Typescript error with default events using enum

[tannerkrewson]

Describe the bug
I'm using Typescript enums for my socket events. I made my own for connect, disconnect, etc. like this:

export enum SocketEvent {
    CONNECT = "connect",
    DISCONNECT = "disconnect",
    RECONNECT = "reconnect",
}

Not shown, I also have my own SocketEvent enums for my custom events. Those do not have this error.

Those three cause this error:

pages/find.tsx:68:43 - error TS2345: Argument of type '(reason: string) => void' is not assignable to parameter of type 'never'.

68         socket.on(SocketEvent.DISCONNECT, (reason: string) => {
                                             ~~~~~~~~~~~~~~~~~~~~~

utils/useRocketcrabClientSocket.ts:29:40 - error TS2345: Argument of type '() => void' is not assignable to parameter of type 'never'.

29         socket.on(SocketEvent.CONNECT, () => setSocketConnected(true));
                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

utils/useRocketcrabClientSocket.ts:49:43 - error TS2345: Argument of type '(reason: any) => void' is not assignable to parameter of type 'never'.

49         socket.on(SocketEvent.DISCONNECT, (reason) => {
                                             ~~~~~~~~~~~~~

utils/useRocketcrabClientSocket.ts:74:45 - error TS2345: Argument of type '() => void' is not assignable to parameter of type 'never'.

74         socket.io.on(SocketEvent.RECONNECT, () => {

To Reproduce

Use an enum with the string for the default events.

Socket.IO server version: 4.0.1

Expected behavior
A clear and concise description of what you expected to happen.

Platform:
Win 10, Node 14, Typescript 4.2.4

[tannerkrewson]

Is this the same as #3834 ? I'm definetely on 4.0.1 🤔

[darrachequesne]

The fix was not replicated to the client, it is now: socketio/socket.io-client@5394669

Included in [email protected].