fix(eio): restore compatibility with Node.js 10

`Object.fromEntries()` was added in [1] (engine.io@6.6.5, Dec 2025).

[1]: e08293b

Related: #5527

Author: darrachequesne

packages/engine.io/lib/server.ts

@@ -21,6 +21,7 @@ import { WebTransport } from "./transports/webtransport";
 import { createPacketDecoderStream } from "engine.io-parser";
 import type { EngineRequest, Transport } from "./transport";
 import type { CookieSerializeOptions } from "./contrib/types.cookie";
+import { objectFromEntries } from "./utils/objectFromEntries";
 
 const debug = debugModule("engine");
 
@@ -763,7 +764,7 @@ export class Server extends BaseServer {
     // try to leverage pre-existing `req._query` (e.g: from connect)
     if (!req._query) {
       const url = new URL(req.url, "https://socket.io");
-      req._query = Object.fromEntries(url.searchParams.entries());
+      req._query = objectFromEntries(url.searchParams.entries());
     }
   }
 

packages/engine.io/lib/utils/objectFromEntries.ts

@@ -0,0 +1,15 @@
+// polyfill for Node.js < 12
+// reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries
+export const objectFromEntries =
+  Object.fromEntries ||
+  function fromEntries<T = unknown>(
+    entries: Iterable<readonly [PropertyKey, T]>,
+  ): Record<PropertyKey, T> {
+    const obj: Record<PropertyKey, T> = {};
+
+    for (const [key, value] of entries) {
+      obj[key] = value;
+    }
+
+    return obj;
+  };