socket.id can be undefined according to the docs, but cannot according to the type

[KleaTech]

Describe the bug
socket.id can be undefined according to the documentation (until connect event is triggered). But the Socket type does not mark it as possibly undefined.

To Reproduce
Check the documentation:

Check the code:

socket.io/lib/socket.ts

Line 192 in 8c9ebc3

public readonly id: SocketId;

And:
https://github.com/socketio/socket.io-adapter/blob/28f60b880ad04ff4b48ade0cd529f1970643604f/lib/index.ts#L10

Socket.IO client version: 4.7.2

Expected behavior
Either the Socket or SocketId type should allow undefined values or the documentation should be clarified.

[darrachequesne]

The id attribute on the client side is now typed as string | undefined: socketio/socket.io-client@f9c16f2

On the server side, it cannot be undefined:

socket.io/lib/socket.ts

Line 192 in 6ab2509

public readonly id: SocketId;

Thanks for the heads-up! 👍