Socket.io-client 4.8.0 with Node native WebSocket 'Maximum call stack size exceeded' exception when closing the connection

[vpmedia]

Describe the bug
Using socket.io 4.8.0 server and socket.io-client 4.8.0 with native Node v21+ web socket transport I'm getting the following exception when the connection is closed between the client and the server.
The WebSocket client is running server side using the new transport WebSocket option added in v4.8.0.

process.on('uncaughtException') log:
(this is unexpected)

error: [Server] uncaughtException Maximum call stack size exceeded {"stack":"RangeError: Maximum call stack size exceeded\n    at emitInitScript (node:internal/async_hooks:495:24)\n    at process.nextTick (node:internal/process/task_queues:143:5)\n    at emitUncaughtException (node:internal/event_target:1090:11)\n    at [nodejs.internal.kHybridDispatch] (node:internal/event_target:824:9)\n    at WebSocket.dispatchEvent (node:internal/event_target:751:26)\n    at fireEvent (node:internal/deps/undici/undici:11340:14)\n    at failWebsocketConnection (node:internal/deps/undici/undici:11421:9)\n    at closeWebSocketConnection (node:internal/deps/undici/undici:11692:9)\n    at WebSocket.close (node:internal/deps/undici/undici:12352:9)\n    at WS.doClose (file:///REDACTED/node_modules/engine.io-client/build/esm-debug/transports/websocket.js:83:21)"}

socket.on('connect_error') log:
(this is expected)

error: [Entity] onConnectError websocket error {"description":{},"stack":"Error: websocket error\n    at WS.onError (file:///REDACTED/node_modules/engine.io-client/build/esm-debug/transport.js:41:37)\n    at ws.onerror (file:///REDACTED/node_modules/engine.io-client/build/esm-debug/transports/websocket.js:51:39)\n    at [nodejs.internal.kHybridDispatch] (node:internal/event_target:816:20)\n    at WebSocket.dispatchEvent (node:internal/event_target:751:26)\n    at fireEvent (node:internal/deps/undici/undici:11340:14)\n    at failWebsocketConnection (node:internal/deps/undici/undici:11421:9)\n    at Object.processResponse (node:internal/deps/undici/undici:11635:13)\n    at node:internal/deps/undici/undici:10425:23\n    at node:internal/process/task_queues:151:7\n    at AsyncResource.runInAsyncScope (node:async_hooks:211:14)","type":"TransportError"}

[vpmedia]

I've created a repository with a minimal example to reproduce the issue:
https://github.com/vpmedia/socketio-issue

my node version is v22.9.0
my system is macOS 15.0 / Apple M3 Max

[darrachequesne]

I could indeed reproduce the issue, thanks for the example 👍

This should be fixed by 4865f2e, included in engine.io-client@6.6.2. Could you please check?

[vpmedia]

I'm on leave at the moment but I'll test it after next week.
Thanks for the feedback!