µsocket.js

import { Socket } from 'net';
import * as struct from 'bufferpack';

let sock = new Socket({ readable: true, writable: true });
sock.connect({
  host: 'oldschool1.runescape.com',
  port: 43594
}, () => {
  // first we bind a listener to all incoming data
  sock.on('data', (buff) => {
    let versionPacket = buff.readInt8(0);
    let verisionIsCurrent = (versionPacket !== OP_OUTDATED);
    // ^ is a boolean, do what ever you want with it now;
  });

  // then we send our data
  sock.write(struct.pack('>bi', [15, revision]));
});