Incorrect Types for Client Initialisation

[piet-maier]

Description

Initialising the socket.io client with an URL string or undefined depending on the environment (as in the Vue Example in the documentation) produces the following type error: "No overload matches this call."

It is possible to either pass a string or undefined in separate calls, but not a value that has the type string | undefined in one call.

Reproduction

Client Version: 4.7.2

import { io } from "socket.io-client";

const socket = io(import.meta.env.PROD ? undefined : "ws://localhost:3000/");

Expected Behaviour

There should not be a type error since the argument can be of either type, and the code works as expected.

[darrachequesne]

I could indeed reproduce the issue, I'm digging into this.