Node.js ws server: global or local functions? [closed]

I'm working on a Node.js chat app project using the ws library. I have it up and running but I'm still making improvements and adding stuff like authentication, etc. Before I get too far, I am wondering what the best functional approach to handling messages (and other events) is. For example, right now I have the following code to handle a message from the client (I cut out most of it, just keeping in one function to use as an example):

wss.on('connection', (ws, req) => {
    // Give them the funtions (uses local ws)
    function handleMessage(msgJSON) {
        let incMsg = {};
        try {
            incMsg = JSON.parse(msgJSON); // message from client
        } catch {
            console.error("Could not parse sent JSON");
            return;
        }
        switch (incMsg.type) {
            case "message":
                 ws.send("Message sent.");
                 // send the message to other clients:
                 wss.clients.forEach(client => {
                      // send message to all open clients but not this client
                      if (client !== ws && client.readyState === WebSocket.OPEN) {
                           client.send(`${client.username}: ${incMsg.message}`);
                      }
                 }
            // some more cases, like for "meta"
        }
    }

    // more functions ...

    ws.on('message', message => {
        handleMessage(message);
    });
}

This strategy takes advantage of having the ws variable inside the inner function, but this makes the wss.on('connection') handler full of a lot of functions. Is it better practice to use this approach or to make a global sort of function that you then pass the client into? My alternate idea looks like this:

function handleMessage(msgJSON, ws) { // accepts the current client
    let incMsg = {};
    try {
        incMsg = JSON.parse(msgJSON); // message from client
    } catch {
        console.error("Could not parse sent JSON");
        return;
    }
    switch (incMsg.type) {
        case "message":
             ws.send("Message sent.");
             // send the message to other clients:
             wss.clients.forEach(client => {
                  // send message to all open clients but not this client
                  if (client !== ws && client.readyState === WebSocket.OPEN) {
                       client.send(`${client.username}: ${incMsg.message}`);
                  }
             }
             break;
        // some more cases, like for "meta" ...
    }
}

// more functions ...

wss.on('connection', (ws, req) => {
    ws.on('message', message => {
        handleMessage(message, ws); // pass along the ws client
    });
}
```