[pkg] Update engine.io-client to version 6.2.1

package.json

@@ -79,7 +79,7 @@
     "ejson": "~2.2.0",
     "emits": "~3.0.0",
     "engine.io": "~6.2.0",
-    "engine.io-client": "~5.1.1",
+    "engine.io-client": "~6.2.1",
     "faye-websocket": "~0.11.0",
     "inherits": "~2.0.3",
     "mocha": "~9.0.3",

transformers/engine.io/client.js

@@ -22,8 +22,13 @@ module.exports = function client() {
   var factory = (function factory() {
     if ('undefined' !== typeof eio) return eio;
 
-    try { return Primus.requires('engine.io-client'); }
-    catch (e) {}
+    try {
+      var Socket = Primus.requires('engine.io-client').Socket;
+
+      return function eio(options) {
+        return new Socket(options);
+      }
+    } catch (e) {}
 
     return undefined;
   })();
@@ -55,15 +60,6 @@ module.exports = function client() {
       //
       forceBase64: true,
 
-      //
-      // XDR has been the source of pain for most real-time users. It doesn't
-      // support the full CORS spec and is infested with bugs. It cannot connect
-      // cross-scheme, does not send ANY authorization information like Cookies,
-      // Basic Authorization headers etc. Force this off by default to ensure a
-      // stable connection.
-      //
-      enablesXDR: false,
-
       //
       // Force timestamps on every single connection. Engine.IO only does this
       // for polling by default, but WebSockets require an explicit `true`
@@ -76,14 +72,6 @@ module.exports = function client() {
         : ['polling']
     }));
 
-    //
-    // Nuke a growing memory leak as Engine.IO pushes instances in to an exposed
-    // `sockets` array.
-    //
-    if (factory.sockets && factory.sockets.length) {
-      factory.sockets.length = 0;
-    }
-
     //
     // Setup the Event handlers.
     //