From dcb85e902d129b2d1a94943b4f6d471532f70dc9 Mon Sep 17 00:00:00 2001
From: Damien Arrachequesne <damien.arrachequesne@gmail.com>
Date: Thu, 29 Apr 2021 11:49:17 +0200
Subject: [PATCH 1/3] feat: add the "closeOnBeforeunload" option

Since [1], the socket is now closed when receiving the "beforeunload"
event in the browser.

This change was meant to fix a discrepancy between Chrome and Firefox
when the user reloads/closes a browser tab: Firefox would close the
connection (and emit a "disconnect" event, at the Socket.IO level), but
not Chrome (see [2]).

But it also closes the connection when there is another "beforeunload"
handler, for example when the user is prompted "are you sure you want
to leave this page?".

Note: calling "stopImmediatePropagation()" was a possible workaround:

```js
window.addEventListener('beforeunload', (event) => {
  event.preventDefault();
  event.stopImmediatePropagation();
  event.returnValue = 'are you sure you want to leave this page?';
});
```

This commit adds a "closeOnBeforeunload" option, which controls whether
a handler is registered for the "beforeunload" event.

Syntax:

```js
const socket = require('engine.io-client')('ws://localhost', {
  closeOnBeforeunload: false // defaults to true
});
```

[1]: https://github.com/socketio/engine.io-client/commit/ed48b5dc3407e5ded45072606b3bb0eafa49c01f
[2]: https://github.com/socketio/socket.io/issues/3639

Related:

- https://github.com/socketio/engine.io-client/issues/661
- https://github.com/socketio/engine.io-client/issues/658
- https://github.com/socketio/socket.io-client/issues/1451

Reference: https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event
---
 README.md     |  1 +
 lib/socket.js | 30 ++++++++++++++++++------------
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/README.md b/README.md
index c85dc87e4..247439328 100644
--- a/README.md
+++ b/README.md
@@ -267,6 +267,7 @@ Exposed as `eio` in the browser standalone build.
       - `requestTimeout` (`Number`): Timeout for xhr-polling requests in milliseconds (`0`)
     - **Websocket-only options**
       - `protocols` (`Array`): a list of subprotocols (see [MDN reference](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_servers#Subprotocols))
+      - `closeOnBeforeunload` (`Boolean`): whether to silently close the connection when the [`beforeunload`](https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event) event is emitted in the browser (defaults to `true`)
 - `send`
     - Sends a message to the server
     - **Parameters**
diff --git a/lib/socket.js b/lib/socket.js
index 7f939b31e..996a8c611 100644
--- a/lib/socket.js
+++ b/lib/socket.js
@@ -70,7 +70,8 @@ class Socket extends Emitter {
         perMessageDeflate: {
           threshold: 1024
         },
-        transportOptions: {}
+        transportOptions: {},
+        closeOnBeforeunload: true
       },
       opts
     );
@@ -91,17 +92,22 @@ class Socket extends Emitter {
     this.pingTimeoutTimer = null;
 
     if (typeof addEventListener === "function") {
-      addEventListener(
-        "beforeunload",
-        () => {
-          if (this.transport) {
-            // silently close the transport
-            this.transport.removeAllListeners();
-            this.transport.close();
-          }
-        },
-        false
-      );
+      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",
+          () => {
+            if (this.transport) {
+              // silently close the transport
+              this.transport.removeAllListeners();
+              this.transport.close();
+            }
+          },
+          false
+        );
+      }
       if (this.hostname !== "localhost") {
         this.offlineEventListener = () => {
           this.onClose("transport close");

From c46611ce44897ef27f111f34151455d57193588b Mon Sep 17 00:00:00 2001
From: Damien Arrachequesne <damien.arrachequesne@gmail.com>
Date: Tue, 4 May 2021 09:28:21 +0200
Subject: [PATCH 2/3] refactor: remove "self" references

---
 lib/socket.js                   | 111 ++++++++++++++------------------
 lib/transports/polling-jsonp.js |  33 ++++------
 lib/transports/polling-xhr.js   |  35 +++++-----
 lib/transports/polling.js       |  27 ++++----
 lib/transports/websocket.js     |  89 ++++++++++++-------------
 5 files changed, 127 insertions(+), 168 deletions(-)

diff --git a/lib/socket.js b/lib/socket.js
index 996a8c611..91346b970 100644
--- a/lib/socket.js
+++ b/lib/socket.js
@@ -172,9 +172,8 @@ class Socket extends Emitter {
       transport = "websocket";
     } else if (0 === this.transports.length) {
       // Emit error on next tick so it can be listened to
-      const self = this;
-      setTimeout(function() {
-        self.emit("error", "No transports available");
+      setTimeout(() => {
+        this.emit("error", "No transports available");
       }, 0);
       return;
     } else {
@@ -203,7 +202,6 @@ class Socket extends Emitter {
    */
   setTransport(transport) {
     debug("setting transport %s", transport.name);
-    const self = this;
 
     if (this.transport) {
       debug("clearing existing transport %s", this.transport.name);
@@ -215,17 +213,11 @@ class Socket extends Emitter {
 
     // set up transport listeners
     transport
-      .on("drain", function() {
-        self.onDrain();
-      })
-      .on("packet", function(packet) {
-        self.onPacket(packet);
-      })
-      .on("error", function(e) {
-        self.onError(e);
-      })
-      .on("close", function() {
-        self.onClose("transport close");
+      .on("drain", this.onDrain.bind(this))
+      .on("packet", this.onPacket.bind(this))
+      .on("error", this.onError.bind(this))
+      .on("close", () => {
+        this.onClose("transport close");
       });
   }
 
@@ -239,52 +231,46 @@ class Socket extends Emitter {
     debug('probing transport "%s"', name);
     let transport = this.createTransport(name, { probe: 1 });
     let failed = false;
-    const self = this;
 
     Socket.priorWebsocketSuccess = false;
 
-    function onTransportOpen() {
-      if (self.onlyBinaryUpgrades) {
-        const upgradeLosesBinary =
-          !this.supportsBinary && self.transport.supportsBinary;
-        failed = failed || upgradeLosesBinary;
-      }
+    const onTransportOpen = () => {
       if (failed) return;
 
       debug('probe transport "%s" opened', name);
       transport.send([{ type: "ping", data: "probe" }]);
-      transport.once("packet", function(msg) {
+      transport.once("packet", msg => {
         if (failed) return;
         if ("pong" === msg.type && "probe" === msg.data) {
           debug('probe transport "%s" pong', name);
-          self.upgrading = true;
-          self.emit("upgrading", transport);
+          this.upgrading = true;
+          this.emit("upgrading", transport);
           if (!transport) return;
           Socket.priorWebsocketSuccess = "websocket" === transport.name;
 
-          debug('pausing current transport "%s"', self.transport.name);
-          self.transport.pause(function() {
+          debug('pausing current transport "%s"', this.transport.name);
+          this.transport.pause(() => {
             if (failed) return;
-            if ("closed" === self.readyState) return;
+            if ("closed" === this.readyState) return;
             debug("changing transport and sending upgrade packet");
 
             cleanup();
 
-            self.setTransport(transport);
+            this.setTransport(transport);
             transport.send([{ type: "upgrade" }]);
-            self.emit("upgrade", transport);
+            this.emit("upgrade", transport);
             transport = null;
-            self.upgrading = false;
-            self.flush();
+            this.upgrading = false;
+            this.flush();
           });
         } else {
           debug('probe transport "%s" failed', name);
           const err = new Error("probe error");
           err.transport = transport.name;
-          self.emit("upgradeError", err);
+          this.emit("upgradeError", err);
         }
       });
-    }
+    };
 
     function freezeTransport() {
       if (failed) return;
@@ -299,7 +285,7 @@ class Socket extends Emitter {
     }
 
     // Handle any error that happens while probing
-    function onerror(err) {
+    const onerror = err => {
       const error = new Error("probe error: " + err);
       error.transport = transport.name;
 
@@ -307,8 +293,8 @@ class Socket extends Emitter {
 
       debug('probe transport "%s" failed because of error: %s', name, err);
 
-      self.emit("upgradeError", error);
-    }
+      this.emit("upgradeError", error);
+    };
 
     function onTransportClose() {
       onerror("transport closed");
@@ -328,13 +314,13 @@ class Socket extends Emitter {
     }
 
     // Remove all listeners on the transport and on self
-    function cleanup() {
+    const cleanup = () => {
       transport.removeListener("open", onTransportOpen);
       transport.removeListener("error", onerror);
       transport.removeListener("close", onTransportClose);
-      self.removeListener("close", onclose);
-      self.removeListener("upgrading", onupgrade);
-    }
+      this.removeListener("close", onclose);
+      this.removeListener("upgrading", onupgrade);
+    };
 
     transport.once("open", onTransportOpen);
     transport.once("error", onerror);
@@ -557,13 +543,29 @@ class Socket extends Emitter {
    * @api private
    */
   close() {
-    const self = this;
+    const close = () => {
+      this.onClose("forced close");
+      debug("socket closing - telling transport to close");
+      this.transport.close();
+    };
+
+    const cleanupAndClose = () => {
+      this.removeListener("upgrade", cleanupAndClose);
+      this.removeListener("upgradeError", cleanupAndClose);
+      close();
+    };
+
+    const waitForUpgrade = () => {
+      // wait for upgrade to finish since we can't send packets while pausing a transport
+      this.once("upgrade", cleanupAndClose);
+      this.once("upgradeError", cleanupAndClose);
+    };
 
     if ("opening" === this.readyState || "open" === this.readyState) {
       this.readyState = "closing";
 
       if (this.writeBuffer.length) {
-        this.once("drain", function() {
+        this.once("drain", () => {
           if (this.upgrading) {
             waitForUpgrade();
           } else {
@@ -577,24 +579,6 @@ class Socket extends Emitter {
       }
     }
 
-    function close() {
-      self.onClose("forced close");
-      debug("socket closing - telling transport to close");
-      self.transport.close();
-    }
-
-    function cleanupAndClose() {
-      self.removeListener("upgrade", cleanupAndClose);
-      self.removeListener("upgradeError", cleanupAndClose);
-      close();
-    }
-
-    function waitForUpgrade() {
-      // wait for upgrade to finish since we can't send packets while pausing a transport
-      self.once("upgrade", cleanupAndClose);
-      self.once("upgradeError", cleanupAndClose);
-    }
-
     return this;
   }
 
@@ -622,7 +606,6 @@ class Socket extends Emitter {
       "closing" === this.readyState
     ) {
       debug('socket close with reason: "%s"', reason);
-      const self = this;
 
       // clear timers
       clearTimeout(this.pingIntervalTimer);
@@ -652,8 +635,8 @@ class Socket extends Emitter {
 
       // clean buffers after, so users can still
       // grab the buffers on `close` event
-      self.writeBuffer = [];
-      self.prevBufferLen = 0;
+      this.writeBuffer = [];
+      this.prevBufferLen = 0;
     }
   }
 
diff --git a/lib/transports/polling-jsonp.js b/lib/transports/polling-jsonp.js
index 3674dfbb8..a739d5458 100644
--- a/lib/transports/polling-jsonp.js
+++ b/lib/transports/polling-jsonp.js
@@ -33,10 +33,7 @@ class JSONPPolling extends Polling {
     this.index = callbacks.length;
 
     // add callback to jsonp global
-    const self = this;
-    callbacks.push(function(msg) {
-      self.onData(msg);
-    });
+    callbacks.push(this.onData.bind(this));
 
     // append to query string
     this.query.j = this.index;
@@ -77,7 +74,6 @@ class JSONPPolling extends Polling {
    * @api private
    */
   doPoll() {
-    const self = this;
     const script = document.createElement("script");
 
     if (this.script) {
@@ -87,8 +83,8 @@ class JSONPPolling extends Polling {
 
     script.async = true;
     script.src = this.uri();
-    script.onerror = function(e) {
-      self.onError("jsonp poll error", e);
+    script.onerror = e => {
+      this.onError("jsonp poll error", e);
     };
 
     const insertAt = document.getElementsByTagName("script")[0];
@@ -119,7 +115,6 @@ class JSONPPolling extends Polling {
    * @api private
    */
   doWrite(data, fn) {
-    const self = this;
     let iframe;
 
     if (!this.form) {
@@ -149,30 +144,30 @@ class JSONPPolling extends Polling {
       fn();
     }
 
-    function initIframe() {
-      if (self.iframe) {
+    const initIframe = () => {
+      if (this.iframe) {
         try {
-          self.form.removeChild(self.iframe);
+          this.form.removeChild(this.iframe);
         } catch (e) {
-          self.onError("jsonp polling iframe removal error", 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="' + self.iframeId + '">';
+        const html = '<iframe src="javascript:0" name="' + this.iframeId + '">';
         iframe = document.createElement(html);
       } catch (e) {
         iframe = document.createElement("iframe");
-        iframe.name = self.iframeId;
+        iframe.name = this.iframeId;
         iframe.src = "javascript:0";
       }
 
-      iframe.id = self.iframeId;
+      iframe.id = this.iframeId;
 
-      self.form.appendChild(iframe);
-      self.iframe = iframe;
-    }
+      this.form.appendChild(iframe);
+      this.iframe = iframe;
+    };
 
     initIframe();
 
@@ -187,7 +182,7 @@ class JSONPPolling extends Polling {
 
     if (this.iframe.attachEvent) {
       this.iframe.onreadystatechange = function() {
-        if (self.iframe.readyState === "complete") {
+        if (this.iframe.readyState === "complete") {
           complete();
         }
       };
diff --git a/lib/transports/polling-xhr.js b/lib/transports/polling-xhr.js
index 40e39cc19..daed40e3d 100755
--- a/lib/transports/polling-xhr.js
+++ b/lib/transports/polling-xhr.js
@@ -74,10 +74,9 @@ class XHR extends Polling {
       method: "POST",
       data: data
     });
-    const self = this;
     req.on("success", fn);
-    req.on("error", function(err) {
-      self.onError("xhr post error", err);
+    req.on("error", err => {
+      this.onError("xhr post error", err);
     });
   }
 
@@ -89,12 +88,9 @@ class XHR extends Polling {
   doPoll() {
     debug("xhr poll");
     const req = this.request();
-    const self = this;
-    req.on("data", function(data) {
-      self.onData(data);
-    });
-    req.on("error", function(err) {
-      self.onError("xhr poll error", err);
+    req.on("data", this.onData.bind(this));
+    req.on("error", err => {
+      this.onError("xhr poll error", err);
     });
     this.pollXhr = req;
   }
@@ -142,7 +138,6 @@ class Request extends Emitter {
     opts.xscheme = !!this.opts.xs;
 
     const xhr = (this.xhr = new XMLHttpRequest(opts));
-    const self = this;
 
     try {
       debug("xhr open %s: %s", this.method, this.uri);
@@ -178,22 +173,22 @@ class Request extends Emitter {
       }
 
       if (this.hasXDR()) {
-        xhr.onload = function() {
-          self.onLoad();
+        xhr.onload = () => {
+          this.onLoad();
         };
-        xhr.onerror = function() {
-          self.onError(xhr.responseText);
+        xhr.onerror = () => {
+          this.onError(xhr.responseText);
         };
       } else {
-        xhr.onreadystatechange = function() {
+        xhr.onreadystatechange = () => {
           if (4 !== xhr.readyState) return;
           if (200 === xhr.status || 1223 === xhr.status) {
-            self.onLoad();
+            this.onLoad();
           } else {
             // make sure the `error` event handler that's user-set
             // does not throw in the same tick and gets caught here
-            setTimeout(function() {
-              self.onError(typeof xhr.status === "number" ? xhr.status : 0);
+            setTimeout(() => {
+              this.onError(typeof xhr.status === "number" ? xhr.status : 0);
             }, 0);
           }
         };
@@ -205,8 +200,8 @@ class Request extends Emitter {
       // 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.
-      setTimeout(function() {
-        self.onError(e);
+      setTimeout(() => {
+        this.onError(e);
       }, 0);
       return;
     }
diff --git a/lib/transports/polling.js b/lib/transports/polling.js
index edf812a12..15061a680 100644
--- a/lib/transports/polling.js
+++ b/lib/transports/polling.js
@@ -30,15 +30,13 @@ class Polling extends Transport {
    * @api private
    */
   pause(onPause) {
-    const self = this;
-
     this.readyState = "pausing";
 
-    function pause() {
+    const pause = () => {
       debug("paused");
-      self.readyState = "paused";
+      this.readyState = "paused";
       onPause();
-    }
+    };
 
     if (this.polling || !this.writable) {
       let total = 0;
@@ -83,22 +81,21 @@ class Polling extends Transport {
    * @api private
    */
   onData(data) {
-    const self = this;
     debug("polling got data %s", data);
-    const callback = function(packet, index, total) {
+    const callback = packet => {
       // if its the first message we consider the transport open
-      if ("opening" === self.readyState && packet.type === "open") {
-        self.onOpen();
+      if ("opening" === this.readyState && packet.type === "open") {
+        this.onOpen();
       }
 
       // if its a close packet, we close the ongoing requests
       if ("close" === packet.type) {
-        self.onClose();
+        this.onClose();
         return false;
       }
 
       // otherwise bypass onData and handle the message
-      self.onPacket(packet);
+      this.onPacket(packet);
     };
 
     // decode payload
@@ -124,12 +121,10 @@ class Polling extends Transport {
    * @api private
    */
   doClose() {
-    const self = this;
-
-    function close() {
+    const close = () => {
       debug("writing close packet");
-      self.write([{ type: "close" }]);
-    }
+      this.write([{ type: "close" }]);
+    };
 
     if ("open" === this.readyState) {
       debug("transport open - closing");
diff --git a/lib/transports/websocket.js b/lib/transports/websocket.js
index 1385597c7..7e5193e64 100644
--- a/lib/transports/websocket.js
+++ b/lib/transports/websocket.js
@@ -119,63 +119,54 @@ class WS extends Transport {
    * @api private
    */
   write(packets) {
-    const self = this;
     this.writable = false;
 
     // encodePacket efficient as it uses WS framing
     // no need for encodePayload
-    let total = packets.length;
-    let i = 0;
-    const l = total;
-    for (; i < l; i++) {
-      (function(packet) {
-        parser.encodePacket(packet, self.supportsBinary, function(data) {
-          // always create a new object (GH-437)
-          const opts = {};
-          if (!usingBrowserWebSocket) {
-            if (packet.options) {
-              opts.compress = packet.options.compress;
-            }
-
-            if (self.opts.perMessageDeflate) {
-              const len =
-                "string" === typeof data
-                  ? Buffer.byteLength(data)
-                  : data.length;
-              if (len < self.opts.perMessageDeflate.threshold) {
-                opts.compress = false;
-              }
-            }
+    for (let i = 0; i < packets.length; i++) {
+      const packet = packets[i];
+      const lastPacket = i === packets.length - 1;
+
+      parser.encodePacket(packet, this.supportsBinary, data => {
+        // always create a new object (GH-437)
+        const opts = {};
+        if (!usingBrowserWebSocket) {
+          if (packet.options) {
+            opts.compress = packet.options.compress;
           }
 
-          // Sometimes the websocket has already been closed but the browser didn't
-          // 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
-              self.ws.send(data);
-            } else {
-              self.ws.send(data, opts);
+          if (this.opts.perMessageDeflate) {
+            const len =
+              "string" === typeof data ? Buffer.byteLength(data) : data.length;
+            if (len < this.opts.perMessageDeflate.threshold) {
+              opts.compress = false;
             }
-          } catch (e) {
-            debug("websocket closed before onclose event");
           }
-
-          --total || done();
-        });
-      })(packets[i]);
-    }
-
-    function done() {
-      self.emit("flush");
-
-      // fake drain
-      // defer to next tick to allow Socket to clear writeBuffer
-      setTimeout(function() {
-        self.writable = true;
-        self.emit("drain");
-      }, 0);
+        }
+
+        // Sometimes the websocket has already been closed but the browser didn't
+        // 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
+            this.ws.send(data);
+          } else {
+            this.ws.send(data, opts);
+          }
+        } catch (e) {
+          debug("websocket closed before onclose event");
+        }
+
+        if (lastPacket) {
+          // fake drain
+          // defer to next tick to allow Socket to clear writeBuffer
+          setTimeout(() => {
+            this.writable = true;
+            this.emit("drain");
+          }, 0);
+        }
+      });
     }
   }
 

From 0acbe5fdedf9c8634b2ceb91893f4f412f09ec01 Mon Sep 17 00:00:00 2001
From: Damien Arrachequesne <damien.arrachequesne@gmail.com>
Date: Tue, 4 May 2021 09:40:44 +0200
Subject: [PATCH 3/3] chore(release): 5.1.0

Diff: https://github.com/socketio/engine.io-client/compare/5.0.1...5.1.0
---
 CHANGELOG.md          |  8 ++++++++
 dist/engine.io.js     | 12 ++++++------
 dist/engine.io.min.js |  4 ++--
 package-lock.json     |  2 +-
 package.json          |  2 +-
 5 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ec7a7063..d25b64a99 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+# [5.1.0](https://github.com/socketio/engine.io-client/compare/5.0.1...5.1.0) (2021-05-04)
+
+
+### Features
+
+* add the "closeOnBeforeunload" option ([dcb85e9](https://github.com/socketio/engine.io-client/commit/dcb85e902d129b2d1a94943b4f6d471532f70dc9))
+
+
 ## [5.0.1](https://github.com/socketio/engine.io-client/compare/5.0.0...5.0.1) (2021-03-31)
 
 
diff --git a/dist/engine.io.js b/dist/engine.io.js
index c01a1c65a..ee342e663 100644
--- a/dist/engine.io.js
+++ b/dist/engine.io.js
@@ -1,5 +1,5 @@
 /*!
- * Engine.IO v5.0.1
+ * Engine.IO v5.1.0
  * (c) 2014-2021 Guillermo Rauch
  * Released under the MIT License.
  */
@@ -130,7 +130,7 @@ eval("var Socket = __webpack_require__(/*! ./socket */ \"./lib/socket.js\");\n\n
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-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    }, 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      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      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 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        var self = this;\n        setTimeout(function () {\n          self.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      debug(\"setting transport %s\", transport.name);\n      var self = this;\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\", function () {\n        self.onDrain();\n      }).on(\"packet\", function (packet) {\n        self.onPacket(packet);\n      }).on(\"error\", function (e) {\n        self.onError(e);\n      }).on(\"close\", function () {\n        self.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      debug('probing transport \"%s\"', name);\n      var transport = this.createTransport(name, {\n        probe: 1\n      });\n      var failed = false;\n      var self = this;\n      Socket.priorWebsocketSuccess = false;\n\n      function onTransportOpen() {\n        if (self.onlyBinaryUpgrades) {\n          var upgradeLosesBinary = !this.supportsBinary && self.transport.supportsBinary;\n          failed = failed || upgradeLosesBinary;\n        }\n\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            self.upgrading = true;\n            self.emit(\"upgrading\", transport);\n            if (!transport) return;\n            Socket.priorWebsocketSuccess = \"websocket\" === transport.name;\n            debug('pausing current transport \"%s\"', self.transport.name);\n            self.transport.pause(function () {\n              if (failed) return;\n              if (\"closed\" === self.readyState) return;\n              debug(\"changing transport and sending upgrade packet\");\n              cleanup();\n              self.setTransport(transport);\n              transport.send([{\n                type: \"upgrade\"\n              }]);\n              self.emit(\"upgrade\", transport);\n              transport = null;\n              self.upgrading = false;\n              self.flush();\n            });\n          } else {\n            debug('probe transport \"%s\" failed', name);\n            var err = new Error(\"probe error\");\n            err.transport = transport.name;\n            self.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      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        self.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      function cleanup() {\n        transport.removeListener(\"open\", onTransportOpen);\n        transport.removeListener(\"error\", onerror);\n        transport.removeListener(\"close\", onTransportClose);\n        self.removeListener(\"close\", onclose);\n        self.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(\"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 _this2 = this;\n\n      clearTimeout(this.pingTimeoutTimer);\n      this.pingTimeoutTimer = setTimeout(function () {\n        _this2.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 self = this;\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 (this.upgrading) {\n              waitForUpgrade();\n            } else {\n              close();\n            }\n          });\n        } else if (this.upgrading) {\n          waitForUpgrade();\n        } else {\n          close();\n        }\n      }\n\n      function close() {\n        self.onClose(\"forced close\");\n        debug(\"socket closing - telling transport to close\");\n        self.transport.close();\n      }\n\n      function cleanupAndClose() {\n        self.removeListener(\"upgrade\", cleanupAndClose);\n        self.removeListener(\"upgradeError\", cleanupAndClose);\n        close();\n      }\n\n      function waitForUpgrade() {\n        // wait for upgrade to finish since we can't send packets while pausing a transport\n        self.once(\"upgrade\", cleanupAndClose);\n        self.once(\"upgradeError\", cleanupAndClose);\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);\n        var self = this; // 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        self.writeBuffer = [];\n        self.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?");
+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(\"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?");
 
 /***/ }),
 
@@ -163,7 +163,7 @@ eval("var XMLHttpRequest = __webpack_require__(/*! ../../contrib/xmlhttprequest-
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-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    var self = _assertThisInitialized(_this);\n\n    callbacks.push(function (msg) {\n      self.onData(msg);\n    }); // 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 self = this;\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        self.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 self = this;\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      function initIframe() {\n        if (self.iframe) {\n          try {\n            self.form.removeChild(self.iframe);\n          } catch (e) {\n            self.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=\"' + self.iframeId + '\">';\n          iframe = document.createElement(html);\n        } catch (e) {\n          iframe = document.createElement(\"iframe\");\n          iframe.name = self.iframeId;\n          iframe.src = \"javascript:0\";\n        }\n\n        iframe.id = self.iframeId;\n        self.form.appendChild(iframe);\n        self.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 (self.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?");
+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 (this.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?");
 
 /***/ }),
 
@@ -174,7 +174,7 @@ eval("function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol ===
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-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 req = this.request({\n        method: \"POST\",\n        data: data\n      });\n      var self = this;\n      req.on(\"success\", fn);\n      req.on(\"error\", function (err) {\n        self.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      debug(\"xhr poll\");\n      var req = this.request();\n      var self = this;\n      req.on(\"data\", function (data) {\n        self.onData(data);\n      });\n      req.on(\"error\", function (err) {\n        self.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 _this2;\n\n    _classCallCheck(this, Request);\n\n    _this2 = _super2.call(this);\n    _this2.opts = opts;\n    _this2.method = opts.method || \"GET\";\n    _this2.uri = uri;\n    _this2.async = false !== opts.async;\n    _this2.data = undefined !== opts.data ? opts.data : null;\n\n    _this2.create();\n\n    return _this2;\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 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      var self = this;\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            self.onLoad();\n          };\n\n          xhr.onerror = function () {\n            self.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              self.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                self.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          self.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?");
+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?");
 
 /***/ }),
 
@@ -185,7 +185,7 @@ eval("function _typeof(obj) { \"@babel/helpers - typeof\"; if (typeof Symbol ===
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-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 self = this;\n      this.readyState = \"pausing\";\n\n      function pause() {\n        debug(\"paused\");\n        self.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 self = this;\n      debug(\"polling got data %s\", data);\n\n      var callback = function callback(packet, index, total) {\n        // if its the first message we consider the transport open\n        if (\"opening\" === self.readyState && packet.type === \"open\") {\n          self.onOpen();\n        } // if its a close packet, we close the ongoing requests\n\n\n        if (\"close\" === packet.type) {\n          self.onClose();\n          return false;\n        } // otherwise bypass onData and handle the message\n\n\n        self.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 self = this;\n\n      function close() {\n        debug(\"writing close packet\");\n        self.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 _this = this;\n\n      this.writable = false;\n      parser.encodePayload(packets, function (data) {\n        _this.doWrite(data, function () {\n          _this.writable = true;\n\n          _this.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?");
+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?");
 
 /***/ }),
 
@@ -207,7 +207,7 @@ eval("var globalThis = __webpack_require__(/*! ../globalThis */ \"./lib/globalTh
 /*! no static exports found */
 /***/ (function(module, exports, __webpack_require__) {
 
-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\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 self = this;\n      this.writable = false; // encodePacket efficient as it uses WS framing\n      // no need for encodePayload\n\n      var total = packets.length;\n      var i = 0;\n      var l = total;\n\n      for (; i < l; i++) {\n        (function (packet) {\n          parser.encodePacket(packet, self.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 (self.opts.perMessageDeflate) {\n                var len = \"string\" === typeof data ? Buffer.byteLength(data) : data.length;\n\n                if (len < self.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                self.ws.send(data);\n              } else {\n                self.ws.send(data, opts);\n              }\n            } catch (e) {\n              debug(\"websocket closed before onclose event\");\n            }\n\n            --total || done();\n          });\n        })(packets[i]);\n      }\n\n      function done() {\n        self.emit(\"flush\"); // fake drain\n        // defer to next tick to allow Socket to clear writeBuffer\n\n        setTimeout(function () {\n          self.writable = true;\n          self.emit(\"drain\");\n        }, 0);\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?");
+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\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            setTimeout(function () {\n              _this3.writable = true;\n\n              _this3.emit(\"drain\");\n            }, 0);\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?");
 
 /***/ }),
 
diff --git a/dist/engine.io.min.js b/dist/engine.io.min.js
index f801f938d..ff6439077 100644
--- a/dist/engine.io.min.js
+++ b/dist/engine.io.min.js
@@ -1,6 +1,6 @@
 /*!
- * Engine.IO v5.0.1
+ * Engine.IO v5.1.0
  * (c) 2014-2021 Guillermo Rauch
  * Released under the MIT License.
  */
-!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):"object"==typeof exports?exports.eio=e():t.eio=e()}(self,(function(){return function(t){var e={};function r(n){if(e[n])return e[n].exports;var o=e[n]={i:n,l:!1,exports:{}};return t[n].call(o.exports,o,o.exports,r),o.l=!0,o.exports}return r.m=t,r.c=e,r.d=function(t,e,n){r.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:n})},r.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},r.t=function(t,e){if(1&e&&(t=r(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var o in t)r.d(n,o,function(e){return t[e]}.bind(null,o));return n},r.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return r.d(e,"a",e),e},r.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},r.p="",r(r.s=11)}([function(t,e,r){var n=r(15),o=r(16),i=String.fromCharCode(30);t.exports={protocol:4,encodePacket:n,encodePayload:function(t,e){var r=t.length,o=new Array(r),s=0;t.forEach((function(t,a){n(t,!1,(function(t){o[a]=t,++s===r&&e(o.join(i))}))}))},decodePacket:o,decodePayload:function(t,e){for(var r=t.split(i),n=[],s=0;s<r.length;s++){var a=o(r[s],e);if(n.push(a),"error"===a.type)break}return n}}},function(t,e){t.exports="undefined"!=typeof self?self:"undefined"!=typeof window?window:Function("return this")()},function(t,e,r){function n(t){return(n="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t})(t)}function o(t,e){for(var r=0;r<e.length;r++){var n=e[r];n.enumerable=n.enumerable||!1,n.configurable=!0,"value"in n&&(n.writable=!0),Object.defineProperty(t,n.key,n)}}function i(t,e){return(i=Object.setPrototypeOf||function(t,e){return t.__proto__=e,t})(t,e)}function s(t){var e=function(){if("undefined"==typeof Reflect||!Reflect.construct)return!1;if(Reflect.construct.sham)return!1;if("function"==typeof Proxy)return!0;try{return Date.prototype.toString.call(Reflect.construct(Date,[],(function(){}))),!0}catch(t){return!1}}();return function(){var r,n=u(t);if(e){var o=u(this).constructor;r=Reflect.construct(n,arguments,o)}else r=n.apply(this,arguments);return a(this,r)}}function a(t,e){return!e||"object"!==n(e)&&"function"!=typeof e?function(t){if(void 0===t)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return t}(t):e}function u(t){return(u=Object.setPrototypeOf?Object.getPrototypeOf:function(t){return t.__proto__||Object.getPrototypeOf(t)})(t)}var 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diff --git a/package-lock.json b/package-lock.json
index 37cb11412..d390460d3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "engine.io-client",
-  "version": "5.0.1",
+  "version": "5.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 4b69771c0..1aea647f5 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "engine.io-client",
   "description": "Client for the realtime Engine",
   "license": "MIT",
-  "version": "5.0.1",
+  "version": "5.1.0",
   "main": "lib/index.js",
   "homepage": "https://github.com/socketio/engine.io-client",
   "contributors": [