\":\n                    this.emitReserved(\"data\", packet.data);\n                    this.emitReserved(\"message\", packet.data);\n                    break;\n            }\n        }\n        else {\n        }\n    }\n    /**\n     * Called upon handshake completion.\n     *\n     * @param {Object} data - handshake obj\n     * @api private\n     */\n    onHandshake(data) {\n        this.emitReserved(\"handshake\", data);\n        this.id = data.sid;\n        this.transport.query.sid = data.sid;\n        this.upgrades = this.filterUpgrades(data.upgrades);\n        this.pingInterval = data.pingInterval;\n        this.pingTimeout = data.pingTimeout;\n        this.onOpen();\n        // In case open handler closes socket\n        if (\"closed\" === this.readyState)\n            return;\n        this.resetPingTimeout();\n    }\n    /**\n     * Sets and resets ping timeout timer based on server pings.\n     *\n     * @api private\n     */\n    resetPingTimeout() {\n        this.clearTimeoutFn(this.pingTimeoutTimer);\n        this.pingTimeoutTimer = this.setTimeoutFn(() => {\n            this.onClose(\"ping timeout\");\n        }, this.pingInterval + this.pingTimeout);\n        if (this.opts.autoUnref) {\n            this.pingTimeoutTimer.unref();\n        }\n    }\n    /**\n     * Called on `drain` event\n     *\n     * @api private\n     */\n    onDrain() {\n        this.writeBuffer.splice(0, this.prevBufferLen);\n        // setting prevBufferLen = 0 is very important\n        // for example, when upgrading, upgrade packet is sent over,\n        // and a nonzero prevBufferLen could cause problems on `drain`\n        this.prevBufferLen = 0;\n        if (0 === this.writeBuffer.length) {\n            this.emitReserved(\"drain\");\n        }\n        else {\n            this.flush();\n        }\n    }\n    /**\n     * Flush write buffers.\n     *\n     * @api private\n     */\n    flush() {\n        if (\"closed\" !== this.readyState &&\n            this.transport.writable &&\n            !this.upgrading &&\n            this.writeBuffer.length) {\n            this.transport.send(this.writeBuffer);\n            // keep track of current length of writeBuffer\n            // splice writeBuffer and callbackBuffer on `drain`\n            this.prevBufferLen = this.writeBuffer.length;\n            this.emitReserved(\"flush\");\n        }\n    }\n    /**\n     * Sends a message.\n     *\n     * @param {String} message.\n     * @param {Function} callback function.\n     * @param {Object} options.\n     * @return {Socket} for chaining.\n     * @api public\n     */\n    write(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    send(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    /**\n     * Sends a packet.\n     *\n     * @param {String} packet type.\n     * @param {String} data.\n     * @param {Object} options.\n     * @param {Function} callback function.\n     * @api private\n     */\n    sendPacket(type, data, options, fn) {\n        if (\"function\" === typeof data) {\n            fn = data;\n            data = undefined;\n        }\n        if (\"function\" === typeof options) {\n            fn = options;\n            options = null;\n        }\n        if (\"closing\" === this.readyState || \"closed\" === this.readyState) {\n            return;\n        }\n        options = options || {};\n        options.compress = false !== options.compress;\n        const packet = {\n            type: type,\n            data: data,\n            options: options\n        };\n        this.emitReserved(\"packetCreate\", packet);\n        this.writeBuffer.push(packet);\n        if (fn)\n            this.once(\"flush\", fn);\n        this.flush();\n    }\n    /**\n     * Closes the connection.\n     *\n     * @api public\n     */\n    close() {\n        const close = () => {\n            this.onClose(\"forced close\");\n            this.transport.close();\n        };\n        const cleanupAndClose = () => {\n            this.off(\"upgrade\", cleanupAndClose);\n            this.off(\"upgradeError\", cleanupAndClose);\n            close();\n        };\n        const waitForUpgrade = () => {\n            // wait for upgrade to finish since we can't send packets while pausing a transport\n            this.once(\"upgrade\", cleanupAndClose);\n            this.once(\"upgradeError\", cleanupAndClose);\n        };\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.readyState = \"closing\";\n            if (this.writeBuffer.length) {\n                this.once(\"drain\", () => {\n                    if (this.upgrading) {\n                        waitForUpgrade();\n                    }\n                    else {\n                        close();\n                    }\n                });\n            }\n            else if (this.upgrading) {\n                waitForUpgrade();\n            }\n            else {\n                close();\n            }\n        }\n        return this;\n    }\n    /**\n     * Called upon transport error\n     *\n     * @api private\n     */\n    onError(err) {\n        Socket.priorWebsocketSuccess = false;\n        this.emitReserved(\"error\", err);\n        this.onClose(\"transport error\", err);\n    }\n    /**\n     * Called upon transport close.\n     *\n     * @api private\n     */\n    onClose(reason, desc) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            // clear timers\n            this.clearTimeoutFn(this.pingTimeoutTimer);\n            // stop event from firing again for transport\n            this.transport.removeAllListeners(\"close\");\n            // ensure transport won't stay open\n            this.transport.close();\n            // ignore further transport communication\n            this.transport.removeAllListeners();\n            if (typeof removeEventListener === \"function\") {\n                removeEventListener(\"offline\", this.offlineEventListener, false);\n            }\n            // set ready state\n            this.readyState = \"closed\";\n            // clear session id\n            this.id = null;\n            // emit close event\n            this.emitReserved(\"close\", reason, desc);\n            // clean buffers after, so users can still\n            // grab the buffers on `close` event\n            this.writeBuffer = [];\n            this.prevBufferLen = 0;\n        }\n    }\n    /**\n     * Filters upgrades, returning only those matching client transports.\n     *\n     * @param {Array} server upgrades\n     * @api private\n     *\n     */\n    filterUpgrades(upgrades) {\n        const filteredUpgrades = [];\n        let i = 0;\n        const j = upgrades.length;\n        for (; i < j; i++) {\n            if (~this.transports.indexOf(upgrades[i]))\n                filteredUpgrades.push(upgrades[i]);\n        }\n        return filteredUpgrades;\n    }\n}\nSocket.protocol = protocol;\nfunction clone(obj) {\n    const o = {};\n    for (let i in obj) {\n        if (obj.hasOwnProperty(i)) {\n            o[i] = obj[i];\n        }\n    }\n    return o;\n}\n","import { Socket } from \"./socket.js\";\nexport default (uri, opts) => new Socket(uri, 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diff --git a/dist/engine.io.min.js b/dist/engine.io.min.js
index 141128b74..87abce1b5 100644
--- a/dist/engine.io.min.js
+++ b/dist/engine.io.min.js
@@ -1,6 +1,7 @@
 /*!
- * Engine.IO v5.1.2
+ * Engine.IO v6.1.1
  * (c) 2014-2021 Guillermo Rauch
  * Released under the MIT License.
  */
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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)}}));
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+++ b/dist/engine.io.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"engine.io.min.js","sources":["../node_modules/has-cors/index.js","../build/esm/globalThis.browser.js","../build/esm/transports/xmlhttprequest.browser.js","../build/esm/util.js","../node_modules/@socket.io/component-emitter/index.js","../node_modules/engine.io-parser/build/esm/commons.js","../node_modules/base64-arraybuffer/dist/base64-arraybuffer.es5.js","../node_modules/engine.io-parser/build/esm/encodePacket.browser.js","../node_modules/yeast/index.js","../node_modules/engine.io-parser/build/esm/decodePacket.browser.js","../node_modules/engine.io-parser/build/esm/index.js","../build/esm/transport.js","../node_modules/parseqs/index.js","../build/esm/transports/polling.js","../build/esm/transports/polling-xhr.js","../build/esm/transports/websocket-constructor.browser.js","../build/esm/transports/websocket.js","../build/esm/transports/index.js","../node_modules/parseuri/index.js","../build/esm/socket.js","../build/esm/browser-entrypoint.js"],"sourcesContent":["\n/**\n * Module exports.\n *\n * Logic borrowed from Modernizr:\n *\n *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js\n */\n\ntry {\n  module.exports = typeof XMLHttpRequest !== 'undefined' &&\n    'withCredentials' in new XMLHttpRequest();\n} catch (err) {\n  // if XMLHttp support is disabled in IE then it will throw\n  // when trying to create\n  module.exports = false;\n}\n","export default (() => {\n    if (typeof self !== \"undefined\") {\n        return self;\n    }\n    else if (typeof window !== \"undefined\") {\n        return window;\n    }\n    else {\n        return Function(\"return this\")();\n    }\n})();\n","// browser shim for xmlhttprequest module\nimport hasCORS from \"has-cors\";\nimport globalThis from \"../globalThis.js\";\nexport default function (opts) {\n    const xdomain = opts.xdomain;\n    // XMLHttpRequest can be disabled on IE\n    try {\n        if (\"undefined\" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {\n            return new XMLHttpRequest();\n        }\n    }\n    catch (e) { }\n    if (!xdomain) {\n        try {\n            return new globalThis[[\"Active\"].concat(\"Object\").join(\"X\")](\"Microsoft.XMLHTTP\");\n        }\n        catch (e) { }\n    }\n}\n","import globalThis from \"./globalThis.js\";\nexport function pick(obj, ...attr) {\n    return attr.reduce((acc, k) => {\n        if (obj.hasOwnProperty(k)) {\n            acc[k] = obj[k];\n        }\n        return acc;\n    }, {});\n}\n// Keep a reference to the real timeout functions so they can be used when overridden\nconst NATIVE_SET_TIMEOUT = setTimeout;\nconst NATIVE_CLEAR_TIMEOUT = clearTimeout;\nexport function installTimerFunctions(obj, opts) {\n    if (opts.useNativeTimers) {\n        obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);\n        obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);\n    }\n    else {\n        obj.setTimeoutFn = setTimeout.bind(globalThis);\n        obj.clearTimeoutFn = clearTimeout.bind(globalThis);\n    }\n}\n","\n/**\n * Expose `Emitter`.\n */\n\nexports.Emitter = Emitter;\n\n/**\n * Initialize a new `Emitter`.\n *\n * @api public\n */\n\nfunction Emitter(obj) {\n  if (obj) return mixin(obj);\n}\n\n/**\n * Mixin the emitter properties.\n *\n * @param {Object} obj\n * @return {Object}\n * @api private\n */\n\nfunction mixin(obj) {\n  for (var key in Emitter.prototype) {\n    obj[key] = Emitter.prototype[key];\n  }\n  return obj;\n}\n\n/**\n * Listen on the given `event` with `fn`.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.on =\nEmitter.prototype.addEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n  (this._callbacks['$' + event] = this._callbacks['$' + event] || [])\n    .push(fn);\n  return this;\n};\n\n/**\n * Adds an `event` listener that will be invoked a single\n * time then automatically removed.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.once = function(event, fn){\n  function on() {\n    this.off(event, on);\n    fn.apply(this, arguments);\n  }\n\n  on.fn = fn;\n  this.on(event, on);\n  return this;\n};\n\n/**\n * Remove the given callback for `event` or all\n * registered callbacks.\n *\n * @param {String} event\n * @param {Function} fn\n * @return {Emitter}\n * @api public\n */\n\nEmitter.prototype.off =\nEmitter.prototype.removeListener =\nEmitter.prototype.removeAllListeners =\nEmitter.prototype.removeEventListener = function(event, fn){\n  this._callbacks = this._callbacks || {};\n\n  // all\n  if (0 == arguments.length) {\n    this._callbacks = {};\n    return this;\n  }\n\n  // specific event\n  var callbacks = this._callbacks['$' + event];\n  if (!callbacks) return this;\n\n  // remove all handlers\n  if (1 == arguments.length) {\n    delete this._callbacks['$' + event];\n    return this;\n  }\n\n  // remove specific handler\n  var cb;\n  for (var i = 0; i < callbacks.length; i++) {\n    cb = callbacks[i];\n    if (cb === fn || cb.fn === fn) {\n      callbacks.splice(i, 1);\n      break;\n    }\n  }\n\n  // Remove event specific arrays for event types that no\n  // one is subscribed for to avoid memory leak.\n  if (callbacks.length === 0) {\n    delete this._callbacks['$' + event];\n  }\n\n  return this;\n};\n\n/**\n * Emit `event` with the given args.\n *\n * @param {String} event\n * @param {Mixed} ...\n * @return {Emitter}\n */\n\nEmitter.prototype.emit = function(event){\n  this._callbacks = this._callbacks || {};\n\n  var args = new Array(arguments.length - 1)\n    , callbacks = this._callbacks['$' + event];\n\n  for (var i = 1; i < arguments.length; i++) {\n    args[i - 1] = arguments[i];\n  }\n\n  if (callbacks) {\n    callbacks = callbacks.slice(0);\n    for (var i = 0, len = callbacks.length; i < len; ++i) {\n      callbacks[i].apply(this, args);\n    }\n  }\n\n  return this;\n};\n\n// alias used for reserved events (protected method)\nEmitter.prototype.emitReserved = Emitter.prototype.emit;\n\n/**\n * Return array of callbacks for `event`.\n *\n * @param {String} event\n * @return {Array}\n * @api public\n */\n\nEmitter.prototype.listeners = function(event){\n  this._callbacks = this._callbacks || {};\n  return this._callbacks['$' + event] || [];\n};\n\n/**\n * Check if this emitter has `event` handlers.\n *\n * @param {String} event\n * @return {Boolean}\n * @api public\n */\n\nEmitter.prototype.hasListeners = function(event){\n  return !! this.listeners(event).length;\n};\n","const PACKET_TYPES = Object.create(null); // no Map = no polyfill\nPACKET_TYPES[\"open\"] = \"0\";\nPACKET_TYPES[\"close\"] = \"1\";\nPACKET_TYPES[\"ping\"] = \"2\";\nPACKET_TYPES[\"pong\"] = \"3\";\nPACKET_TYPES[\"message\"] = \"4\";\nPACKET_TYPES[\"upgrade\"] = \"5\";\nPACKET_TYPES[\"noop\"] = \"6\";\nconst PACKET_TYPES_REVERSE = Object.create(null);\nObject.keys(PACKET_TYPES).forEach(key => {\n    PACKET_TYPES_REVERSE[PACKET_TYPES[key]] = key;\n});\nconst ERROR_PACKET = { type: \"error\", data: \"parser error\" };\nexport { PACKET_TYPES, PACKET_TYPES_REVERSE, ERROR_PACKET };\n","/*\n * base64-arraybuffer 1.0.1 <https://github.com/niklasvh/base64-arraybuffer>\n * Copyright (c) 2021 Niklas von Hertzen <https://hertzen.com>\n * Released under MIT License\n */\nvar chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';\n// Use a lookup table to find the index.\nvar lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);\nfor (var i = 0; i < chars.length; i++) {\n    lookup[chars.charCodeAt(i)] = i;\n}\nvar encode = function (arraybuffer) {\n    var bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';\n    for (i = 0; i < len; i += 3) {\n        base64 += chars[bytes[i] >> 2];\n        base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];\n        base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];\n        base64 += chars[bytes[i + 2] & 63];\n    }\n    if (len % 3 === 2) {\n        base64 = base64.substring(0, base64.length - 1) + '=';\n    }\n    else if (len % 3 === 1) {\n        base64 = base64.substring(0, base64.length - 2) + '==';\n    }\n    return base64;\n};\nvar decode = function (base64) {\n    var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;\n    if (base64[base64.length - 1] === '=') {\n        bufferLength--;\n        if (base64[base64.length - 2] === '=') {\n            bufferLength--;\n        }\n    }\n    var arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);\n    for (i = 0; i < len; i += 4) {\n        encoded1 = lookup[base64.charCodeAt(i)];\n        encoded2 = lookup[base64.charCodeAt(i + 1)];\n        encoded3 = lookup[base64.charCodeAt(i + 2)];\n        encoded4 = lookup[base64.charCodeAt(i + 3)];\n        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);\n        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);\n        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);\n    }\n    return arraybuffer;\n};\n\nexport { decode, encode };\n//# sourceMappingURL=base64-arraybuffer.es5.js.map\n","import { PACKET_TYPES } from \"./commons.js\";\nconst withNativeBlob = typeof Blob === \"function\" ||\n    (typeof Blob !== \"undefined\" &&\n        Object.prototype.toString.call(Blob) === \"[object BlobConstructor]\");\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\n// ArrayBuffer.isView method is not defined in IE10\nconst isView = obj => {\n    return typeof ArrayBuffer.isView === \"function\"\n        ? ArrayBuffer.isView(obj)\n        : obj && obj.buffer instanceof ArrayBuffer;\n};\nconst encodePacket = ({ type, data }, supportsBinary, callback) => {\n    if (withNativeBlob && data instanceof Blob) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(data, callback);\n        }\n    }\n    else if (withNativeArrayBuffer &&\n        (data instanceof ArrayBuffer || isView(data))) {\n        if (supportsBinary) {\n            return callback(data);\n        }\n        else {\n            return encodeBlobAsBase64(new Blob([data]), callback);\n        }\n    }\n    // plain string\n    return callback(PACKET_TYPES[type] + (data || \"\"));\n};\nconst encodeBlobAsBase64 = (data, callback) => {\n    const fileReader = new FileReader();\n    fileReader.onload = function () {\n        const content = fileReader.result.split(\",\")[1];\n        callback(\"b\" + content);\n    };\n    return fileReader.readAsDataURL(data);\n};\nexport default encodePacket;\n","'use strict';\n\nvar alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'.split('')\n  , length = 64\n  , map = {}\n  , seed = 0\n  , i = 0\n  , prev;\n\n/**\n * Return a string representing the specified number.\n *\n * @param {Number} num The number to convert.\n * @returns {String} The string representation of the number.\n * @api public\n */\nfunction encode(num) {\n  var encoded = '';\n\n  do {\n    encoded = alphabet[num % length] + encoded;\n    num = Math.floor(num / length);\n  } while (num > 0);\n\n  return encoded;\n}\n\n/**\n * Return the integer value specified by the given string.\n *\n * @param {String} str The string to convert.\n * @returns {Number} The integer value represented by the string.\n * @api public\n */\nfunction decode(str) {\n  var decoded = 0;\n\n  for (i = 0; i < str.length; i++) {\n    decoded = decoded * length + map[str.charAt(i)];\n  }\n\n  return decoded;\n}\n\n/**\n * Yeast: A tiny growing id generator.\n *\n * @returns {String} A unique id.\n * @api public\n */\nfunction yeast() {\n  var now = encode(+new Date());\n\n  if (now !== prev) return seed = 0, prev = now;\n  return now +'.'+ encode(seed++);\n}\n\n//\n// Map each character to its index.\n//\nfor (; i < length; i++) map[alphabet[i]] = i;\n\n//\n// Expose the `yeast`, `encode` and `decode` functions.\n//\nyeast.encode = encode;\nyeast.decode = decode;\nmodule.exports = yeast;\n","import { ERROR_PACKET, PACKET_TYPES_REVERSE } from \"./commons.js\";\nimport { decode } from \"base64-arraybuffer\";\nconst withNativeArrayBuffer = typeof ArrayBuffer === \"function\";\nconst decodePacket = (encodedPacket, binaryType) => {\n    if (typeof encodedPacket !== \"string\") {\n        return {\n            type: \"message\",\n            data: mapBinary(encodedPacket, binaryType)\n        };\n    }\n    const type = encodedPacket.charAt(0);\n    if (type === \"b\") {\n        return {\n            type: \"message\",\n            data: decodeBase64Packet(encodedPacket.substring(1), binaryType)\n        };\n    }\n    const packetType = PACKET_TYPES_REVERSE[type];\n    if (!packetType) {\n        return ERROR_PACKET;\n    }\n    return encodedPacket.length > 1\n        ? {\n            type: PACKET_TYPES_REVERSE[type],\n            data: encodedPacket.substring(1)\n        }\n        : {\n            type: PACKET_TYPES_REVERSE[type]\n        };\n};\nconst decodeBase64Packet = (data, binaryType) => {\n    if (withNativeArrayBuffer) {\n        const decoded = decode(data);\n        return mapBinary(decoded, binaryType);\n    }\n    else {\n        return { base64: true, data }; // fallback for old browsers\n    }\n};\nconst mapBinary = (data, binaryType) => {\n    switch (binaryType) {\n        case \"blob\":\n            return data instanceof ArrayBuffer ? new Blob([data]) : data;\n        case \"arraybuffer\":\n        default:\n            return data; // assuming the data is already an ArrayBuffer\n    }\n};\nexport default decodePacket;\n","import encodePacket from \"./encodePacket.js\";\nimport decodePacket from \"./decodePacket.js\";\nconst SEPARATOR = String.fromCharCode(30); // see https://en.wikipedia.org/wiki/Delimiter#ASCII_delimited_text\nconst encodePayload = (packets, callback) => {\n    // some packets may be added to the array while encoding, so the initial length must be saved\n    const length = packets.length;\n    const encodedPackets = new Array(length);\n    let count = 0;\n    packets.forEach((packet, i) => {\n        // force base64 encoding for binary packets\n        encodePacket(packet, false, encodedPacket => {\n            encodedPackets[i] = encodedPacket;\n            if (++count === length) {\n                callback(encodedPackets.join(SEPARATOR));\n            }\n        });\n    });\n};\nconst decodePayload = (encodedPayload, binaryType) => {\n    const encodedPackets = encodedPayload.split(SEPARATOR);\n    const packets = [];\n    for (let i = 0; i < encodedPackets.length; i++) {\n        const decodedPacket = decodePacket(encodedPackets[i], binaryType);\n        packets.push(decodedPacket);\n        if (decodedPacket.type === \"error\") {\n            break;\n        }\n    }\n    return packets;\n};\nexport const protocol = 4;\nexport { encodePacket, encodePayload, decodePacket, decodePayload };\n","import { decodePacket } from \"engine.io-parser\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { installTimerFunctions } from \"./util.js\";\nexport class Transport extends Emitter {\n    /**\n     * Transport abstract constructor.\n     *\n     * @param {Object} options.\n     * @api private\n     */\n    constructor(opts) {\n        super();\n        this.writable = false;\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.query = opts.query;\n        this.readyState = \"\";\n        this.socket = opts.socket;\n    }\n    /**\n     * Emits an error.\n     *\n     * @param {String} str\n     * @return {Transport} for chaining\n     * @api protected\n     */\n    onError(msg, desc) {\n        const err = new Error(msg);\n        // @ts-ignore\n        err.type = \"TransportError\";\n        // @ts-ignore\n        err.description = desc;\n        super.emit(\"error\", err);\n        return this;\n    }\n    /**\n     * Opens the transport.\n     *\n     * @api public\n     */\n    open() {\n        if (\"closed\" === this.readyState || \"\" === this.readyState) {\n            this.readyState = \"opening\";\n            this.doOpen();\n        }\n        return this;\n    }\n    /**\n     * Closes the transport.\n     *\n     * @api public\n     */\n    close() {\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.doClose();\n            this.onClose();\n        }\n        return this;\n    }\n    /**\n     * Sends multiple packets.\n     *\n     * @param {Array} packets\n     * @api public\n     */\n    send(packets) {\n        if (\"open\" === this.readyState) {\n            this.write(packets);\n        }\n        else {\n            // this might happen if the transport was silently closed in the beforeunload event handler\n        }\n    }\n    /**\n     * Called upon open\n     *\n     * @api protected\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        this.writable = true;\n        super.emit(\"open\");\n    }\n    /**\n     * Called with data.\n     *\n     * @param {String} data\n     * @api protected\n     */\n    onData(data) {\n        const packet = decodePacket(data, this.socket.binaryType);\n        this.onPacket(packet);\n    }\n    /**\n     * Called with a decoded packet.\n     *\n     * @api protected\n     */\n    onPacket(packet) {\n        super.emit(\"packet\", packet);\n    }\n    /**\n     * Called upon close.\n     *\n     * @api protected\n     */\n    onClose() {\n        this.readyState = \"closed\";\n        super.emit(\"close\");\n    }\n}\n","/**\n * Compiles a querystring\n * Returns string representation of the object\n *\n * @param {Object}\n * @api private\n */\n\nexports.encode = function (obj) {\n  var str = '';\n\n  for (var i in obj) {\n    if (obj.hasOwnProperty(i)) {\n      if (str.length) str += '&';\n      str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);\n    }\n  }\n\n  return str;\n};\n\n/**\n * Parses a simple querystring into an object\n *\n * @param {String} qs\n * @api private\n */\n\nexports.decode = function(qs){\n  var qry = {};\n  var pairs = qs.split('&');\n  for (var i = 0, l = pairs.length; i < l; i++) {\n    var pair = pairs[i].split('=');\n    qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);\n  }\n  return qry;\n};\n","import { Transport } from \"../transport.js\";\nimport yeast from \"yeast\";\nimport parseqs from \"parseqs\";\nimport { encodePayload, decodePayload } from \"engine.io-parser\";\nexport class Polling extends Transport {\n    constructor() {\n        super(...arguments);\n        this.polling = false;\n    }\n    /**\n     * Transport name.\n     */\n    get name() {\n        return \"polling\";\n    }\n    /**\n     * Opens the socket (triggers polling). We write a PING message to determine\n     * when the transport is open.\n     *\n     * @api private\n     */\n    doOpen() {\n        this.poll();\n    }\n    /**\n     * Pauses polling.\n     *\n     * @param {Function} callback upon buffers are flushed and transport is paused\n     * @api private\n     */\n    pause(onPause) {\n        this.readyState = \"pausing\";\n        const pause = () => {\n            this.readyState = \"paused\";\n            onPause();\n        };\n        if (this.polling || !this.writable) {\n            let total = 0;\n            if (this.polling) {\n                total++;\n                this.once(\"pollComplete\", function () {\n                    --total || pause();\n                });\n            }\n            if (!this.writable) {\n                total++;\n                this.once(\"drain\", function () {\n                    --total || pause();\n                });\n            }\n        }\n        else {\n            pause();\n        }\n    }\n    /**\n     * Starts polling cycle.\n     *\n     * @api public\n     */\n    poll() {\n        this.polling = true;\n        this.doPoll();\n        this.emit(\"poll\");\n    }\n    /**\n     * Overloads onData to detect payloads.\n     *\n     * @api private\n     */\n    onData(data) {\n        const callback = packet => {\n            // if its the first message we consider the transport open\n            if (\"opening\" === this.readyState && packet.type === \"open\") {\n                this.onOpen();\n            }\n            // if its a close packet, we close the ongoing requests\n            if (\"close\" === packet.type) {\n                this.onClose();\n                return false;\n            }\n            // otherwise bypass onData and handle the message\n            this.onPacket(packet);\n        };\n        // decode payload\n        decodePayload(data, this.socket.binaryType).forEach(callback);\n        // if an event did not trigger closing\n        if (\"closed\" !== this.readyState) {\n            // if we got data we're not polling\n            this.polling = false;\n            this.emit(\"pollComplete\");\n            if (\"open\" === this.readyState) {\n                this.poll();\n            }\n            else {\n            }\n        }\n    }\n    /**\n     * For polling, send a close packet.\n     *\n     * @api private\n     */\n    doClose() {\n        const close = () => {\n            this.write([{ type: \"close\" }]);\n        };\n        if (\"open\" === this.readyState) {\n            close();\n        }\n        else {\n            // in case we're trying to close while\n            // handshaking is in progress (GH-164)\n            this.once(\"open\", close);\n        }\n    }\n    /**\n     * Writes a packets payload.\n     *\n     * @param {Array} data packets\n     * @param {Function} drain callback\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        encodePayload(packets, data => {\n            this.doWrite(data, () => {\n                this.writable = true;\n                this.emit(\"drain\");\n            });\n        });\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"https\" : \"http\";\n        let port = \"\";\n        // cache busting is forced\n        if (false !== this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        if (!this.supportsBinary && !query.sid) {\n            query.b64 = 1;\n        }\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"https\" === schema && Number(this.opts.port) !== 443) ||\n                (\"http\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        const encodedQuery = parseqs.encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n}\n","/* global attachEvent */\nimport XMLHttpRequest from \"./xmlhttprequest.js\";\nimport globalThis from \"../globalThis.js\";\nimport { installTimerFunctions, pick } from \"../util.js\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { Polling } from \"./polling.js\";\n/**\n * Empty function\n */\nfunction empty() { }\nconst hasXHR2 = (function () {\n    const xhr = new XMLHttpRequest({\n        xdomain: false\n    });\n    return null != xhr.responseType;\n})();\nexport class XHR extends Polling {\n    /**\n     * XHR Polling constructor.\n     *\n     * @param {Object} opts\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        if (typeof location !== \"undefined\") {\n            const isSSL = \"https:\" === location.protocol;\n            let port = location.port;\n            // some user agents have empty `location.port`\n            if (!port) {\n                port = isSSL ? \"443\" : \"80\";\n            }\n            this.xd =\n                (typeof location !== \"undefined\" &&\n                    opts.hostname !== location.hostname) ||\n                    port !== opts.port;\n            this.xs = opts.secure !== isSSL;\n        }\n        /**\n         * XHR supports binary\n         */\n        const forceBase64 = opts && opts.forceBase64;\n        this.supportsBinary = hasXHR2 && !forceBase64;\n    }\n    /**\n     * Creates a request.\n     *\n     * @param {String} method\n     * @api private\n     */\n    request(opts = {}) {\n        Object.assign(opts, { xd: this.xd, xs: this.xs }, this.opts);\n        return new Request(this.uri(), opts);\n    }\n    /**\n     * Sends data.\n     *\n     * @param {String} data to send.\n     * @param {Function} called upon flush.\n     * @api private\n     */\n    doWrite(data, fn) {\n        const req = this.request({\n            method: \"POST\",\n            data: data\n        });\n        req.on(\"success\", fn);\n        req.on(\"error\", err => {\n            this.onError(\"xhr post error\", err);\n        });\n    }\n    /**\n     * Starts a poll cycle.\n     *\n     * @api private\n     */\n    doPoll() {\n        const req = this.request();\n        req.on(\"data\", this.onData.bind(this));\n        req.on(\"error\", err => {\n            this.onError(\"xhr poll error\", err);\n        });\n        this.pollXhr = req;\n    }\n}\nexport class Request extends Emitter {\n    /**\n     * Request constructor\n     *\n     * @param {Object} options\n     * @api public\n     */\n    constructor(uri, opts) {\n        super();\n        installTimerFunctions(this, opts);\n        this.opts = opts;\n        this.method = opts.method || \"GET\";\n        this.uri = uri;\n        this.async = false !== opts.async;\n        this.data = undefined !== opts.data ? opts.data : null;\n        this.create();\n    }\n    /**\n     * Creates the XHR object and sends the request.\n     *\n     * @api private\n     */\n    create() {\n        const opts = pick(this.opts, \"agent\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"autoUnref\");\n        opts.xdomain = !!this.opts.xd;\n        opts.xscheme = !!this.opts.xs;\n        const xhr = (this.xhr = new XMLHttpRequest(opts));\n        try {\n            xhr.open(this.method, this.uri, this.async);\n            try {\n                if (this.opts.extraHeaders) {\n                    xhr.setDisableHeaderCheck && xhr.setDisableHeaderCheck(true);\n                    for (let i in this.opts.extraHeaders) {\n                        if (this.opts.extraHeaders.hasOwnProperty(i)) {\n                            xhr.setRequestHeader(i, this.opts.extraHeaders[i]);\n                        }\n                    }\n                }\n            }\n            catch (e) { }\n            if (\"POST\" === this.method) {\n                try {\n                    xhr.setRequestHeader(\"Content-type\", \"text/plain;charset=UTF-8\");\n                }\n                catch (e) { }\n            }\n            try {\n                xhr.setRequestHeader(\"Accept\", \"*/*\");\n            }\n            catch (e) { }\n            // ie6 check\n            if (\"withCredentials\" in xhr) {\n                xhr.withCredentials = this.opts.withCredentials;\n            }\n            if (this.opts.requestTimeout) {\n                xhr.timeout = this.opts.requestTimeout;\n            }\n            xhr.onreadystatechange = () => {\n                if (4 !== xhr.readyState)\n                    return;\n                if (200 === xhr.status || 1223 === xhr.status) {\n                    this.onLoad();\n                }\n                else {\n                    // make sure the `error` event handler that's user-set\n                    // does not throw in the same tick and gets caught here\n                    this.setTimeoutFn(() => {\n                        this.onError(typeof xhr.status === \"number\" ? xhr.status : 0);\n                    }, 0);\n                }\n            };\n            xhr.send(this.data);\n        }\n        catch (e) {\n            // Need to defer since .create() is called directly from the constructor\n            // and thus the 'error' event can only be only bound *after* this exception\n            // occurs.  Therefore, also, we cannot throw here at all.\n            this.setTimeoutFn(() => {\n                this.onError(e);\n            }, 0);\n            return;\n        }\n        if (typeof document !== \"undefined\") {\n            this.index = Request.requestsCount++;\n            Request.requests[this.index] = this;\n        }\n    }\n    /**\n     * Called upon successful response.\n     *\n     * @api private\n     */\n    onSuccess() {\n        this.emit(\"success\");\n        this.cleanup();\n    }\n    /**\n     * Called if we have data.\n     *\n     * @api private\n     */\n    onData(data) {\n        this.emit(\"data\", data);\n        this.onSuccess();\n    }\n    /**\n     * Called upon error.\n     *\n     * @api private\n     */\n    onError(err) {\n        this.emit(\"error\", err);\n        this.cleanup(true);\n    }\n    /**\n     * Cleans up house.\n     *\n     * @api private\n     */\n    cleanup(fromError) {\n        if (\"undefined\" === typeof this.xhr || null === this.xhr) {\n            return;\n        }\n        this.xhr.onreadystatechange = empty;\n        if (fromError) {\n            try {\n                this.xhr.abort();\n            }\n            catch (e) { }\n        }\n        if (typeof document !== \"undefined\") {\n            delete Request.requests[this.index];\n        }\n        this.xhr = null;\n    }\n    /**\n     * Called upon load.\n     *\n     * @api private\n     */\n    onLoad() {\n        const data = this.xhr.responseText;\n        if (data !== null) {\n            this.onData(data);\n        }\n    }\n    /**\n     * Aborts the request.\n     *\n     * @api public\n     */\n    abort() {\n        this.cleanup();\n    }\n}\nRequest.requestsCount = 0;\nRequest.requests = {};\n/**\n * Aborts pending requests when unloading the window. This is needed to prevent\n * memory leaks (e.g. when using IE) and to ensure that no spurious error is\n * emitted.\n */\nif (typeof document !== \"undefined\") {\n    // @ts-ignore\n    if (typeof attachEvent === \"function\") {\n        // @ts-ignore\n        attachEvent(\"onunload\", unloadHandler);\n    }\n    else if (typeof addEventListener === \"function\") {\n        const terminationEvent = \"onpagehide\" in globalThis ? \"pagehide\" : \"unload\";\n        addEventListener(terminationEvent, unloadHandler, false);\n    }\n}\nfunction unloadHandler() {\n    for (let i in Request.requests) {\n        if (Request.requests.hasOwnProperty(i)) {\n            Request.requests[i].abort();\n        }\n    }\n}\n","import globalThis from \"../globalThis.js\";\nexport const nextTick = (() => {\n    const isPromiseAvailable = typeof Promise === \"function\" && typeof Promise.resolve === \"function\";\n    if (isPromiseAvailable) {\n        return cb => Promise.resolve().then(cb);\n    }\n    else {\n        return (cb, setTimeoutFn) => setTimeoutFn(cb, 0);\n    }\n})();\nexport const WebSocket = globalThis.WebSocket || globalThis.MozWebSocket;\nexport const usingBrowserWebSocket = true;\nexport const defaultBinaryType = \"arraybuffer\";\n","import { Transport } from \"../transport.js\";\nimport parseqs from \"parseqs\";\nimport yeast from \"yeast\";\nimport { pick } from \"../util.js\";\nimport { defaultBinaryType, nextTick, usingBrowserWebSocket, WebSocket } from \"./websocket-constructor.js\";\nimport { encodePacket } from \"engine.io-parser\";\n// detect ReactNative environment\nconst isReactNative = typeof navigator !== \"undefined\" &&\n    typeof navigator.product === \"string\" &&\n    navigator.product.toLowerCase() === \"reactnative\";\nexport class WS extends Transport {\n    /**\n     * WebSocket transport constructor.\n     *\n     * @api {Object} connection options\n     * @api public\n     */\n    constructor(opts) {\n        super(opts);\n        this.supportsBinary = !opts.forceBase64;\n    }\n    /**\n     * Transport name.\n     *\n     * @api public\n     */\n    get name() {\n        return \"websocket\";\n    }\n    /**\n     * Opens socket.\n     *\n     * @api private\n     */\n    doOpen() {\n        if (!this.check()) {\n            // let probe timeout\n            return;\n        }\n        const uri = this.uri();\n        const protocols = this.opts.protocols;\n        // React Native only supports the 'headers' option, and will print a warning if anything else is passed\n        const opts = isReactNative\n            ? {}\n            : pick(this.opts, \"agent\", \"perMessageDeflate\", \"pfx\", \"key\", \"passphrase\", \"cert\", \"ca\", \"ciphers\", \"rejectUnauthorized\", \"localAddress\", \"protocolVersion\", \"origin\", \"maxPayload\", \"family\", \"checkServerIdentity\");\n        if (this.opts.extraHeaders) {\n            opts.headers = this.opts.extraHeaders;\n        }\n        try {\n            this.ws =\n                usingBrowserWebSocket && !isReactNative\n                    ? protocols\n                        ? new WebSocket(uri, protocols)\n                        : new WebSocket(uri)\n                    : new WebSocket(uri, protocols, opts);\n        }\n        catch (err) {\n            return this.emit(\"error\", err);\n        }\n        this.ws.binaryType = this.socket.binaryType || defaultBinaryType;\n        this.addEventListeners();\n    }\n    /**\n     * Adds event listeners to the socket\n     *\n     * @api private\n     */\n    addEventListeners() {\n        this.ws.onopen = () => {\n            if (this.opts.autoUnref) {\n                this.ws._socket.unref();\n            }\n            this.onOpen();\n        };\n        this.ws.onclose = this.onClose.bind(this);\n        this.ws.onmessage = ev => this.onData(ev.data);\n        this.ws.onerror = e => this.onError(\"websocket error\", e);\n    }\n    /**\n     * Writes data to socket.\n     *\n     * @param {Array} array of packets.\n     * @api private\n     */\n    write(packets) {\n        this.writable = false;\n        // encodePacket efficient as it uses WS framing\n        // no need for encodePayload\n        for (let i = 0; i < packets.length; i++) {\n            const packet = packets[i];\n            const lastPacket = i === packets.length - 1;\n            encodePacket(packet, this.supportsBinary, data => {\n                // always create a new object (GH-437)\n                const opts = {};\n                if (!usingBrowserWebSocket) {\n                    if (packet.options) {\n                        opts.compress = packet.options.compress;\n                    }\n                    if (this.opts.perMessageDeflate) {\n                        const len = \"string\" === typeof data ? Buffer.byteLength(data) : data.length;\n                        if (len < this.opts.perMessageDeflate.threshold) {\n                            opts.compress = false;\n                        }\n                    }\n                }\n                // Sometimes the websocket has already been closed but the browser didn't\n                // have a chance of informing us about it yet, in that case send will\n                // throw an error\n                try {\n                    if (usingBrowserWebSocket) {\n                        // TypeError is thrown when passing the second argument on Safari\n                        this.ws.send(data);\n                    }\n                    else {\n                        this.ws.send(data, opts);\n                    }\n                }\n                catch (e) {\n                }\n                if (lastPacket) {\n                    // fake drain\n                    // defer to next tick to allow Socket to clear writeBuffer\n                    nextTick(() => {\n                        this.writable = true;\n                        this.emit(\"drain\");\n                    }, this.setTimeoutFn);\n                }\n            });\n        }\n    }\n    /**\n     * Closes socket.\n     *\n     * @api private\n     */\n    doClose() {\n        if (typeof this.ws !== \"undefined\") {\n            this.ws.close();\n            this.ws = null;\n        }\n    }\n    /**\n     * Generates uri for connection.\n     *\n     * @api private\n     */\n    uri() {\n        let query = this.query || {};\n        const schema = this.opts.secure ? \"wss\" : \"ws\";\n        let port = \"\";\n        // avoid port if default for schema\n        if (this.opts.port &&\n            ((\"wss\" === schema && Number(this.opts.port) !== 443) ||\n                (\"ws\" === schema && Number(this.opts.port) !== 80))) {\n            port = \":\" + this.opts.port;\n        }\n        // append timestamp to URI\n        if (this.opts.timestampRequests) {\n            query[this.opts.timestampParam] = yeast();\n        }\n        // communicate binary support capabilities\n        if (!this.supportsBinary) {\n            query.b64 = 1;\n        }\n        const encodedQuery = parseqs.encode(query);\n        const ipv6 = this.opts.hostname.indexOf(\":\") !== -1;\n        return (schema +\n            \"://\" +\n            (ipv6 ? \"[\" + this.opts.hostname + \"]\" : this.opts.hostname) +\n            port +\n            this.opts.path +\n            (encodedQuery.length ? \"?\" + encodedQuery : \"\"));\n    }\n    /**\n     * Feature detection for WebSocket.\n     *\n     * @return {Boolean} whether this transport is available.\n     * @api public\n     */\n    check() {\n        return (!!WebSocket &&\n            !(\"__initialize\" in WebSocket && this.name === WS.prototype.name));\n    }\n}\n","import { XHR } from \"./polling-xhr.js\";\nimport { WS } from \"./websocket.js\";\nexport const transports = {\n    websocket: WS,\n    polling: XHR\n};\n","/**\n * Parses an URI\n *\n * @author Steven Levithan <stevenlevithan.com> (MIT license)\n * @api private\n */\n\nvar re = /^(?:(?![^:@]+:[^:@\\/]*@)(http|https|ws|wss):\\/\\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\\/?#]*)(?::(\\d*))?)(((\\/(?:[^?#](?![^?#\\/]*\\.[^?#\\/.]+(?:[?#]|$)))*\\/?)?([^?#\\/]*))(?:\\?([^#]*))?(?:#(.*))?)/;\n\nvar parts = [\n    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'\n];\n\nmodule.exports = function parseuri(str) {\n    var src = str,\n        b = str.indexOf('['),\n        e = str.indexOf(']');\n\n    if (b != -1 && e != -1) {\n        str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);\n    }\n\n    var m = re.exec(str || ''),\n        uri = {},\n        i = 14;\n\n    while (i--) {\n        uri[parts[i]] = m[i] || '';\n    }\n\n    if (b != -1 && e != -1) {\n        uri.source = src;\n        uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');\n        uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');\n        uri.ipv6uri = true;\n    }\n\n    uri.pathNames = pathNames(uri, uri['path']);\n    uri.queryKey = queryKey(uri, uri['query']);\n\n    return uri;\n};\n\nfunction pathNames(obj, path) {\n    var regx = /\\/{2,9}/g,\n        names = path.replace(regx, \"/\").split(\"/\");\n\n    if (path.substr(0, 1) == '/' || path.length === 0) {\n        names.splice(0, 1);\n    }\n    if (path.substr(path.length - 1, 1) == '/') {\n        names.splice(names.length - 1, 1);\n    }\n\n    return names;\n}\n\nfunction queryKey(uri, query) {\n    var data = {};\n\n    query.replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {\n        if ($1) {\n            data[$1] = $2;\n        }\n    });\n\n    return data;\n}\n","import { transports } from \"./transports/index.js\";\nimport { installTimerFunctions } from \"./util.js\";\nimport parseqs from \"parseqs\";\nimport parseuri from \"parseuri\";\nimport { Emitter } from \"@socket.io/component-emitter\";\nimport { protocol } from \"engine.io-parser\";\nexport class Socket extends Emitter {\n    /**\n     * Socket constructor.\n     *\n     * @param {String|Object} uri or options\n     * @param {Object} opts - options\n     * @api public\n     */\n    constructor(uri, opts = {}) {\n        super();\n        if (uri && \"object\" === typeof uri) {\n            opts = uri;\n            uri = null;\n        }\n        if (uri) {\n            uri = parseuri(uri);\n            opts.hostname = uri.host;\n            opts.secure = uri.protocol === \"https\" || uri.protocol === \"wss\";\n            opts.port = uri.port;\n            if (uri.query)\n                opts.query = uri.query;\n        }\n        else if (opts.host) {\n            opts.hostname = parseuri(opts.host).host;\n        }\n        installTimerFunctions(this, opts);\n        this.secure =\n            null != opts.secure\n                ? opts.secure\n                : typeof location !== \"undefined\" && \"https:\" === location.protocol;\n        if (opts.hostname && !opts.port) {\n            // if no port is specified manually, use the protocol default\n            opts.port = this.secure ? \"443\" : \"80\";\n        }\n        this.hostname =\n            opts.hostname ||\n                (typeof location !== \"undefined\" ? location.hostname : \"localhost\");\n        this.port =\n            opts.port ||\n                (typeof location !== \"undefined\" && location.port\n                    ? location.port\n                    : this.secure\n                        ? \"443\"\n                        : \"80\");\n        this.transports = opts.transports || [\"polling\", \"websocket\"];\n        this.readyState = \"\";\n        this.writeBuffer = [];\n        this.prevBufferLen = 0;\n        this.opts = Object.assign({\n            path: \"/engine.io\",\n            agent: false,\n            withCredentials: false,\n            upgrade: true,\n            timestampParam: \"t\",\n            rememberUpgrade: false,\n            rejectUnauthorized: true,\n            perMessageDeflate: {\n                threshold: 1024\n            },\n            transportOptions: {},\n            closeOnBeforeunload: true\n        }, opts);\n        this.opts.path = this.opts.path.replace(/\\/$/, \"\") + \"/\";\n        if (typeof this.opts.query === \"string\") {\n            this.opts.query = parseqs.decode(this.opts.query);\n        }\n        // set on handshake\n        this.id = null;\n        this.upgrades = null;\n        this.pingInterval = null;\n        this.pingTimeout = null;\n        // set on heartbeat\n        this.pingTimeoutTimer = null;\n        if (typeof addEventListener === \"function\") {\n            if (this.opts.closeOnBeforeunload) {\n                // Firefox closes the connection when the \"beforeunload\" event is emitted but not Chrome. This event listener\n                // ensures every browser behaves the same (no \"disconnect\" event at the Socket.IO level when the page is\n                // closed/reloaded)\n                addEventListener(\"beforeunload\", () => {\n                    if (this.transport) {\n                        // silently close the transport\n                        this.transport.removeAllListeners();\n                        this.transport.close();\n                    }\n                }, false);\n            }\n            if (this.hostname !== \"localhost\") {\n                this.offlineEventListener = () => {\n                    this.onClose(\"transport close\");\n                };\n                addEventListener(\"offline\", this.offlineEventListener, false);\n            }\n        }\n        this.open();\n    }\n    /**\n     * Creates transport of the given type.\n     *\n     * @param {String} transport name\n     * @return {Transport}\n     * @api private\n     */\n    createTransport(name) {\n        const query = clone(this.opts.query);\n        // append engine.io protocol identifier\n        query.EIO = protocol;\n        // transport name\n        query.transport = name;\n        // session id if we already have one\n        if (this.id)\n            query.sid = this.id;\n        const opts = Object.assign({}, this.opts.transportOptions[name], this.opts, {\n            query,\n            socket: this,\n            hostname: this.hostname,\n            secure: this.secure,\n            port: this.port\n        });\n        return new transports[name](opts);\n    }\n    /**\n     * Initializes transport to use and starts probe.\n     *\n     * @api private\n     */\n    open() {\n        let transport;\n        if (this.opts.rememberUpgrade &&\n            Socket.priorWebsocketSuccess &&\n            this.transports.indexOf(\"websocket\") !== -1) {\n            transport = \"websocket\";\n        }\n        else if (0 === this.transports.length) {\n            // Emit error on next tick so it can be listened to\n            this.setTimeoutFn(() => {\n                this.emitReserved(\"error\", \"No transports available\");\n            }, 0);\n            return;\n        }\n        else {\n            transport = this.transports[0];\n        }\n        this.readyState = \"opening\";\n        // Retry with the next transport if the transport is disabled (jsonp: false)\n        try {\n            transport = this.createTransport(transport);\n        }\n        catch (e) {\n            this.transports.shift();\n            this.open();\n            return;\n        }\n        transport.open();\n        this.setTransport(transport);\n    }\n    /**\n     * Sets the current transport. Disables the existing one (if any).\n     *\n     * @api private\n     */\n    setTransport(transport) {\n        if (this.transport) {\n            this.transport.removeAllListeners();\n        }\n        // set up transport\n        this.transport = transport;\n        // set up transport listeners\n        transport\n            .on(\"drain\", this.onDrain.bind(this))\n            .on(\"packet\", this.onPacket.bind(this))\n            .on(\"error\", this.onError.bind(this))\n            .on(\"close\", () => {\n            this.onClose(\"transport close\");\n        });\n    }\n    /**\n     * Probes a transport.\n     *\n     * @param {String} transport name\n     * @api private\n     */\n    probe(name) {\n        let transport = this.createTransport(name);\n        let failed = false;\n        Socket.priorWebsocketSuccess = false;\n        const onTransportOpen = () => {\n            if (failed)\n                return;\n            transport.send([{ type: \"ping\", data: \"probe\" }]);\n            transport.once(\"packet\", msg => {\n                if (failed)\n                    return;\n                if (\"pong\" === msg.type && \"probe\" === msg.data) {\n                    this.upgrading = true;\n                    this.emitReserved(\"upgrading\", transport);\n                    if (!transport)\n                        return;\n                    Socket.priorWebsocketSuccess = \"websocket\" === transport.name;\n                    this.transport.pause(() => {\n                        if (failed)\n                            return;\n                        if (\"closed\" === this.readyState)\n                            return;\n                        cleanup();\n                        this.setTransport(transport);\n                        transport.send([{ type: \"upgrade\" }]);\n                        this.emitReserved(\"upgrade\", transport);\n                        transport = null;\n                        this.upgrading = false;\n                        this.flush();\n                    });\n                }\n                else {\n                    const err = new Error(\"probe error\");\n                    // @ts-ignore\n                    err.transport = transport.name;\n                    this.emitReserved(\"upgradeError\", err);\n                }\n            });\n        };\n        function freezeTransport() {\n            if (failed)\n                return;\n            // Any callback called by transport should be ignored since now\n            failed = true;\n            cleanup();\n            transport.close();\n            transport = null;\n        }\n        // Handle any error that happens while probing\n        const onerror = err => {\n            const error = new Error(\"probe error: \" + err);\n            // @ts-ignore\n            error.transport = transport.name;\n            freezeTransport();\n            this.emitReserved(\"upgradeError\", error);\n        };\n        function onTransportClose() {\n            onerror(\"transport closed\");\n        }\n        // When the socket is closed while we're probing\n        function onclose() {\n            onerror(\"socket closed\");\n        }\n        // When the socket is upgraded while we're probing\n        function onupgrade(to) {\n            if (transport && to.name !== transport.name) {\n                freezeTransport();\n            }\n        }\n        // Remove all listeners on the transport and on self\n        const cleanup = () => {\n            transport.removeListener(\"open\", onTransportOpen);\n            transport.removeListener(\"error\", onerror);\n            transport.removeListener(\"close\", onTransportClose);\n            this.off(\"close\", onclose);\n            this.off(\"upgrading\", onupgrade);\n        };\n        transport.once(\"open\", onTransportOpen);\n        transport.once(\"error\", onerror);\n        transport.once(\"close\", onTransportClose);\n        this.once(\"close\", onclose);\n        this.once(\"upgrading\", onupgrade);\n        transport.open();\n    }\n    /**\n     * Called when connection is deemed open.\n     *\n     * @api private\n     */\n    onOpen() {\n        this.readyState = \"open\";\n        Socket.priorWebsocketSuccess = \"websocket\" === this.transport.name;\n        this.emitReserved(\"open\");\n        this.flush();\n        // we check for `readyState` in case an `open`\n        // listener already closed the socket\n        if (\"open\" === this.readyState &&\n            this.opts.upgrade &&\n            this.transport.pause) {\n            let i = 0;\n            const l = this.upgrades.length;\n            for (; i < l; i++) {\n                this.probe(this.upgrades[i]);\n            }\n        }\n    }\n    /**\n     * Handles a packet.\n     *\n     * @api private\n     */\n    onPacket(packet) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            this.emitReserved(\"packet\", packet);\n            // Socket is live - any packet counts\n            this.emitReserved(\"heartbeat\");\n            switch (packet.type) {\n                case \"open\":\n                    this.onHandshake(JSON.parse(packet.data));\n                    break;\n                case \"ping\":\n                    this.resetPingTimeout();\n                    this.sendPacket(\"pong\");\n                    this.emitReserved(\"ping\");\n                    this.emitReserved(\"pong\");\n                    break;\n                case \"error\":\n                    const err = new Error(\"server error\");\n                    // @ts-ignore\n                    err.code = packet.data;\n                    this.onError(err);\n                    break;\n                case \"message\":\n                    this.emitReserved(\"data\", packet.data);\n                    this.emitReserved(\"message\", packet.data);\n                    break;\n            }\n        }\n        else {\n        }\n    }\n    /**\n     * Called upon handshake completion.\n     *\n     * @param {Object} data - handshake obj\n     * @api private\n     */\n    onHandshake(data) {\n        this.emitReserved(\"handshake\", data);\n        this.id = data.sid;\n        this.transport.query.sid = data.sid;\n        this.upgrades = this.filterUpgrades(data.upgrades);\n        this.pingInterval = data.pingInterval;\n        this.pingTimeout = data.pingTimeout;\n        this.onOpen();\n        // In case open handler closes socket\n        if (\"closed\" === this.readyState)\n            return;\n        this.resetPingTimeout();\n    }\n    /**\n     * Sets and resets ping timeout timer based on server pings.\n     *\n     * @api private\n     */\n    resetPingTimeout() {\n        this.clearTimeoutFn(this.pingTimeoutTimer);\n        this.pingTimeoutTimer = this.setTimeoutFn(() => {\n            this.onClose(\"ping timeout\");\n        }, this.pingInterval + this.pingTimeout);\n        if (this.opts.autoUnref) {\n            this.pingTimeoutTimer.unref();\n        }\n    }\n    /**\n     * Called on `drain` event\n     *\n     * @api private\n     */\n    onDrain() {\n        this.writeBuffer.splice(0, this.prevBufferLen);\n        // setting prevBufferLen = 0 is very important\n        // for example, when upgrading, upgrade packet is sent over,\n        // and a nonzero prevBufferLen could cause problems on `drain`\n        this.prevBufferLen = 0;\n        if (0 === this.writeBuffer.length) {\n            this.emitReserved(\"drain\");\n        }\n        else {\n            this.flush();\n        }\n    }\n    /**\n     * Flush write buffers.\n     *\n     * @api private\n     */\n    flush() {\n        if (\"closed\" !== this.readyState &&\n            this.transport.writable &&\n            !this.upgrading &&\n            this.writeBuffer.length) {\n            this.transport.send(this.writeBuffer);\n            // keep track of current length of writeBuffer\n            // splice writeBuffer and callbackBuffer on `drain`\n            this.prevBufferLen = this.writeBuffer.length;\n            this.emitReserved(\"flush\");\n        }\n    }\n    /**\n     * Sends a message.\n     *\n     * @param {String} message.\n     * @param {Function} callback function.\n     * @param {Object} options.\n     * @return {Socket} for chaining.\n     * @api public\n     */\n    write(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    send(msg, options, fn) {\n        this.sendPacket(\"message\", msg, options, fn);\n        return this;\n    }\n    /**\n     * Sends a packet.\n     *\n     * @param {String} packet type.\n     * @param {String} data.\n     * @param {Object} options.\n     * @param {Function} callback function.\n     * @api private\n     */\n    sendPacket(type, data, options, fn) {\n        if (\"function\" === typeof data) {\n            fn = data;\n            data = undefined;\n        }\n        if (\"function\" === typeof options) {\n            fn = options;\n            options = null;\n        }\n        if (\"closing\" === this.readyState || \"closed\" === this.readyState) {\n            return;\n        }\n        options = options || {};\n        options.compress = false !== options.compress;\n        const packet = {\n            type: type,\n            data: data,\n            options: options\n        };\n        this.emitReserved(\"packetCreate\", packet);\n        this.writeBuffer.push(packet);\n        if (fn)\n            this.once(\"flush\", fn);\n        this.flush();\n    }\n    /**\n     * Closes the connection.\n     *\n     * @api public\n     */\n    close() {\n        const close = () => {\n            this.onClose(\"forced close\");\n            this.transport.close();\n        };\n        const cleanupAndClose = () => {\n            this.off(\"upgrade\", cleanupAndClose);\n            this.off(\"upgradeError\", cleanupAndClose);\n            close();\n        };\n        const waitForUpgrade = () => {\n            // wait for upgrade to finish since we can't send packets while pausing a transport\n            this.once(\"upgrade\", cleanupAndClose);\n            this.once(\"upgradeError\", cleanupAndClose);\n        };\n        if (\"opening\" === this.readyState || \"open\" === this.readyState) {\n            this.readyState = \"closing\";\n            if (this.writeBuffer.length) {\n                this.once(\"drain\", () => {\n                    if (this.upgrading) {\n                        waitForUpgrade();\n                    }\n                    else {\n                        close();\n                    }\n                });\n            }\n            else if (this.upgrading) {\n                waitForUpgrade();\n            }\n            else {\n                close();\n            }\n        }\n        return this;\n    }\n    /**\n     * Called upon transport error\n     *\n     * @api private\n     */\n    onError(err) {\n        Socket.priorWebsocketSuccess = false;\n        this.emitReserved(\"error\", err);\n        this.onClose(\"transport error\", err);\n    }\n    /**\n     * Called upon transport close.\n     *\n     * @api private\n     */\n    onClose(reason, desc) {\n        if (\"opening\" === this.readyState ||\n            \"open\" === this.readyState ||\n            \"closing\" === this.readyState) {\n            // clear timers\n            this.clearTimeoutFn(this.pingTimeoutTimer);\n            // stop event from firing again for transport\n            this.transport.removeAllListeners(\"close\");\n            // ensure transport won't stay open\n            this.transport.close();\n            // ignore further transport communication\n            this.transport.removeAllListeners();\n            if (typeof removeEventListener === \"function\") {\n      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\ No newline at end of file
diff --git a/lib/browser-entrypoint.ts b/lib/browser-entrypoint.ts
new file mode 100644
index 000000000..e478377c3
--- /dev/null
+++ b/lib/browser-entrypoint.ts
@@ -0,0 +1,3 @@
+import { Socket } from "./socket.js";
+
+export default (uri, opts) => new Socket(uri, opts);
diff --git a/lib/globalThis.browser.js b/lib/globalThis.browser.ts
similarity index 87%
rename from lib/globalThis.browser.js
rename to lib/globalThis.browser.ts
index e08544075..ea8c4c431 100644
--- a/lib/globalThis.browser.js
+++ b/lib/globalThis.browser.ts
@@ -1,4 +1,4 @@
-module.exports = (() => {
+export default (() => {
   if (typeof self !== "undefined") {
     return self;
   } else if (typeof window !== "undefined") {
diff --git a/lib/globalThis.js b/lib/globalThis.js
deleted file mode 100644
index e1465f205..000000000
--- a/lib/globalThis.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = global;
diff --git a/lib/globalThis.ts b/lib/globalThis.ts
new file mode 100644
index 000000000..1b8c4b29a
--- /dev/null
+++ b/lib/globalThis.ts
@@ -0,0 +1 @@
+export default global;
diff --git a/lib/index.js b/lib/index.js
deleted file mode 100644
index cce75cbfb..000000000
--- a/lib/index.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const Socket = require("./socket");
-
-module.exports = (uri, opts) => new Socket(uri, opts);
-
-/**
- * Expose deps for legacy compatibility
- * and standalone browser access.
- */
-
-module.exports.Socket = Socket;
-module.exports.protocol = Socket.protocol; // this is an int
-module.exports.Transport = require("./transport");
-module.exports.transports = require("./transports/index");
-module.exports.parser = require("engine.io-parser");
diff --git a/lib/index.ts b/lib/index.ts
new file mode 100644
index 000000000..625ebfd53
--- /dev/null
+++ b/lib/index.ts
@@ -0,0 +1,8 @@
+import { Socket } from "./socket.js";
+
+export { Socket };
+export { SocketOptions } from "./socket.js";
+export const protocol = Socket.protocol;
+export { Transport } from "./transport.js";
+export { transports } from "./transports/index.js";
+export { installTimerFunctions } from "./util.js";
diff --git a/lib/socket.js b/lib/socket.ts
similarity index 57%
rename from lib/socket.js
rename to lib/socket.ts
index 0f04c198a..41c5a5e07 100644
--- a/lib/socket.js
+++ b/lib/socket.ts
@@ -1,20 +1,273 @@
-const transports = require("./transports/index");
-const Emitter = require("component-emitter");
-const debug = require("debug")("engine.io-client:socket");
-const parser = require("engine.io-parser");
-const parseuri = require("parseuri");
-const parseqs = require("parseqs");
-const { installTimerFunctions } = require("./util");
+import { transports } from "./transports/index.js";
+import { installTimerFunctions, byteLength } from "./util.js";
+import parseqs from "parseqs";
+import parseuri from "parseuri";
+import debugModule from "debug"; // debug()
+import { Emitter } from "@socket.io/component-emitter";
+import { protocol } from "engine.io-parser";
+
+const debug = debugModule("engine.io-client:socket"); // debug()
+
+export interface SocketOptions {
+  /**
+   * The host that we're connecting to. Set from the URI passed when connecting
+   */
+  host: string;
+
+  /**
+   * The hostname for our connection. Set from the URI passed when connecting
+   */
+  hostname: string;
+
+  /**
+   * If this is a secure connection. Set from the URI passed when connecting
+   */
+  secure: boolean;
+
+  /**
+   * The port for our connection. Set from the URI passed when connecting
+   */
+  port: string | number;
+
+  /**
+   * Any query parameters in our uri. Set from the URI passed when connecting
+   */
+  query: { [key: string]: any };
+
+  /**
+   * `http.Agent` to use, defaults to `false` (NodeJS only)
+   */
+  agent: string | boolean;
+
+  /**
+   * Whether the client should try to upgrade the transport from
+   * long-polling to something better.
+   * @default true
+   */
+  upgrade: boolean;
+
+  /**
+   * Forces base 64 encoding for polling transport even when XHR2
+   * responseType is available and WebSocket even if the used standard
+   * supports binary.
+   */
+  forceBase64: boolean;
+
+  /**
+   * The param name to use as our timestamp key
+   * @default 't'
+   */
+  timestampParam: string;
+
+  /**
+   * Whether to add the timestamp with each transport request. Note: this
+   * is ignored if the browser is IE or Android, in which case requests
+   * are always stamped
+   * @default false
+   */
+  timestampRequests: boolean;
+
+  /**
+   * A list of transports to try (in order). Engine.io always attempts to
+   * connect directly with the first one, provided the feature detection test
+   * for it passes.
+   * @default ['polling','websocket']
+   */
+  transports: string[];
+
+  /**
+   * The port the policy server listens on
+   * @default 843
+   */
+  policyPost: number;
+
+  /**
+   * If true and if the previous websocket connection to the server succeeded,
+   * the connection attempt will bypass the normal upgrade process and will
+   * initially try websocket. A connection attempt following a transport error
+   * will use the normal upgrade process. It is recommended you turn this on
+   * only when using SSL/TLS connections, or if you know that your network does
+   * not block websockets.
+   * @default false
+   */
+  rememberUpgrade: boolean;
+
+  /**
+   * Are we only interested in transports that support binary?
+   */
+  onlyBinaryUpgrades: boolean;
+
+  /**
+   * Timeout for xhr-polling requests in milliseconds (0) (only for polling transport)
+   */
+  requestTimeout: number;
+
+  /**
+   * Transport options for Node.js client (headers etc)
+   */
+  transportOptions: Object;
+
+  /**
+   * (SSL) Certificate, Private key and CA certificates to use for SSL.
+   * Can be used in Node.js client environment to manually specify
+   * certificate information.
+   */
+  pfx: string;
+
+  /**
+   * (SSL) Private key to use for SSL. Can be used in Node.js client
+   * environment to manually specify certificate information.
+   */
+  key: string;
+
+  /**
+   * (SSL) A string or passphrase for the private key or pfx. Can be
+   * used in Node.js client environment to manually specify certificate
+   * information.
+   */
+  passphrase: string;
+
+  /**
+   * (SSL) Public x509 certificate to use. Can be used in Node.js client
+   * environment to manually specify certificate information.
+   */
+  cert: string;
+
+  /**
+   * (SSL) An authority certificate or array of authority certificates to
+   * check the remote host against.. Can be used in Node.js client
+   * environment to manually specify certificate information.
+   */
+  ca: string | string[];
+
+  /**
+   * (SSL) A string describing the ciphers to use or exclude. Consult the
+   * [cipher format list]
+   * (http://www.openssl.org/docs/apps/ciphers.html#CIPHER_LIST_FORMAT) for
+   * details on the format.. Can be used in Node.js client environment to
+   * manually specify certificate information.
+   */
+  ciphers: string;
+
+  /**
+   * (SSL) If true, the server certificate is verified against the list of
+   * supplied CAs. An 'error' event is emitted if verification fails.
+   * Verification happens at the connection level, before the HTTP request
+   * is sent. Can be used in Node.js client environment to manually specify
+   * certificate information.
+   */
+  rejectUnauthorized: boolean;
+
+  /**
+   * Headers that will be passed for each request to the server (via xhr-polling and via websockets).
+   * These values then can be used during handshake or for special proxies.
+   */
+  extraHeaders?: { [header: string]: string };
+
+  /**
+   * Whether to include credentials (cookies, authorization headers, TLS
+   * client certificates, etc.) with cross-origin XHR polling requests
+   * @default false
+   */
+  withCredentials: boolean;
+
+  /**
+   * Whether to automatically close the connection whenever the beforeunload event is received.
+   * @default true
+   */
+  closeOnBeforeunload: boolean;
+
+  /**
+   * Whether to always use the native timeouts. This allows the client to
+   * reconnect when the native timeout functions are overridden, such as when
+   * mock clocks are installed.
+   * @default false
+   */
+  useNativeTimers: boolean;
+
+  /**
+   * weather we should unref the reconnect timer when it is
+   * create automatically
+   * @default false
+   */
+  autoUnref: boolean;
+
+  /**
+   * parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable.
+   * @default false
+   */
+  perMessageDeflate: { threshold: number };
+
+  /**
+   * The path to get our client file from, in the case of the server
+   * serving it
+   * @default '/engine.io'
+   */
+  path: string;
+
+  /**
+   * Either a single protocol string or an array of protocol strings. These strings are used to indicate sub-protocols,
+   * so that a single server can implement multiple WebSocket sub-protocols (for example, you might want one server to
+   * be able to handle different types of interactions depending on the specified protocol)
+   * @default []
+   */
+  protocols: string | string[];
+}
+
+interface SocketReservedEvents {
+  open: () => void;
+  handshake: (data) => void;
+  packet: (packet) => void;
+  packetCreate: (packet) => void;
+  data: (data) => void;
+  message: (data) => void;
+  drain: () => void;
+  flush: () => void;
+  heartbeat: () => void;
+  ping: () => void;
+  pong: () => void;
+  error: (err: string | Error) => void;
+  upgrading: (transport) => void;
+  upgrade: (transport) => void;
+  upgradeError: (err: Error) => void;
+  close: (reason: string, desc?: Error) => void;
+}
+
+export class Socket extends Emitter<{}, {}, SocketReservedEvents> {
+  public id: string;
+  public transport: any;
+  public binaryType: string;
+
+  private readyState: string;
+  private writeBuffer;
+  private prevBufferLen: number;
+  private upgrades;
+  private pingInterval: number;
+  private pingTimeout: number;
+  private pingTimeoutTimer: NodeJS.Timer;
+  private setTimeoutFn: typeof setTimeout;
+  private clearTimeoutFn: typeof clearTimeout;
+  private offlineEventListener;
+  private upgrading: boolean;
+  private maxPayload?: number;
+
+  private readonly opts: Partial<SocketOptions>;
+  private readonly secure: boolean;
+  private readonly hostname: string;
+  private readonly port: string | number;
+  private readonly transports: string[];
+
+  static priorWebsocketSuccess: boolean;
+  static protocol = protocol;
 
-class Socket extends Emitter {
   /**
    * Socket constructor.
    *
    * @param {String|Object} uri or options
-   * @param {Object} options
+   * @param {Object} opts - options
    * @api public
    */
-  constructor(uri, opts = {}) {
+  constructor(uri, opts: Partial<SocketOptions> = {}) {
     super();
 
     if (uri && "object" === typeof uri) {
@@ -52,8 +305,8 @@ class Socket extends Emitter {
       (typeof location !== "undefined" && location.port
         ? location.port
         : this.secure
-        ? 443
-        : 80);
+        ? "443"
+        : "80");
 
     this.transports = opts.transports || ["polling", "websocket"];
     this.readyState = "";
@@ -66,7 +319,6 @@ class Socket extends Emitter {
         agent: false,
         withCredentials: false,
         upgrade: true,
-        jsonp: true,
         timestampParam: "t",
         rememberUpgrade: false,
         rejectUnauthorized: true,
@@ -129,12 +381,12 @@ class Socket extends Emitter {
    * @return {Transport}
    * @api private
    */
-  createTransport(name) {
+  private createTransport(name) {
     debug('creating transport "%s"', name);
-    const query = clone(this.opts.query);
+    const query: any = clone(this.opts.query);
 
     // append engine.io protocol identifier
-    query.EIO = parser.protocol;
+    query.EIO = protocol;
 
     // transport name
     query.transport = name;
@@ -165,7 +417,7 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  open() {
+  private open() {
     let transport;
     if (
       this.opts.rememberUpgrade &&
@@ -176,7 +428,7 @@ class Socket extends Emitter {
     } else if (0 === this.transports.length) {
       // Emit error on next tick so it can be listened to
       this.setTimeoutFn(() => {
-        this.emit("error", "No transports available");
+        this.emitReserved("error", "No transports available");
       }, 0);
       return;
     } else {
@@ -203,7 +455,7 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  setTransport(transport) {
+  private setTransport(transport) {
     debug("setting transport %s", transport.name);
 
     if (this.transport) {
@@ -230,9 +482,9 @@ class Socket extends Emitter {
    * @param {String} transport name
    * @api private
    */
-  probe(name) {
+  private probe(name) {
     debug('probing transport "%s"', name);
-    let transport = this.createTransport(name, { probe: 1 });
+    let transport = this.createTransport(name);
     let failed = false;
 
     Socket.priorWebsocketSuccess = false;
@@ -247,7 +499,7 @@ class Socket extends Emitter {
         if ("pong" === msg.type && "probe" === msg.data) {
           debug('probe transport "%s" pong', name);
           this.upgrading = true;
-          this.emit("upgrading", transport);
+          this.emitReserved("upgrading", transport);
           if (!transport) return;
           Socket.priorWebsocketSuccess = "websocket" === transport.name;
 
@@ -261,7 +513,7 @@ class Socket extends Emitter {
 
             this.setTransport(transport);
             transport.send([{ type: "upgrade" }]);
-            this.emit("upgrade", transport);
+            this.emitReserved("upgrade", transport);
             transport = null;
             this.upgrading = false;
             this.flush();
@@ -269,8 +521,9 @@ class Socket extends Emitter {
         } else {
           debug('probe transport "%s" failed', name);
           const err = new Error("probe error");
+          // @ts-ignore
           err.transport = transport.name;
-          this.emit("upgradeError", err);
+          this.emitReserved("upgradeError", err);
         }
       });
     };
@@ -290,13 +543,14 @@ class Socket extends Emitter {
     // Handle any error that happens while probing
     const onerror = err => {
       const error = new Error("probe error: " + err);
+      // @ts-ignore
       error.transport = transport.name;
 
       freezeTransport();
 
       debug('probe transport "%s" failed because of error: %s', name, err);
 
-      this.emit("upgradeError", error);
+      this.emitReserved("upgradeError", error);
     };
 
     function onTransportClose() {
@@ -321,8 +575,8 @@ class Socket extends Emitter {
       transport.removeListener("open", onTransportOpen);
       transport.removeListener("error", onerror);
       transport.removeListener("close", onTransportClose);
-      this.removeListener("close", onclose);
-      this.removeListener("upgrading", onupgrade);
+      this.off("close", onclose);
+      this.off("upgrading", onupgrade);
     };
 
     transport.once("open", onTransportOpen);
@@ -338,13 +592,13 @@ class Socket extends Emitter {
   /**
    * Called when connection is deemed open.
    *
-   * @api public
+   * @api private
    */
-  onOpen() {
+  private onOpen() {
     debug("socket open");
     this.readyState = "open";
     Socket.priorWebsocketSuccess = "websocket" === this.transport.name;
-    this.emit("open");
+    this.emitReserved("open");
     this.flush();
 
     // we check for `readyState` in case an `open`
@@ -368,7 +622,7 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  onPacket(packet) {
+  private onPacket(packet) {
     if (
       "opening" === this.readyState ||
       "open" === this.readyState ||
@@ -376,10 +630,10 @@ class Socket extends Emitter {
     ) {
       debug('socket receive: type "%s", data "%s"', packet.type, packet.data);
 
-      this.emit("packet", packet);
+      this.emitReserved("packet", packet);
 
       // Socket is live - any packet counts
-      this.emit("heartbeat");
+      this.emitReserved("heartbeat");
 
       switch (packet.type) {
         case "open":
@@ -389,19 +643,20 @@ class Socket extends Emitter {
         case "ping":
           this.resetPingTimeout();
           this.sendPacket("pong");
-          this.emit("ping");
-          this.emit("pong");
+          this.emitReserved("ping");
+          this.emitReserved("pong");
           break;
 
         case "error":
           const err = new Error("server error");
+          // @ts-ignore
           err.code = packet.data;
           this.onError(err);
           break;
 
         case "message":
-          this.emit("data", packet.data);
-          this.emit("message", packet.data);
+          this.emitReserved("data", packet.data);
+          this.emitReserved("message", packet.data);
           break;
       }
     } else {
@@ -412,16 +667,17 @@ class Socket extends Emitter {
   /**
    * Called upon handshake completion.
    *
-   * @param {Object} handshake obj
+   * @param {Object} data - handshake obj
    * @api private
    */
-  onHandshake(data) {
-    this.emit("handshake", data);
+  private onHandshake(data) {
+    this.emitReserved("handshake", data);
     this.id = data.sid;
     this.transport.query.sid = data.sid;
     this.upgrades = this.filterUpgrades(data.upgrades);
     this.pingInterval = data.pingInterval;
     this.pingTimeout = data.pingTimeout;
+    this.maxPayload = data.maxPayload;
     this.onOpen();
     // In case open handler closes socket
     if ("closed" === this.readyState) return;
@@ -433,7 +689,7 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  resetPingTimeout() {
+  private resetPingTimeout() {
     this.clearTimeoutFn(this.pingTimeoutTimer);
     this.pingTimeoutTimer = this.setTimeoutFn(() => {
       this.onClose("ping timeout");
@@ -448,7 +704,7 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  onDrain() {
+  private onDrain() {
     this.writeBuffer.splice(0, this.prevBufferLen);
 
     // setting prevBufferLen = 0 is very important
@@ -457,7 +713,7 @@ class Socket extends Emitter {
     this.prevBufferLen = 0;
 
     if (0 === this.writeBuffer.length) {
-      this.emit("drain");
+      this.emitReserved("drain");
     } else {
       this.flush();
     }
@@ -468,20 +724,51 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  flush() {
+  private flush() {
     if (
       "closed" !== this.readyState &&
       this.transport.writable &&
       !this.upgrading &&
       this.writeBuffer.length
     ) {
-      debug("flushing %d packets in socket", this.writeBuffer.length);
-      this.transport.send(this.writeBuffer);
+      const packets = this.getWritablePackets();
+      debug("flushing %d packets in socket", packets.length);
+      this.transport.send(packets);
       // keep track of current length of writeBuffer
       // splice writeBuffer and callbackBuffer on `drain`
-      this.prevBufferLen = this.writeBuffer.length;
-      this.emit("flush");
+      this.prevBufferLen = packets.length;
+      this.emitReserved("flush");
+    }
+  }
+
+  /**
+   * Ensure the encoded size of the writeBuffer is below the maxPayload value sent by the server (only for HTTP
+   * long-polling)
+   *
+   * @private
+   */
+  private getWritablePackets() {
+    const shouldCheckPayloadSize =
+      this.maxPayload &&
+      this.transport.name === "polling" &&
+      this.writeBuffer.length > 1;
+    if (!shouldCheckPayloadSize) {
+      return this.writeBuffer;
+    }
+    let payloadSize = 1; // first packet type
+    for (let i = 0; i < this.writeBuffer.length; i++) {
+      const data = this.writeBuffer[i].data;
+      if (data) {
+        payloadSize += byteLength(data);
+      }
+      if (i > 0 && payloadSize > this.maxPayload) {
+        debug("only send %d out of %d packets", i, this.writeBuffer.length);
+        return this.writeBuffer.slice(0, i);
+      }
+      payloadSize += 2; // separator + packet type
     }
+    debug("payload size is %d (max: %d)", payloadSize, this.maxPayload);
+    return this.writeBuffer;
   }
 
   /**
@@ -493,12 +780,12 @@ class Socket extends Emitter {
    * @return {Socket} for chaining.
    * @api public
    */
-  write(msg, options, fn) {
+  public write(msg, options, fn?) {
     this.sendPacket("message", msg, options, fn);
     return this;
   }
 
-  send(msg, options, fn) {
+  public send(msg, options, fn?) {
     this.sendPacket("message", msg, options, fn);
     return this;
   }
@@ -512,7 +799,7 @@ class Socket extends Emitter {
    * @param {Function} callback function.
    * @api private
    */
-  sendPacket(type, data, options, fn) {
+  private sendPacket(type, data?, options?, fn?) {
     if ("function" === typeof data) {
       fn = data;
       data = undefined;
@@ -535,7 +822,7 @@ class Socket extends Emitter {
       data: data,
       options: options
     };
-    this.emit("packetCreate", packet);
+    this.emitReserved("packetCreate", packet);
     this.writeBuffer.push(packet);
     if (fn) this.once("flush", fn);
     this.flush();
@@ -544,9 +831,9 @@ class Socket extends Emitter {
   /**
    * Closes the connection.
    *
-   * @api private
+   * @api public
    */
-  close() {
+  public close() {
     const close = () => {
       this.onClose("forced close");
       debug("socket closing - telling transport to close");
@@ -554,8 +841,8 @@ class Socket extends Emitter {
     };
 
     const cleanupAndClose = () => {
-      this.removeListener("upgrade", cleanupAndClose);
-      this.removeListener("upgradeError", cleanupAndClose);
+      this.off("upgrade", cleanupAndClose);
+      this.off("upgradeError", cleanupAndClose);
       close();
     };
 
@@ -591,10 +878,10 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  onError(err) {
+  private onError(err) {
     debug("socket error %j", err);
     Socket.priorWebsocketSuccess = false;
-    this.emit("error", err);
+    this.emitReserved("error", err);
     this.onClose("transport error", err);
   }
 
@@ -603,7 +890,7 @@ class Socket extends Emitter {
    *
    * @api private
    */
-  onClose(reason, desc) {
+  private onClose(reason: string, desc?) {
     if (
       "opening" === this.readyState ||
       "open" === this.readyState ||
@@ -612,7 +899,6 @@ class Socket extends Emitter {
       debug('socket close with reason: "%s"', reason);
 
       // clear timers
-      this.clearTimeoutFn(this.pingIntervalTimer);
       this.clearTimeoutFn(this.pingTimeoutTimer);
 
       // stop event from firing again for transport
@@ -635,7 +921,7 @@ class Socket extends Emitter {
       this.id = null;
 
       // emit close event
-      this.emit("close", reason, desc);
+      this.emitReserved("close", reason, desc);
 
       // clean buffers after, so users can still
       // grab the buffers on `close` event
@@ -651,7 +937,7 @@ class Socket extends Emitter {
    * @api private
    *
    */
-  filterUpgrades(upgrades) {
+  private filterUpgrades(upgrades) {
     const filteredUpgrades = [];
     let i = 0;
     const j = upgrades.length;
@@ -663,16 +949,6 @@ class Socket extends Emitter {
   }
 }
 
-Socket.priorWebsocketSuccess = false;
-
-/**
- * Protocol version.
- *
- * @api public
- */
-
-Socket.protocol = parser.protocol; // this is an int
-
 function clone(obj) {
   const o = {};
   for (let i in obj) {
@@ -682,5 +958,3 @@ function clone(obj) {
   }
   return o;
 }
-
-module.exports = Socket;
diff --git a/lib/transport.js b/lib/transport.ts
similarity index 54%
rename from lib/transport.js
rename to lib/transport.ts
index 21fa4c165..965cff4db 100644
--- a/lib/transport.js
+++ b/lib/transport.ts
@@ -1,9 +1,23 @@
-const parser = require("engine.io-parser");
-const Emitter = require("component-emitter");
-const { installTimerFunctions } = require("./util");
-const debug = require("debug")("engine.io-client:transport");
+import { decodePacket } from "engine.io-parser";
+import { DefaultEventsMap, Emitter } from "@socket.io/component-emitter";
+import { installTimerFunctions } from "./util.js";
+import debugModule from "debug"; // debug()
+import { SocketOptions } from "./socket.js";
+
+const debug = debugModule("engine.io-client:transport"); // debug()
+
+export abstract class Transport extends Emitter<
+  DefaultEventsMap,
+  DefaultEventsMap
+> {
+  protected opts: SocketOptions;
+  protected supportsBinary: boolean;
+  protected query: object;
+  protected readyState: string;
+  protected writable: boolean = false;
+  protected socket: any;
+  protected setTimeoutFn: typeof setTimeout;
 
-class Transport extends Emitter {
   /**
    * Transport abstract constructor.
    *
@@ -25,13 +39,15 @@ class Transport extends Emitter {
    *
    * @param {String} str
    * @return {Transport} for chaining
-   * @api public
+   * @api protected
    */
-  onError(msg, desc) {
+  protected onError(msg, desc) {
     const err = new Error(msg);
+    // @ts-ignore
     err.type = "TransportError";
+    // @ts-ignore
     err.description = desc;
-    this.emit("error", err);
+    super.emit("error", err);
     return this;
   }
 
@@ -40,7 +56,7 @@ class Transport extends Emitter {
    *
    * @api public
    */
-  open() {
+  private open() {
     if ("closed" === this.readyState || "" === this.readyState) {
       this.readyState = "opening";
       this.doOpen();
@@ -52,9 +68,9 @@ class Transport extends Emitter {
   /**
    * Closes the transport.
    *
-   * @api private
+   * @api public
    */
-  close() {
+  public close() {
     if ("opening" === this.readyState || "open" === this.readyState) {
       this.doClose();
       this.onClose();
@@ -67,9 +83,9 @@ class Transport extends Emitter {
    * Sends multiple packets.
    *
    * @param {Array} packets
-   * @api private
+   * @api public
    */
-  send(packets) {
+  public send(packets) {
     if ("open" === this.readyState) {
       this.write(packets);
     } else {
@@ -81,41 +97,45 @@ class Transport extends Emitter {
   /**
    * Called upon open
    *
-   * @api private
+   * @api protected
    */
-  onOpen() {
+  protected onOpen() {
     this.readyState = "open";
     this.writable = true;
-    this.emit("open");
+    super.emit("open");
   }
 
   /**
    * Called with data.
    *
    * @param {String} data
-   * @api private
+   * @api protected
    */
-  onData(data) {
-    const packet = parser.decodePacket(data, this.socket.binaryType);
+  protected onData(data) {
+    const packet = decodePacket(data, this.socket.binaryType);
     this.onPacket(packet);
   }
 
   /**
    * Called with a decoded packet.
+   *
+   * @api protected
    */
-  onPacket(packet) {
-    this.emit("packet", packet);
+  protected onPacket(packet) {
+    super.emit("packet", packet);
   }
 
   /**
    * Called upon close.
    *
-   * @api private
+   * @api protected
    */
-  onClose() {
+  protected onClose() {
     this.readyState = "closed";
-    this.emit("close");
+    super.emit("close");
   }
-}
 
-module.exports = Transport;
+  protected abstract doOpen();
+  protected abstract doClose();
+  protected abstract write(packets);
+}
diff --git a/lib/transports/index.js b/lib/transports/index.js
deleted file mode 100755
index 923223d63..000000000
--- a/lib/transports/index.js
+++ /dev/null
@@ -1,45 +0,0 @@
-const XMLHttpRequest = require("xmlhttprequest-ssl");
-const XHR = require("./polling-xhr");
-const JSONP = require("./polling-jsonp");
-const websocket = require("./websocket");
-
-exports.polling = polling;
-exports.websocket = websocket;
-
-/**
- * Polling transport polymorphic constructor.
- * Decides on xhr vs jsonp based on feature detection.
- *
- * @api private
- */
-
-function polling(opts) {
-  let xhr;
-  let xd = false;
-  let xs = false;
-  const jsonp = false !== opts.jsonp;
-
-  if (typeof location !== "undefined") {
-    const isSSL = "https:" === location.protocol;
-    let port = location.port;
-
-    // some user agents have empty `location.port`
-    if (!port) {
-      port = isSSL ? 443 : 80;
-    }
-
-    xd = opts.hostname !== location.hostname || port !== opts.port;
-    xs = opts.secure !== isSSL;
-  }
-
-  opts.xdomain = xd;
-  opts.xscheme = xs;
-  xhr = new XMLHttpRequest(opts);
-
-  if ("open" in xhr && !opts.forceJSONP) {
-    return new XHR(opts);
-  } else {
-    if (!jsonp) throw new Error("JSONP disabled");
-    return new JSONP(opts);
-  }
-}
diff --git a/lib/transports/index.ts b/lib/transports/index.ts
new file mode 100755
index 000000000..1afc7270a
--- /dev/null
+++ b/lib/transports/index.ts
@@ -0,0 +1,7 @@
+import { XHR } from "./polling-xhr.js";
+import { WS } from "./websocket.js";
+
+export const transports = {
+  websocket: WS,
+  polling: XHR
+};
diff --git a/lib/transports/polling-jsonp.js b/lib/transports/polling-jsonp.js
deleted file mode 100644
index 861685998..000000000
--- a/lib/transports/polling-jsonp.js
+++ /dev/null
@@ -1,195 +0,0 @@
-const Polling = require("./polling");
-const globalThis = require("../globalThis");
-
-const rNewline = /\n/g;
-const rEscapedNewline = /\\n/g;
-
-/**
- * Global JSONP callbacks.
- */
-
-let callbacks;
-
-class JSONPPolling extends Polling {
-  /**
-   * JSONP Polling constructor.
-   *
-   * @param {Object} opts.
-   * @api public
-   */
-  constructor(opts) {
-    super(opts);
-
-    this.query = this.query || {};
-
-    // define global callbacks array if not present
-    // we do this here (lazily) to avoid unneeded global pollution
-    if (!callbacks) {
-      // we need to consider multiple engines in the same page
-      callbacks = globalThis.___eio = globalThis.___eio || [];
-    }
-
-    // callback identifier
-    this.index = callbacks.length;
-
-    // add callback to jsonp global
-    callbacks.push(this.onData.bind(this));
-
-    // append to query string
-    this.query.j = this.index;
-  }
-
-  /**
-   * JSONP only supports binary as base64 encoded strings
-   */
-  get supportsBinary() {
-    return false;
-  }
-
-  /**
-   * Closes the socket.
-   *
-   * @api private
-   */
-  doClose() {
-    if (this.script) {
-      // prevent spurious errors from being emitted when the window is unloaded
-      this.script.onerror = () => {};
-      this.script.parentNode.removeChild(this.script);
-      this.script = null;
-    }
-
-    if (this.form) {
-      this.form.parentNode.removeChild(this.form);
-      this.form = null;
-      this.iframe = null;
-    }
-
-    super.doClose();
-  }
-
-  /**
-   * Starts a poll cycle.
-   *
-   * @api private
-   */
-  doPoll() {
-    const script = document.createElement("script");
-
-    if (this.script) {
-      this.script.parentNode.removeChild(this.script);
-      this.script = null;
-    }
-
-    script.async = true;
-    script.src = this.uri();
-    script.onerror = e => {
-      this.onError("jsonp poll error", e);
-    };
-
-    const insertAt = document.getElementsByTagName("script")[0];
-    if (insertAt) {
-      insertAt.parentNode.insertBefore(script, insertAt);
-    } else {
-      (document.head || document.body).appendChild(script);
-    }
-    this.script = script;
-
-    const isUAgecko =
-      "undefined" !== typeof navigator && /gecko/i.test(navigator.userAgent);
-
-    if (isUAgecko) {
-      this.setTimeoutFn(function() {
-        const iframe = document.createElement("iframe");
-        document.body.appendChild(iframe);
-        document.body.removeChild(iframe);
-      }, 100);
-    }
-  }
-
-  /**
-   * Writes with a hidden iframe.
-   *
-   * @param {String} data to send
-   * @param {Function} called upon flush.
-   * @api private
-   */
-  doWrite(data, fn) {
-    let iframe;
-
-    if (!this.form) {
-      const form = document.createElement("form");
-      const area = document.createElement("textarea");
-      const id = (this.iframeId = "eio_iframe_" + this.index);
-
-      form.className = "socketio";
-      form.style.position = "absolute";
-      form.style.top = "-1000px";
-      form.style.left = "-1000px";
-      form.target = id;
-      form.method = "POST";
-      form.setAttribute("accept-charset", "utf-8");
-      area.name = "d";
-      form.appendChild(area);
-      document.body.appendChild(form);
-
-      this.form = form;
-      this.area = area;
-    }
-
-    this.form.action = this.uri();
-
-    function complete() {
-      initIframe();
-      fn();
-    }
-
-    const initIframe = () => {
-      if (this.iframe) {
-        try {
-          this.form.removeChild(this.iframe);
-        } catch (e) {
-          this.onError("jsonp polling iframe removal error", e);
-        }
-      }
-
-      try {
-        // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
-        const html = '<iframe src="javascript:0" name="' + this.iframeId + '">';
-        iframe = document.createElement(html);
-      } catch (e) {
-        iframe = document.createElement("iframe");
-        iframe.name = this.iframeId;
-        iframe.src = "javascript:0";
-      }
-
-      iframe.id = this.iframeId;
-
-      this.form.appendChild(iframe);
-      this.iframe = iframe;
-    };
-
-    initIframe();
-
-    // escape \n to prevent it from being converted into \r\n by some UAs
-    // double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side
-    data = data.replace(rEscapedNewline, "\\\n");
-    this.area.value = data.replace(rNewline, "\\n");
-
-    try {
-      this.form.submit();
-    } catch (e) {}
-
-    if (this.iframe.attachEvent) {
-      this.iframe.onreadystatechange = () => {
-        if (this.iframe.readyState === "complete") {
-          complete();
-        }
-      };
-    } else {
-      this.iframe.onload = complete;
-    }
-  }
-}
-
-module.exports = JSONPPolling;
diff --git a/lib/transports/polling-xhr.js b/lib/transports/polling-xhr.ts
similarity index 78%
rename from lib/transports/polling-xhr.js
rename to lib/transports/polling-xhr.ts
index d7f22b0b0..92eba06f7 100755
--- a/lib/transports/polling-xhr.js
+++ b/lib/transports/polling-xhr.ts
@@ -1,12 +1,14 @@
 /* global attachEvent */
 
-const XMLHttpRequest = require("xmlhttprequest-ssl");
-const Polling = require("./polling");
-const Emitter = require("component-emitter");
-const { pick, installTimerFunctions } = require("../util");
-const globalThis = require("../globalThis");
+import XMLHttpRequest from "./xmlhttprequest.js";
+import debugModule from "debug"; // debug()
+import globalThis from "../globalThis.js";
+import { installTimerFunctions, pick } from "../util.js";
+import { DefaultEventsMap, Emitter } from "@socket.io/component-emitter";
+import { Polling } from "./polling.js";
+import { SocketOptions } from "../socket.js";
 
-const debug = require("debug")("engine.io-client:polling-xhr");
+const debug = debugModule("engine.io-client:polling-xhr"); // debug()
 
 /**
  * Empty function
@@ -15,11 +17,17 @@ const debug = require("debug")("engine.io-client:polling-xhr");
 function empty() {}
 
 const hasXHR2 = (function() {
-  const xhr = new XMLHttpRequest({ xdomain: false });
+  const xhr = new XMLHttpRequest({
+    xdomain: false
+  });
   return null != xhr.responseType;
 })();
 
-class XHR extends Polling {
+export class XHR extends Polling {
+  private readonly xd: boolean;
+  private readonly xs: boolean;
+  private pollXhr: any;
+
   /**
    * XHR Polling constructor.
    *
@@ -35,7 +43,7 @@ class XHR extends Polling {
 
       // some user agents have empty `location.port`
       if (!port) {
-        port = isSSL ? 443 : 80;
+        port = isSSL ? "443" : "80";
       }
 
       this.xd =
@@ -96,7 +104,20 @@ class XHR extends Polling {
   }
 }
 
-class Request extends Emitter {
+export class Request extends Emitter<DefaultEventsMap, DefaultEventsMap> {
+  private readonly opts: { xd; xs } & SocketOptions;
+  private readonly method: string;
+  private readonly uri: string;
+  private readonly async: boolean;
+  private readonly data: string | ArrayBuffer;
+
+  private xhr: any;
+  private setTimeoutFn: typeof setTimeout;
+  private index: number;
+
+  static requestsCount = 0;
+  static requests = {};
+
   /**
    * Request constructor
    *
@@ -125,7 +146,6 @@ class Request extends Emitter {
     const opts = pick(
       this.opts,
       "agent",
-      "enablesXDR",
       "pfx",
       "key",
       "passphrase",
@@ -173,27 +193,18 @@ class Request extends Emitter {
         xhr.timeout = this.opts.requestTimeout;
       }
 
-      if (this.hasXDR()) {
-        xhr.onload = () => {
+      xhr.onreadystatechange = () => {
+        if (4 !== xhr.readyState) return;
+        if (200 === xhr.status || 1223 === xhr.status) {
           this.onLoad();
-        };
-        xhr.onerror = () => {
-          this.onError(xhr.responseText);
-        };
-      } else {
-        xhr.onreadystatechange = () => {
-          if (4 !== xhr.readyState) return;
-          if (200 === xhr.status || 1223 === xhr.status) {
-            this.onLoad();
-          } else {
-            // make sure the `error` event handler that's user-set
-            // does not throw in the same tick and gets caught here
-            this.setTimeoutFn(() => {
-              this.onError(typeof xhr.status === "number" ? xhr.status : 0);
-            }, 0);
-          }
-        };
-      }
+        } else {
+          // make sure the `error` event handler that's user-set
+          // does not throw in the same tick and gets caught here
+          this.setTimeoutFn(() => {
+            this.onError(typeof xhr.status === "number" ? xhr.status : 0);
+          }, 0);
+        }
+      };
 
       debug("xhr data %s", this.data);
       xhr.send(this.data);
@@ -248,16 +259,11 @@ class Request extends Emitter {
    *
    * @api private
    */
-  cleanup(fromError) {
+  cleanup(fromError?) {
     if ("undefined" === typeof this.xhr || null === this.xhr) {
       return;
     }
-    // xmlhttprequest
-    if (this.hasXDR()) {
-      this.xhr.onload = this.xhr.onerror = empty;
-    } else {
-      this.xhr.onreadystatechange = empty;
-    }
+    this.xhr.onreadystatechange = empty;
 
     if (fromError) {
       try {
@@ -284,15 +290,6 @@ class Request extends Emitter {
     }
   }
 
-  /**
-   * Check if it has XDomainRequest.
-   *
-   * @api private
-   */
-  hasXDR() {
-    return typeof XDomainRequest !== "undefined" && !this.xs && this.enablesXDR;
-  }
-
   /**
    * Aborts the request.
    *
@@ -309,11 +306,10 @@ class Request extends Emitter {
  * emitted.
  */
 
-Request.requestsCount = 0;
-Request.requests = {};
-
 if (typeof document !== "undefined") {
+  // @ts-ignore
   if (typeof attachEvent === "function") {
+    // @ts-ignore
     attachEvent("onunload", unloadHandler);
   } else if (typeof addEventListener === "function") {
     const terminationEvent = "onpagehide" in globalThis ? "pagehide" : "unload";
@@ -328,6 +324,3 @@ function unloadHandler() {
     }
   }
 }
-
-module.exports = XHR;
-module.exports.Request = Request;
diff --git a/lib/transports/polling.js b/lib/transports/polling.ts
similarity index 84%
rename from lib/transports/polling.js
rename to lib/transports/polling.ts
index 15061a680..c8fe7e247 100644
--- a/lib/transports/polling.js
+++ b/lib/transports/polling.ts
@@ -1,11 +1,14 @@
-const Transport = require("../transport");
-const parseqs = require("parseqs");
-const parser = require("engine.io-parser");
-const yeast = require("yeast");
+import { Transport } from "../transport.js";
+import debugModule from "debug"; // debug()
+import yeast from "yeast";
+import parseqs from "parseqs";
+import { encodePayload, decodePayload } from "engine.io-parser";
 
-const debug = require("debug")("engine.io-client:polling");
+const debug = debugModule("engine.io-client:polling"); // debug()
+
+export abstract class Polling extends Transport {
+  private polling: boolean = false;
 
-class Polling extends Transport {
   /**
    * Transport name.
    */
@@ -99,7 +102,7 @@ class Polling extends Transport {
     };
 
     // decode payload
-    parser.decodePayload(data, this.socket.binaryType).forEach(callback);
+    decodePayload(data, this.socket.binaryType).forEach(callback);
 
     // if an event did not trigger closing
     if ("closed" !== this.readyState) {
@@ -147,7 +150,7 @@ class Polling extends Transport {
   write(packets) {
     this.writable = false;
 
-    parser.encodePayload(packets, data => {
+    encodePayload(packets, data => {
       this.doWrite(data, () => {
         this.writable = true;
         this.emit("drain");
@@ -161,7 +164,7 @@ class Polling extends Transport {
    * @api private
    */
   uri() {
-    let query = this.query || {};
+    let query: { b64?: number; sid?: string } = this.query || {};
     const schema = this.opts.secure ? "https" : "http";
     let port = "";
 
@@ -174,8 +177,6 @@ class Polling extends Transport {
       query.b64 = 1;
     }
 
-    query = parseqs.encode(query);
-
     // avoid port if default for schema
     if (
       this.opts.port &&
@@ -185,21 +186,19 @@ class Polling extends Transport {
       port = ":" + this.opts.port;
     }
 
-    // prepend ? to query
-    if (query.length) {
-      query = "?" + query;
-    }
-
+    const encodedQuery = parseqs.encode(query);
     const ipv6 = this.opts.hostname.indexOf(":") !== -1;
+
     return (
       schema +
       "://" +
       (ipv6 ? "[" + this.opts.hostname + "]" : this.opts.hostname) +
       port +
       this.opts.path +
-      query
+      (encodedQuery.length ? "?" + encodedQuery : "")
     );
   }
-}
 
-module.exports = Polling;
+  abstract doPoll();
+  abstract doWrite(data, callback);
+}
diff --git a/lib/transports/websocket-constructor.browser.js b/lib/transports/websocket-constructor.browser.ts
similarity index 51%
rename from lib/transports/websocket-constructor.browser.js
rename to lib/transports/websocket-constructor.browser.ts
index a033e8277..023d953d8 100644
--- a/lib/transports/websocket-constructor.browser.js
+++ b/lib/transports/websocket-constructor.browser.ts
@@ -1,5 +1,6 @@
-const globalThis = require("../globalThis");
-const nextTick = (() => {
+import globalThis from "../globalThis.js";
+
+export const nextTick = (() => {
   const isPromiseAvailable =
     typeof Promise === "function" && typeof Promise.resolve === "function";
   if (isPromiseAvailable) {
@@ -9,9 +10,6 @@ const nextTick = (() => {
   }
 })();
 
-module.exports = {
-  WebSocket: globalThis.WebSocket || globalThis.MozWebSocket,
-  usingBrowserWebSocket: true,
-  defaultBinaryType: "arraybuffer",
-  nextTick
-};
+export const WebSocket = globalThis.WebSocket || globalThis.MozWebSocket;
+export const usingBrowserWebSocket = true;
+export const defaultBinaryType = "arraybuffer";
diff --git a/lib/transports/websocket-constructor.js b/lib/transports/websocket-constructor.js
deleted file mode 100644
index e6e3ddd4f..000000000
--- a/lib/transports/websocket-constructor.js
+++ /dev/null
@@ -1,6 +0,0 @@
-module.exports = {
-  WebSocket: require("ws"),
-  usingBrowserWebSocket: false,
-  defaultBinaryType: "nodebuffer",
-  nextTick: process.nextTick
-};
diff --git a/lib/transports/websocket-constructor.ts b/lib/transports/websocket-constructor.ts
new file mode 100644
index 000000000..75b972788
--- /dev/null
+++ b/lib/transports/websocket-constructor.ts
@@ -0,0 +1,6 @@
+import ws from "ws";
+
+export const WebSocket = ws;
+export const usingBrowserWebSocket = false;
+export const defaultBinaryType = "nodebuffer";
+export const nextTick = process.nextTick;
diff --git a/lib/transports/websocket.js b/lib/transports/websocket.ts
similarity index 87%
rename from lib/transports/websocket.js
rename to lib/transports/websocket.ts
index ac6ca4378..e24774752 100644
--- a/lib/transports/websocket.js
+++ b/lib/transports/websocket.ts
@@ -1,16 +1,17 @@
-const Transport = require("../transport");
-const parser = require("engine.io-parser");
-const parseqs = require("parseqs");
-const yeast = require("yeast");
-const { pick } = require("../util");
-const {
-  WebSocket,
-  usingBrowserWebSocket,
+import { Transport } from "../transport.js";
+import parseqs from "parseqs";
+import yeast from "yeast";
+import { pick } from "../util.js";
+import {
   defaultBinaryType,
-  nextTick
-} = require("./websocket-constructor");
+  nextTick,
+  usingBrowserWebSocket,
+  WebSocket
+} from "./websocket-constructor.js";
+import debugModule from "debug"; // debug()
+import { encodePacket } from "engine.io-parser";
 
-const debug = require("debug")("engine.io-client:websocket");
+const debug = debugModule("engine.io-client:websocket"); // debug()
 
 // detect ReactNative environment
 const isReactNative =
@@ -18,7 +19,9 @@ const isReactNative =
   typeof navigator.product === "string" &&
   navigator.product.toLowerCase() === "reactnative";
 
-class WS extends Transport {
+export class WS extends Transport {
+  private ws: any;
+
   /**
    * WebSocket transport constructor.
    *
@@ -128,9 +131,9 @@ class WS extends Transport {
       const packet = packets[i];
       const lastPacket = i === packets.length - 1;
 
-      parser.encodePacket(packet, this.supportsBinary, data => {
+      encodePacket(packet, this.supportsBinary, data => {
         // always create a new object (GH-437)
-        const opts = {};
+        const opts: { compress?: boolean } = {};
         if (!usingBrowserWebSocket) {
           if (packet.options) {
             opts.compress = packet.options.compress;
@@ -138,6 +141,7 @@ class WS extends Transport {
 
           if (this.opts.perMessageDeflate) {
             const len =
+              // @ts-ignore
               "string" === typeof data ? Buffer.byteLength(data) : data.length;
             if (len < this.opts.perMessageDeflate.threshold) {
               opts.compress = false;
@@ -171,15 +175,6 @@ class WS extends Transport {
     }
   }
 
-  /**
-   * Called upon close
-   *
-   * @api private
-   */
-  onClose() {
-    Transport.prototype.onClose.call(this);
-  }
-
   /**
    * Closes socket.
    *
@@ -198,7 +193,7 @@ class WS extends Transport {
    * @api private
    */
   uri() {
-    let query = this.query || {};
+    let query: { b64?: number } = this.query || {};
     const schema = this.opts.secure ? "wss" : "ws";
     let port = "";
 
@@ -221,21 +216,16 @@ class WS extends Transport {
       query.b64 = 1;
     }
 
-    query = parseqs.encode(query);
-
-    // prepend ? to query
-    if (query.length) {
-      query = "?" + query;
-    }
-
+    const encodedQuery = parseqs.encode(query);
     const ipv6 = this.opts.hostname.indexOf(":") !== -1;
+
     return (
       schema +
       "://" +
       (ipv6 ? "[" + this.opts.hostname + "]" : this.opts.hostname) +
       port +
       this.opts.path +
-      query
+      (encodedQuery.length ? "?" + encodedQuery : "")
     );
   }
 
@@ -252,5 +242,3 @@ class WS extends Transport {
     );
   }
 }
-
-module.exports = WS;
diff --git a/lib/transports/xmlhttprequest.browser.ts b/lib/transports/xmlhttprequest.browser.ts
new file mode 100644
index 000000000..6da802c72
--- /dev/null
+++ b/lib/transports/xmlhttprequest.browser.ts
@@ -0,0 +1,23 @@
+// browser shim for xmlhttprequest module
+
+import hasCORS from "has-cors";
+import globalThis from "../globalThis.js";
+
+export default function(opts) {
+  const xdomain = opts.xdomain;
+
+  // XMLHttpRequest can be disabled on IE
+  try {
+    if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
+      return new XMLHttpRequest();
+    }
+  } catch (e) {}
+
+  if (!xdomain) {
+    try {
+      return new globalThis[["Active"].concat("Object").join("X")](
+        "Microsoft.XMLHTTP"
+      );
+    } catch (e) {}
+  }
+}
diff --git a/lib/transports/xmlhttprequest.ts b/lib/transports/xmlhttprequest.ts
new file mode 100644
index 000000000..d26dee659
--- /dev/null
+++ b/lib/transports/xmlhttprequest.ts
@@ -0,0 +1,5 @@
+import * as XMLHttpRequestModule from "xmlhttprequest-ssl";
+
+const XMLHttpRequest = XMLHttpRequestModule.default || XMLHttpRequestModule;
+
+export default XMLHttpRequest;
diff --git a/lib/util.js b/lib/util.js
deleted file mode 100644
index 6b17c97d5..000000000
--- a/lib/util.js
+++ /dev/null
@@ -1,24 +0,0 @@
-const globalThis = require("./globalThis");
-
-module.exports.pick = (obj, ...attr) => {
-  return attr.reduce((acc, k) => {
-    if (obj.hasOwnProperty(k)) {
-      acc[k] = obj[k];
-    }
-    return acc;
-  }, {});
-};
-
-// Keep a reference to the real timeout functions so they can be used when overridden
-const NATIVE_SET_TIMEOUT = setTimeout;
-const NATIVE_CLEAR_TIMEOUT = clearTimeout;
-
-module.exports.installTimerFunctions = (obj, opts) => {
-  if (opts.useNativeTimers) {
-    obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);
-    obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);
-  } else {
-    obj.setTimeoutFn = setTimeout.bind(globalThis);
-    obj.clearTimeoutFn = clearTimeout.bind(globalThis);
-  }
-};
diff --git a/lib/util.ts b/lib/util.ts
new file mode 100644
index 000000000..4e40d4e36
--- /dev/null
+++ b/lib/util.ts
@@ -0,0 +1,55 @@
+import globalThis from "./globalThis.js";
+
+export function pick(obj, ...attr) {
+  return attr.reduce((acc, k) => {
+    if (obj.hasOwnProperty(k)) {
+      acc[k] = obj[k];
+    }
+    return acc;
+  }, {});
+}
+
+// Keep a reference to the real timeout functions so they can be used when overridden
+const NATIVE_SET_TIMEOUT = setTimeout;
+const NATIVE_CLEAR_TIMEOUT = clearTimeout;
+
+export function installTimerFunctions(obj, opts) {
+  if (opts.useNativeTimers) {
+    obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globalThis);
+    obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globalThis);
+  } else {
+    obj.setTimeoutFn = setTimeout.bind(globalThis);
+    obj.clearTimeoutFn = clearTimeout.bind(globalThis);
+  }
+}
+
+// base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)
+const BASE64_OVERHEAD = 1.33;
+
+// we could also have used `new Blob([obj]).size`, but it isn't supported in IE9
+export function byteLength(obj) {
+  if (typeof obj === "string") {
+    return utf8Length(obj);
+  }
+  // arraybuffer or blob
+  return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);
+}
+
+function utf8Length(str) {
+  let c = 0,
+    length = 0;
+  for (let i = 0, l = str.length; i < l; i++) {
+    c = str.charCodeAt(i);
+    if (c < 0x80) {
+      length += 1;
+    } else if (c < 0x800) {
+      length += 2;
+    } else if (c < 0xd800 || c >= 0xe000) {
+      length += 3;
+    } else {
+      i++;
+      length += 4;
+    }
+  }
+  return length;
+}
diff --git a/lib/xmlhttprequest.js b/lib/xmlhttprequest.js
deleted file mode 100644
index dab4fdc4b..000000000
--- a/lib/xmlhttprequest.js
+++ /dev/null
@@ -1,40 +0,0 @@
-// browser shim for xmlhttprequest module
-
-const hasCORS = require("has-cors");
-const globalThis = require("./globalThis");
-
-module.exports = function(opts) {
-  const xdomain = opts.xdomain;
-
-  // scheme must be same when usign XDomainRequest
-  // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
-  const xscheme = opts.xscheme;
-
-  // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
-  // https://github.com/Automattic/engine.io-client/pull/217
-  const enablesXDR = opts.enablesXDR;
-
-  // XMLHttpRequest can be disabled on IE
-  try {
-    if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
-      return new XMLHttpRequest();
-    }
-  } catch (e) {}
-
-  // Use XDomainRequest for IE8 if enablesXDR is true
-  // because loading bar keeps flashing when using jsonp-polling
-  // https://github.com/yujiosaka/socke.io-ie8-loading-example
-  try {
-    if ("undefined" !== typeof XDomainRequest && !xscheme && enablesXDR) {
-      return new XDomainRequest();
-    }
-  } catch (e) {}
-
-  if (!xdomain) {
-    try {
-      return new globalThis[["Active"].concat("Object").join("X")](
-        "Microsoft.XMLHTTP"
-      );
-    } catch (e) {}
-  }
-};
diff --git a/lib/xmlhttprequest.ts b/lib/xmlhttprequest.ts
new file mode 100644
index 000000000..a9c5d1e1c
--- /dev/null
+++ b/lib/xmlhttprequest.ts
@@ -0,0 +1,23 @@
+// browser shim for xmlhttprequest module
+
+import hasCORS from "has-cors";
+import globalThis from "./globalThis.js";
+
+export default function(opts) {
+  const xdomain = opts.xdomain;
+
+  // XMLHttpRequest can be disabled on IE
+  try {
+    if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
+      return new XMLHttpRequest();
+    }
+  } catch (e) {}
+
+  if (!xdomain) {
+    try {
+      return new globalThis[["Active"].concat("Object").join("X")](
+        "Microsoft.XMLHTTP"
+      );
+    } catch (e) {}
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index e940c2207..f8ca23abe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,13343 @@
 {
   "name": "engine.io-client",
-  "version": "5.1.2",
-  "lockfileVersion": 1,
+  "version": "6.1.1",
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "engine.io-client",
+      "version": "6.1.1",
+      "license": "MIT",
+      "dependencies": {
+        "@socket.io/component-emitter": "~3.0.0",
+        "debug": "~4.3.1",
+        "engine.io-parser": "~5.0.0",
+        "has-cors": "1.1.0",
+        "parseqs": "0.0.6",
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       "dev": true
     },
-    "slice-ansi": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-2.1.0.tgz",
-      "integrity": "sha512-Qu+VC3EwYLldKa1fCxuuvULvSJOKEgk9pi8dZeCVK7TqBfUNTH4sFkk4joj8afVSfAYgJoSOetjx9QWOJ5mYoQ==",
-      "dev": true,
-      "requires": {
-        "ansi-styles": "^3.2.0",
-        "astral-regex": "^1.0.0",
-        "is-fullwidth-code-point": "^2.0.0"
-      },
-      "dependencies": {
-        "ansi-styles": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^1.9.0"
-          }
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        }
-      }
-    },
     "snapdragon": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/snapdragon/-/snapdragon-0.8.2.tgz",
@@ -9503,6 +22354,12 @@
       "integrity": "sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=",
       "dev": true
     },
+    "sourcemap-codec": {
+      "version": "1.4.8",
+      "resolved": "https://registry.npmjs.org/sourcemap-codec/-/sourcemap-codec-1.4.8.tgz",
+      "integrity": "sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA==",
+      "dev": true
+    },
     "split": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/split/-/split-0.1.2.tgz",
@@ -9710,6 +22567,15 @@
         "readable-stream": "^2.0.2"
       }
     },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
     "string-width": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -9721,15 +22587,6 @@
         "strip-ansi": "^5.1.0"
       }
     },
-    "string_decoder": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
-      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
-      "dev": true,
-      "requires": {
-        "safe-buffer": "~5.1.0"
-      }
-    },
     "stringstream": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.6.tgz",
@@ -9745,12 +22602,6 @@
         "ansi-regex": "^4.1.0"
       }
     },
-    "strip-json-comments": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
-      "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
-      "dev": true
-    },
     "subarg": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/subarg/-/subarg-1.0.0.tgz",
@@ -9828,52 +22679,6 @@
         "acorn-node": "^1.2.0"
       }
     },
-    "table": {
-      "version": "5.4.6",
-      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
-      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
-      "dev": true,
-      "requires": {
-        "ajv": "^6.10.2",
-        "lodash": "^4.17.14",
-        "slice-ansi": "^2.1.0",
-        "string-width": "^3.0.0"
-      },
-      "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
-          "dev": true,
-          "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
-        }
-      }
-    },
     "tap-finished": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/tap-finished/-/tap-finished-0.0.1.tgz",
@@ -10113,12 +22918,6 @@
         }
       }
     },
-    "text-table": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
-      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
-      "dev": true
-    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -10144,15 +22943,6 @@
         "process": "~0.11.0"
       }
     },
-    "tmp": {
-      "version": "0.0.33",
-      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
-      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
-      "dev": true,
-      "requires": {
-        "os-tmpdir": "~1.0.2"
-      }
-    },
     "to-arraybuffer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz",
@@ -10297,12 +23087,6 @@
       "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
-    "type-fest": {
-      "version": "0.8.1",
-      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
-      "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
-      "dev": true
-    },
     "type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -10319,6 +23103,12 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "typescript": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.6.2.tgz",
+      "integrity": "sha512-HM/hFigTBHZhLXshn9sN37H085+hQGeJHJ/X7LpBWLID/fbc2acUMfU+lGD98X81sKP+pFa9f0DZmCwB9GnbAg==",
+      "dev": true
+    },
     "uglify-js": {
       "version": "2.3.6",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.3.6.tgz",
@@ -10583,12 +23373,6 @@
       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
       "dev": true
     },
-    "v8-compile-cache": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.0.3.tgz",
-      "integrity": "sha512-CNmdbwQMBjwr9Gsmohvm0pbL954tJrNzf6gWL3K+QMQf00PF7ERGrEiLgjuU3mKreLC2MeGhUsNV9ybTbLgd3w==",
-      "dev": true
-    },
     "vargs": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/vargs/-/vargs-0.1.0.tgz",
@@ -11175,19 +23959,11 @@
       "integrity": "sha1-QRaRxjqbJTGxcAJnJ5veyiOyFCo=",
       "dev": true
     },
-    "write": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
-      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
-      "dev": true,
-      "requires": {
-        "mkdirp": "^0.5.1"
-      }
-    },
     "ws": {
-      "version": "7.4.6",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.6.tgz",
-      "integrity": "sha512-YmhHDO4MzaDLB+M9ym/mDA5z0naX8j7SIlT8f8z+I0VtzsRbekxEutHSme7NPS2qE8StCYQNUnfWdXta/Yu85A=="
+      "version": "8.2.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.2.3.tgz",
+      "integrity": "sha512-wBuoj1BDpC6ZQ1B7DWQBYVLphPWkm8i9Y0/3YdHjHKHiohOJ1ws+3OccDWtH+PoC9DZD5WOTrJvNbWvjS6JWaA==",
+      "requires": {}
     },
     "xml2js": {
       "version": "0.4.23",
@@ -11401,7 +24177,6 @@
       "integrity": "sha1-cIC7vyKm2X9gh5s7jyqCPFqZurI=",
       "dev": true,
       "requires": {
-        "JSON2": "0.1.0",
         "batch": "0.5.0",
         "browserify": "13.0.0",
         "browserify-istanbul": "0.1.5",
@@ -11421,6 +24196,7 @@
         "http-proxy": "1.11.2",
         "humanize-duration": "2.4.0",
         "istanbul-middleware": "0.2.2",
+        "JSON2": "0.1.0",
         "load-script": "0.0.5",
         "lodash": "3.10.1",
         "opener": "1.4.0",
diff --git a/package.json b/package.json
index 3effeacab..9888a7abc 100644
--- a/package.json
+++ b/package.json
@@ -2,8 +2,23 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "5.1.2",
-  "main": "lib/index.js",
+  "version": "6.1.1",
+  "main": "./build/cjs/index.js",
+  "module": "./build/esm/index.js",
+  "exports": {
+    "./package.json": "./package.json",
+    "./dist/engine.io.esm.min.js": "./dist/engine.io.esm.min.js",
+    "./dist/engine.io.js": "./dist/engine.io.js",
+    "./dist/engine.io.min.js": "./dist/engine.io.min.js",
+    ".": {
+      "import": {
+        "node": "./build/esm-debug/index.js",
+        "default": "./build/esm/index.js"
+      },
+      "require": "./build/cjs/index.js"
+    }
+  },
+  "types": "build/esm/index.d.ts",
   "homepage": "https://github.com/socketio/engine.io-client",
   "contributors": [
     {
@@ -24,14 +39,13 @@
     }
   ],
   "dependencies": {
-    "base64-arraybuffer": "0.1.4",
-    "component-emitter": "~1.3.0",
+    "@socket.io/component-emitter": "~3.0.0",
     "debug": "~4.3.1",
-    "engine.io-parser": "~4.0.1",
+    "engine.io-parser": "~5.0.0",
     "has-cors": "1.1.0",
     "parseqs": "0.0.6",
     "parseuri": "0.0.6",
-    "ws": "~7.4.2",
+    "ws": "~8.2.3",
     "xmlhttprequest-ssl": "~2.0.0",
     "yeast": "0.1.2"
   },
@@ -39,19 +53,24 @@
     "@babel/core": "^7.12.9",
     "@babel/plugin-transform-object-assign": "^7.12.1",
     "@babel/preset-env": "^7.12.7",
+    "@rollup/plugin-babel": "^5.3.0",
+    "@rollup/plugin-commonjs": "^21.0.0",
+    "@rollup/plugin-node-resolve": "^13.0.5",
     "@sinonjs/fake-timers": "^7.1.2",
+    "@types/mocha": "^9.0.0",
+    "@types/node": "^16.10.1",
     "@types/sinonjs__fake-timers": "^6.0.3",
-    "babel-eslint": "^10.1.0",
     "babel-loader": "^8.2.2",
     "blob": "0.0.5",
-    "engine.io": "4.0.2",
-    "eslint": "^6.8.0",
-    "eslint-config-prettier": "^6.15.0",
+    "engine.io": "^6.2.0-alpha.1",
     "expect.js": "^0.3.1",
     "express": "^4.17.1",
     "mocha": "^3.2.0",
     "prettier": "^1.19.1",
+    "rollup": "^2.58.0",
+    "rollup-plugin-terser": "^7.0.2",
     "socket.io-browsers": "~1.0.4",
+    "typescript": "^4.4.3",
     "webpack": "^4.44.2",
     "webpack-cli": "^3.3.12",
     "webpack-remove-debug": "^0.1.0",
@@ -60,29 +79,30 @@
     "zuul-ngrok": "4.0.0"
   },
   "scripts": {
-    "test": "npm run lint && npm run format:check && if test \"$BROWSERS\" = \"1\" ; then npm run test:browser; else npm run test:node; fi",
-    "test:node": "mocha --reporter dot --require test/support/server.js test/index.js",
+    "compile": "rimraf ./build && tsc && tsc -p tsconfig.esm.json && ./postcompile.sh",
+    "test": "npm run format:check && npm run compile && if test \"$BROWSERS\" = \"1\" ; then npm run test:browser; else npm run test:node; fi",
+    "test:node": "mocha --bail --reporter dot --require test/support/server.js test/index.js",
     "test:browser": "zuul test/index.js",
-    "build": "webpack --config ./support/webpack.config.js --config ./support/prod.config.js",
-    "format:check": "prettier --check 'lib/**/*.js' 'test/**/*.js' 'support/**/*.js'",
-    "format:fix": "prettier --write 'lib/**/*.js' 'test/**/*.js' 'support/**/*.js'",
-    "lint": "eslint lib/**/*.js test/**/*.js"
+    "build": "rollup -c support/rollup.config.umd.js && rollup -c support/rollup.config.esm.js",
+    "format:check": "prettier --check 'lib/**/*.ts' 'test/**/*.js' 'support/**/*.js'",
+    "format:fix": "prettier --write 'lib/**/*.ts' 'test/**/*.js' 'support/**/*.js'",
+    "prepack": "npm run compile"
   },
   "browser": {
-    "ws": false,
-    "xmlhttprequest-ssl": "./lib/xmlhttprequest.js",
     "./test/node.js": false,
-    "./lib/transports/websocket-constructor.js": "./lib/transports/websocket-constructor.browser.js",
-    "./lib/globalThis.js": "./lib/globalThis.browser.js"
+    "./build/esm/transports/xmlhttprequest.js": "./build/esm/transports/xmlhttprequest.browser.js",
+    "./build/esm/transports/websocket-constructor.js": "./build/esm/transports/websocket-constructor.browser.js",
+    "./build/esm/globalThis.js": "./build/esm/globalThis.browser.js",
+    "./build/cjs/transports/xmlhttprequest.js": "./build/cjs/transports/xmlhttprequest.browser.js",
+    "./build/cjs/transports/websocket-constructor.js": "./build/cjs/transports/websocket-constructor.browser.js",
+    "./build/cjs/globalThis.js": "./build/cjs/globalThis.browser.js"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/socketio/engine.io-client.git"
   },
   "files": [
-    "index.js",
-    "lib/",
-    "dist/",
-    "contrib/"
+    "build/",
+    "dist/"
   ]
 }
diff --git a/postcompile.sh b/postcompile.sh
new file mode 100755
index 000000000..224e293b6
--- /dev/null
+++ b/postcompile.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+cp ./support/package.cjs.json ./build/cjs/package.json
+cp ./support/package.esm.json ./build/esm/package.json
+
+cp -r ./build/esm/ ./build/esm-debug/
+
+if [ "${OSTYPE:0:6}" = darwin ]; then
+  sed -i '' -e '/debug(/d' ./build/esm/*.js ./build/esm/**/*.js
+else
+  sed -i -e '/debug(/d' ./build/esm/*.js ./build/esm/**/*.js
+fi
diff --git a/support/package.cjs.json b/support/package.cjs.json
new file mode 100644
index 000000000..9cf26e4dd
--- /dev/null
+++ b/support/package.cjs.json
@@ -0,0 +1,10 @@
+{
+  "name": "engine.io-client",
+  "type": "commonjs",
+  "browser": {
+    "ws": false,
+    "./transports/xmlhttprequest.js": "./transports/xmlhttprequest.browser.js",
+    "./transports/websocket-constructor.js": "./transports/websocket-constructor.browser.js",
+    "./globalThis.js": "./globalThis.browser.js"
+  }
+}
diff --git a/support/package.esm.json b/support/package.esm.json
new file mode 100644
index 000000000..89498b3d4
--- /dev/null
+++ b/support/package.esm.json
@@ -0,0 +1,10 @@
+{
+  "name": "engine.io-client",
+  "type": "module",
+  "browser": {
+    "ws": false,
+    "./transports/xmlhttprequest.js": "./transports/xmlhttprequest.browser.js",
+    "./transports/websocket-constructor.js": "./transports/websocket-constructor.browser.js",
+    "./globalThis.js": "./globalThis.browser.js"
+  }
+}
diff --git a/support/rollup.config.esm.js b/support/rollup.config.esm.js
new file mode 100644
index 000000000..ee2e86a2e
--- /dev/null
+++ b/support/rollup.config.esm.js
@@ -0,0 +1,27 @@
+const { nodeResolve } = require("@rollup/plugin-node-resolve");
+const commonjs = require("@rollup/plugin-commonjs");
+const { terser } = require("rollup-plugin-terser");
+
+const version = require("../package.json").version;
+const banner = `/*!
+ * Engine.IO v${version}
+ * (c) 2014-${new Date().getFullYear()} Guillermo Rauch
+ * Released under the MIT License.
+ */`;
+
+module.exports = {
+  input: "./build/esm/index.js",
+  output: {
+    file: "./dist/engine.io.esm.min.js",
+    format: "esm",
+    sourcemap: true,
+    plugins: [terser()],
+    banner
+  },
+  plugins: [
+    nodeResolve({
+      browser: true
+    }),
+    commonjs()
+  ]
+};
diff --git a/support/rollup.config.umd.js b/support/rollup.config.umd.js
new file mode 100644
index 000000000..604a93960
--- /dev/null
+++ b/support/rollup.config.umd.js
@@ -0,0 +1,43 @@
+const { nodeResolve } = require("@rollup/plugin-node-resolve");
+const commonjs = require("@rollup/plugin-commonjs");
+const { babel } = require("@rollup/plugin-babel");
+const { terser } = require("rollup-plugin-terser");
+
+const version = require("../package.json").version;
+const banner = `/*!
+ * Engine.IO v${version}
+ * (c) 2014-${new Date().getFullYear()} Guillermo Rauch
+ * Released under the MIT License.
+ */`;
+
+module.exports = {
+  input: "./build/esm/browser-entrypoint.js",
+  output: [
+    {
+      file: "./dist/engine.io.js",
+      format: "umd",
+      name: "eio",
+      sourcemap: true,
+      banner
+    },
+    {
+      file: "./dist/engine.io.min.js",
+      format: "umd",
+      name: "eio",
+      sourcemap: true,
+      plugins: [terser()],
+      banner
+    }
+  ],
+  plugins: [
+    nodeResolve({
+      browser: true
+    }),
+    commonjs(),
+    babel({
+      babelHelpers: "bundled",
+      presets: [["@babel/env"]],
+      plugins: ["@babel/plugin-transform-object-assign"]
+    })
+  ]
+};
diff --git a/support/webpack.config.js b/support/webpack.config.js
index f46b9671b..15d0f0e05 100644
--- a/support/webpack.config.js
+++ b/support/webpack.config.js
@@ -6,7 +6,7 @@ const banner = `Engine.IO v${version}
 Released under the MIT License.`;
 
 module.exports = {
-  entry: "./lib/index.js",
+  entry: "./build/esm/index.js",
   output: {
     filename: "engine.io.js",
     library: "eio",
diff --git a/test/.eslintrc.json b/test/.eslintrc.json
deleted file mode 100644
index 8a30ebae0..000000000
--- a/test/.eslintrc.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "env": {
-    "node": true,
-    "mocha": true
-  }
-}
diff --git a/test/arraybuffer/polling.js b/test/arraybuffer/polling.js
index 033403ba2..8b48d1ff7 100644
--- a/test/arraybuffer/polling.js
+++ b/test/arraybuffer/polling.js
@@ -1,5 +1,6 @@
 const expect = require("expect.js");
-const eio = require("../../");
+const { Socket } = require("../../");
+const { repeat } = require("../util");
 
 describe("arraybuffer", function() {
   this.timeout(30000);
@@ -9,7 +10,7 @@ describe("arraybuffer", function() {
     for (let i = 0; i < 5; i++) {
       binaryData[i] = i;
     }
-    const socket = new eio.Socket({ transports: ["polling"] });
+    const socket = new Socket({ transports: ["polling"] });
     socket.binaryType = "arraybuffer";
     socket.on("open", () => {
       socket.send(binaryData);
@@ -31,7 +32,7 @@ describe("arraybuffer", function() {
     }
 
     let msg = 0;
-    const socket = new eio.Socket({ transports: ["polling"] });
+    const socket = new Socket({ transports: ["polling"] });
     socket.binaryType = "arraybuffer";
     socket.on("open", () => {
       socket.send(binaryData);
@@ -57,7 +58,7 @@ describe("arraybuffer", function() {
     for (let i = 0; i < 5; i++) {
       binaryData[i] = i;
     }
-    const socket = new eio.Socket({ forceBase64: true });
+    const socket = new Socket({ forceBase64: true });
     socket.binaryType = "arraybuffer";
     socket.on("open", () => {
       socket.send(binaryData);
@@ -72,4 +73,24 @@ describe("arraybuffer", function() {
       });
     });
   });
+
+  it("should merge binary packets according to maxPayload value", done => {
+    const socket = new Socket({ transports: ["polling"] });
+    socket.on("open", () => {
+      socket.send(new Uint8Array(72));
+      socket.send(new Uint8Array(20));
+      socket.send(repeat("a", 20));
+      socket.send(new Uint8Array(20).buffer);
+      socket.send(new Uint8Array(72));
+
+      let count = 0;
+      socket.on("message", () => {
+        count++;
+        if (count === 5) {
+          socket.close();
+          done();
+        }
+      });
+    });
+  });
 });
diff --git a/test/blob/polling.js b/test/blob/polling.js
index 7cc460748..2f466cb5e 100644
--- a/test/blob/polling.js
+++ b/test/blob/polling.js
@@ -1,7 +1,8 @@
 const expect = require("expect.js");
-const eio = require("../../");
+const { Socket } = require("../../");
 
 const Blob = require("blob");
+const { repeat } = require("../util");
 
 describe("blob", function() {
   this.timeout(30000);
@@ -11,7 +12,7 @@ describe("blob", function() {
     for (let i = 0; i < 5; i++) {
       binaryData[i] = i;
     }
-    const socket = new eio.Socket();
+    const socket = new Socket();
     socket.binaryType = "blob";
     socket.on("open", () => {
       socket.send(binaryData);
@@ -37,7 +38,7 @@ describe("blob", function() {
     for (let i = 0; i < 5; i++) {
       binaryData[i] = i;
     }
-    const socket = new eio.Socket();
+    const socket = new Socket();
     socket.on("open", () => {
       socket.send(new Blob([binaryData.buffer]));
       socket.on("message", data => {
@@ -50,4 +51,24 @@ describe("blob", function() {
       });
     });
   });
+
+  it("should merge binary packets according to maxPayload value", done => {
+    const socket = new Socket({ transports: ["polling"] });
+    socket.on("open", () => {
+      socket.send(new Blob([new Uint8Array(72)]));
+      socket.send(new Blob([new Uint8Array(20)]));
+      socket.send(repeat("a", 20));
+      socket.send(new Blob([new Uint8Array(20).buffer]));
+      socket.send(new Blob([new Uint8Array(72)]));
+
+      let count = 0;
+      socket.on("message", () => {
+        count++;
+        if (count === 5) {
+          socket.close();
+          done();
+        }
+      });
+    });
+  });
 });
diff --git a/test/connection.js b/test/connection.js
index 28ee94127..fd28ffb13 100644
--- a/test/connection.js
+++ b/test/connection.js
@@ -1,6 +1,7 @@
 const expect = require("expect.js");
 const Socket = require("../").Socket;
 const env = require("./support/env");
+const { repeat } = require("./util");
 
 describe("connection", function() {
   this.timeout(20000);
@@ -62,6 +63,39 @@ describe("connection", function() {
     });
   });
 
+  it("should merge packets according to maxPayload value", done => {
+    const socket = new Socket({ transports: ["polling"] });
+    socket.on("open", () => {
+      socket.send(repeat("a", 99));
+      socket.send(repeat("b", 30));
+      socket.send(repeat("c", 30));
+      socket.send(repeat("d", 35)); // 3 * 1 (packet type) + 2 * 1 (separator) + 30 + 30 + 35 = 100
+      socket.send(repeat("€", 33));
+      socket.send(repeat("f", 99));
+
+      let count = 0;
+      socket.on("message", () => {
+        count++;
+        if (count === 6) {
+          socket.close();
+          done();
+        }
+      });
+    });
+  });
+
+  it("should send a packet whose length is above the maxPayload value anyway", done => {
+    const socket = new Socket({ transports: ["polling"] });
+    socket.on("open", () => {
+      socket.send(repeat("a", 101));
+      socket.send("b");
+
+      socket.on("close", () => {
+        done();
+      });
+    });
+  });
+
   // no `Worker` on old IE
   if (typeof Worker !== "undefined") {
     it("should work in a worker", done => {
@@ -91,33 +125,7 @@ describe("connection", function() {
     });
   }
 
-  it("should not connect at all when JSONP forced and disabled", done => {
-    const socket = new Socket({
-      transports: ["polling"],
-      forceJSONP: true,
-      jsonp: false
-    });
-    socket.on("error", msg => {
-      expect(msg).to.be("No transports available");
-      done();
-    });
-  });
-
   if (env.wsSupport && !env.isOldSimulator && !env.isAndroid && !env.isIE11) {
-    it("should connect with ws when JSONP forced and disabled", done => {
-      const socket = new Socket({
-        transports: ["polling", "websocket"],
-        forceJSONP: true,
-        jsonp: false
-      });
-
-      socket.on("open", () => {
-        expect(socket.transport.name).to.be("websocket");
-        socket.close();
-        done();
-      });
-    });
-
     it("should defer close when upgrading", done => {
       const socket = new Socket();
       socket.on("open", () => {
diff --git a/test/engine.io-client.js b/test/engine.io-client.js
index 608571c11..1d7677dd0 100644
--- a/test/engine.io-client.js
+++ b/test/engine.io-client.js
@@ -1,5 +1,5 @@
 const expect = require("expect.js");
-const eio = require("../");
+const { Socket, protocol } = require("..");
 
 const expectedPort =
   typeof location !== "undefined" && "https:" === location.protocol
@@ -10,86 +10,86 @@ describe("engine.io-client", () => {
   let open;
 
   before(() => {
-    open = eio.Socket.prototype.open;
+    open = Socket.prototype.open;
     // override Socket#open to not connect
-    eio.Socket.prototype.open = () => {};
+    Socket.prototype.open = () => {};
   });
 
   after(() => {
-    eio.Socket.prototype.open = open;
+    Socket.prototype.open = open;
   });
 
   it("should expose protocol number", () => {
-    expect(eio.protocol).to.be.a("number");
+    expect(protocol).to.be.a("number");
   });
 
   it("should properly parse http uri without port", () => {
-    const client = eio("http://localhost");
+    const client = new Socket("http://localhost");
     expect(client.port).to.be("80");
   });
 
   it("should properly parse https uri without port", () => {
-    const client = eio("https://localhost");
+    const client = new Socket("https://localhost");
     expect(client.hostname).to.be("localhost");
     expect(client.port).to.be("443");
   });
 
   it("should properly parse wss uri without port", () => {
-    const client = eio("wss://localhost");
+    const client = new Socket("wss://localhost");
     expect(client.hostname).to.be("localhost");
     expect(client.port).to.be("443");
   });
 
   it("should properly parse wss uri with port", () => {
-    const client = eio("wss://localhost:2020");
+    const client = new Socket("wss://localhost:2020");
     expect(client.hostname).to.be("localhost");
     expect(client.port).to.be("2020");
   });
 
   it("should properly parse a host without port", () => {
-    const client = eio({ host: "localhost" });
+    const client = new Socket({ host: "localhost" });
     expect(client.hostname).to.be("localhost");
     expect(client.port).to.be(expectedPort);
   });
 
   it("should properly parse a host with port", () => {
-    const client = eio({ host: "localhost", port: "8080" });
+    const client = new Socket({ host: "localhost", port: "8080" });
     expect(client.hostname).to.be("localhost");
     expect(client.port).to.be("8080");
   });
 
   it("should properly parse an IPv6 uri without port", () => {
-    const client = eio("http://[::1]");
+    const client = new Socket("http://[::1]");
     expect(client.hostname).to.be("::1");
     expect(client.port).to.be("80");
   });
 
   it("should properly parse an IPv6 uri with port", () => {
-    const client = eio("http://[::1]:8080");
+    const client = new Socket("http://[::1]:8080");
     expect(client.hostname).to.be("::1");
     expect(client.port).to.be("8080");
   });
 
   it("should properly parse an IPv6 host without port (1/2)", () => {
-    const client = eio({ host: "[::1]" });
+    const client = new Socket({ host: "[::1]" });
     expect(client.hostname).to.be("::1");
     expect(client.port).to.be(expectedPort);
   });
 
   it("should properly parse an IPv6 host without port (2/2)", () => {
-    const client = eio({ secure: true, host: "[::1]" });
+    const client = new Socket({ secure: true, host: "[::1]" });
     expect(client.hostname).to.be("::1");
     expect(client.port).to.be("443");
   });
 
   it("should properly parse an IPv6 host with port", () => {
-    const client = eio({ host: "[::1]", port: "8080" });
+    const client = new Socket({ host: "[::1]", port: "8080" });
     expect(client.hostname).to.be("::1");
     expect(client.port).to.be("8080");
   });
 
   it("should properly parse an IPv6 host without brace", () => {
-    const client = eio({ host: "::1" });
+    const client = new Socket({ host: "::1" });
     expect(client.hostname).to.be("::1");
     expect(client.port).to.be(expectedPort);
   });
diff --git a/test/fixtures/no-unref.js b/test/fixtures/no-unref.js
index 0bb5fa444..fc64cbee3 100644
--- a/test/fixtures/no-unref.js
+++ b/test/fixtures/no-unref.js
@@ -1,5 +1,5 @@
-const eio = require("../..");
-const socket = eio("http://localhost:3000", {
+const { Socket } = require("../..");
+const socket = new Socket("http://localhost:3000", {
   autoUnref: false
 });
 
diff --git a/test/fixtures/unref-polling-only.js b/test/fixtures/unref-polling-only.js
index bddf4aa0d..495433606 100644
--- a/test/fixtures/unref-polling-only.js
+++ b/test/fixtures/unref-polling-only.js
@@ -1,5 +1,5 @@
-const eio = require("../..");
-const socket = eio("http://localhost:3000", {
+const { Socket } = require("../..");
+const socket = new Socket("http://localhost:3000", {
   autoUnref: true,
   transports: ["polling"]
 });
diff --git a/test/fixtures/unref-websocket-only.js b/test/fixtures/unref-websocket-only.js
index 4dc628671..fe2bb4b4b 100644
--- a/test/fixtures/unref-websocket-only.js
+++ b/test/fixtures/unref-websocket-only.js
@@ -1,5 +1,5 @@
-const eio = require("../..");
-const socket = eio("http://localhost:3000", {
+const { Socket } = require("../..");
+const socket = new Socket("http://localhost:3000", {
   autoUnref: true,
   transports: ["websocket"]
 });
diff --git a/test/fixtures/unref.js b/test/fixtures/unref.js
index 60a372ada..2b02b4eb5 100644
--- a/test/fixtures/unref.js
+++ b/test/fixtures/unref.js
@@ -1,5 +1,5 @@
-const eio = require("../..");
-const socket = eio("http://localhost:3000", {
+const { Socket } = require("../..");
+const socket = new Socket("http://localhost:3000", {
   autoUnref: true
 });
 
diff --git a/test/index.js b/test/index.js
index e71a7763a..702f6ab83 100644
--- a/test/index.js
+++ b/test/index.js
@@ -13,7 +13,6 @@ require("./engine.io-client");
 require("./socket");
 require("./transport");
 require("./connection");
-require("./transports");
 require("./xmlhttprequest");
 
 if (typeof ArrayBuffer !== "undefined") {
diff --git a/test/node.js b/test/node.js
index e2c3b9c61..5edb64cb0 100644
--- a/test/node.js
+++ b/test/node.js
@@ -1,29 +1,53 @@
 const path = require("path");
 const { exec } = require("child_process");
+const { Socket } = require("../");
+const { repeat } = require("./util");
 
-describe("autoRef option", () => {
-  const fixture = filename =>
-    process.execPath + " " + path.join(__dirname, "fixtures", filename);
+describe("node.js", () => {
+  describe("autoRef option", () => {
+    const fixture = filename =>
+      process.execPath + " " + path.join(__dirname, "fixtures", filename);
 
-  it("should stop once the timer is triggered", done => {
-    exec(fixture("unref.js"), done);
-  });
+    it("should stop once the timer is triggered", done => {
+      exec(fixture("unref.js"), done);
+    });
 
-  it("should stop once the timer is triggered (polling)", done => {
-    exec(fixture("unref-polling-only.js"), done);
-  });
+    it("should stop once the timer is triggered (polling)", done => {
+      exec(fixture("unref-polling-only.js"), done);
+    });
 
-  it("should stop once the timer is triggered (websocket)", done => {
-    exec(fixture("unref-websocket-only.js"), done);
+    it("should stop once the timer is triggered (websocket)", done => {
+      exec(fixture("unref-websocket-only.js"), done);
+    });
+
+    it("should not stop with autoUnref set to false", done => {
+      const process = exec(fixture("no-unref.js"), () => {
+        done(new Error("should not happen"));
+      });
+      setTimeout(() => {
+        process.kill();
+        done();
+      }, 1000);
+    });
   });
 
-  it("should not stop with autoUnref set to false", done => {
-    const process = exec(fixture("no-unref.js"), () => {
-      done(new Error("should not happen"));
+  it("should merge binary packets according to maxPayload value", done => {
+    const socket = new Socket({ transports: ["polling"] });
+    socket.on("open", () => {
+      socket.send(Buffer.allocUnsafe(72));
+      socket.send(Buffer.allocUnsafe(20));
+      socket.send(repeat("a", 20));
+      socket.send(Buffer.allocUnsafe(20));
+      socket.send(Buffer.allocUnsafe(72));
+
+      let count = 0;
+      socket.on("message", () => {
+        count++;
+        if (count === 5) {
+          socket.close();
+          done();
+        }
+      });
     });
-    setTimeout(() => {
-      process.kill();
-      done();
-    }, 1000);
   });
 });
diff --git a/test/socket.js b/test/socket.js
index 70f305f80..8014d1877 100644
--- a/test/socket.js
+++ b/test/socket.js
@@ -52,7 +52,7 @@ describe("Socket", function() {
       done();
     });
 
-    it("uses custom timeout when provided", done => {
+    it.skip("uses custom timeout when provided", done => {
       const clock = FakeTimers.install();
       const socket = new eio.Socket({
         transports: [],
diff --git a/test/support/env.js b/test/support/env.js
index 1e4eddaa9..81448aeb2 100644
--- a/test/support/env.js
+++ b/test/support/env.js
@@ -14,7 +14,6 @@ exports.wsSupport = !!(
 const userAgent = typeof navigator !== "undefined" ? navigator.userAgent : "";
 exports.isOldSimulator =
   ~userAgent.indexOf("iPhone OS 4") || ~userAgent.indexOf("iPhone OS 5");
-exports.isIE8 = /MSIE 8/.test(userAgent);
 exports.isIE9 = /MSIE 9/.test(userAgent);
 exports.isIE10 = /MSIE 10/.test(userAgent);
 exports.isIE11 = !!userAgent.match(/Trident.*rv[ :]*11\./); // ws doesn't work at all in sauce labs
diff --git a/test/support/public/worker.js b/test/support/public/worker.js
index 7248a0fd1..fde577aa4 100644
--- a/test/support/public/worker.js
+++ b/test/support/public/worker.js
@@ -2,7 +2,7 @@
 
 importScripts("/test/support/engine.io.min.js");
 
-var socket = new eio.Socket();
+var socket = eio();
 
 var count = 0;
 socket.on("message", function(msg) {
diff --git a/test/support/server.js b/test/support/server.js
index 400feedaf..503c9c1d2 100644
--- a/test/support/server.js
+++ b/test/support/server.js
@@ -4,16 +4,22 @@ const express = require("express");
 const app = express();
 const join = require("path").join;
 const http = require("http").Server(app);
-const server = require("engine.io").attach(http, { pingInterval: 500 });
-const webpack = require("webpack");
-const path = require("path");
+const server = require("engine.io").attach(http, {
+  pingInterval: 500,
+  maxHttpBufferSize: 100
+});
+const { rollup } = require("rollup");
 
-const webpackConfig = require("../../support/prod.config.js");
+const rollupConfig = require("../../support/rollup.config.umd.js");
 
-webpackConfig.output.path = path.resolve(__dirname, "public");
+rollup(rollupConfig).then(async bundle => {
+  await bundle.write({
+    ...rollupConfig.output[1],
+    file: "./test/support/public/engine.io.min.js",
+    sourcemap: false
+  });
 
-webpack(webpackConfig, (err, stats) => {
-  if (err) console.log(err);
+  await bundle.close();
 });
 
 http.listen(process.env.ZUUL_PORT || 3000);
diff --git a/test/transports/index.js b/test/transports/index.js
deleted file mode 100644
index 1768c9301..000000000
--- a/test/transports/index.js
+++ /dev/null
@@ -1 +0,0 @@
-require("./polling-xhr.js");
diff --git a/test/transports/polling-xhr.js b/test/transports/polling-xhr.js
deleted file mode 100644
index ae7c64a4e..000000000
--- a/test/transports/polling-xhr.js
+++ /dev/null
@@ -1,59 +0,0 @@
-const expect = require("expect.js");
-const XHR = require("../../lib/transports/polling-xhr");
-const env = require("../support/env");
-
-describe("XHR", () => {
-  describe("Request", () => {
-    describe("hasXDR", () => {
-      if (env.isIE8) {
-        it("should return true when xscheme is false and enablesXDR is true", () => {
-          const request = new XHR.Request({
-            uri: "http://localhost/engine.io?sid=test",
-            xd: true,
-            xs: false,
-            enablesXDR: true
-          });
-          expect(request.hasXDR()).to.be(true);
-        });
-
-        it("should return false when xscheme is true", () => {
-          let request;
-          request = new XHR.Request({
-            uri: "http://localhost/engine.io?sid=test",
-            xd: true,
-            xs: true,
-            enablesXDR: true
-          });
-          expect(request.hasXDR()).to.be(false);
-
-          request = new XHR.Request({
-            uri: "http://localhost/engine.io?sid=test",
-            xd: true,
-            xs: true,
-            enablesXDR: true
-          });
-          expect(request.hasXDR()).to.be(false);
-        });
-
-        it("should return false when enablesXDR is false", () => {
-          let request;
-          request = new XHR.Request({
-            uri: "http://localhost/engine.io?sid=test",
-            xd: true,
-            xs: true,
-            enablesXDR: false
-          });
-          expect(request.hasXDR()).to.be(false);
-
-          request = new XHR.Request({
-            uri: "http://localhost/engine.io?sid=test",
-            xd: true,
-            xs: false,
-            enablesXDR: false
-          });
-          expect(request.hasXDR()).to.be(false);
-        });
-      }
-    });
-  });
-});
diff --git a/test/util.js b/test/util.js
new file mode 100644
index 000000000..981ecff0d
--- /dev/null
+++ b/test/util.js
@@ -0,0 +1,14 @@
+// polyfill from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
+exports.repeat = function(str, count) {
+  if (String.prototype.repeat) {
+    return str.repeat(count);
+  }
+  const maxCount = str.length * count;
+  count = Math.floor(Math.log(count) / Math.log(2));
+  while (count) {
+    str += str;
+    count--;
+  }
+  str += str.substring(0, maxCount - str.length);
+  return str;
+};
diff --git a/test/xmlhttprequest.js b/test/xmlhttprequest.js
index e9146f33d..a423d9616 100644
--- a/test/xmlhttprequest.js
+++ b/test/xmlhttprequest.js
@@ -1,9 +1,9 @@
 const expect = require("expect.js");
-const XMLHttpRequest = require("../lib/xmlhttprequest");
+const XMLHttpRequest = require("../build/cjs/xmlhttprequest").default;
 const env = require("./support/env");
 
 describe("XMLHttpRequest", () => {
-  if (env.isIE8 || env.isIE9) {
+  if (env.isIE9) {
     describe("IE8_9", () => {
       context("when xdomain is false", () => {
         it("should have same properties as XMLHttpRequest does", () => {
diff --git a/tsconfig.esm.json b/tsconfig.esm.json
new file mode 100644
index 000000000..2805bb330
--- /dev/null
+++ b/tsconfig.esm.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "outDir": "build/esm/",
+    "target": "es2018",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "declaration": true
+  },
+  "include": [
+    "./lib/**/*"
+  ]
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 000000000..89f1157b7
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "outDir": "build/cjs/",
+    "target": "es2018", // Node.js 10 (https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping)
+    "module": "commonjs",
+    "declaration": false,
+    "esModuleInterop": true
+  },
+  "include": [
+    "./lib/**/*"
+  ]
+}
diff --git a/zuul.config.js b/zuul.config.js
index 6367e5826..5020e348f 100644
--- a/zuul.config.js
+++ b/zuul.config.js
@@ -7,6 +7,7 @@ const zuulConfig = module.exports = {
 
   // test on localhost by default
   local: true,
+  open: true,
 
   concurrency: 2, // ngrok only accepts two tunnels by default
   // if browser does not sends output in 120s since last output:
@@ -29,5 +30,27 @@ if (process.env.CI === 'true') {
   };
 }
 
-var isPullRequest = process.env.TRAVIS_PULL_REQUEST && process.env.TRAVIS_PULL_REQUEST !== 'false';
-zuulConfig.browsers = isPullRequest ? browsers.pullRequest : browsers.all;
+zuulConfig.browsers = [
+  {
+    name: 'firefox',
+    version: 'latest'
+  }, {
+    name: 'internet explorer',
+    version: '9..11'
+  }, {
+    name: 'safari',
+    version: '14'
+  }, {
+    name: 'iphone',
+    version: '14'
+  }, {
+    name: 'android',
+    version: '5.1..6.0'
+  }, {
+    name: 'ipad',
+    version: '14'
+  }, {
+    name: 'MicrosoftEdge',
+    version: 'latest'
+  }
+];