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node_modules/engine.io-client/build/esm-debug/transports/xmlhttprequest.browser.js

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+// browser shim for xmlhttprequest module
+import { hasCORS } from "../contrib/has-cors.js";
+import { globalThisShim as globalThis } from "../globalThis.js";
+export function XHR(opts) {
+    const xdomain = opts.xdomain;
+    // XMLHttpRequest can be disabled on IE
+    try {
+        if ("undefined" !== typeof XMLHttpRequest && (!xdomain || hasCORS)) {
+            return new XMLHttpRequest();
+        }
+    }
+    catch (e) { }
+    if (!xdomain) {
+        try {
+            return new globalThis[["Active"].concat("Object").join("X")]("Microsoft.XMLHTTP");
+        }
+        catch (e) { }
+    }
+}