const Writer = msgpacklib.writer;
const Reader = msgpacklib.reader;

receive packets:

onmessage = function (e) {
let data = e.data;
let packet = new Reader(data);
let [packetID, info] = packet.readData();
}

send packets:

 function send(packetID, ...args) {
let binData = new Writer(1, args).setString(packetID).setInt(144 + args.length, !0);
args && args.forEach(e => {
switch (typeof e) {
case 'number':
Number.isSafeInteger(e) ? binData.setInt(e) : binData.setFloat(e);
break;
case 'string':
binData.setString(e);
}
});
let packet = binData.arraybuffer;
socket.send(packet);
return packet;
}

made for moomoo.io so idk if u wanna use it in other stuff