Correctly type event handler in Typescript for a react hook

Question

I am doing a socket.io implementation in typescript.

I have the following event map:

type User {
 id: string
 name: string
}

interface EventsMap {
 'user:created': UserEvent<User>
 'user:deleted': UserEvent<string>
}

const socket: Socket<EventsMap, DefaultEventsMap> = io('http://example.com')

And the hook I wish to create looks like this:

export function useSocketEvent(
  eventName: keyof EventsMap,
  handler: any,
) {
  ...
  useEffect(() => {

    socket.on(eventName, handler)

    return () => {
      socket.off(eventName, handler)
    }
  }, [eventName, handler])
}

I am not sure what is the correct way to type the handlerin the hook so that that type would be correctly linked to the first arg of the hook - the eventName.