ChessCom Variants: Private arrows

Prevent your arrows from being shared with spectators
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// ==UserScript==
// @name         ChessCom Variants: Private arrows
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Prevent your arrows from being shared with spectators
// @author       CzEclipsia discord@cz_eclipsia
// @match        *://*.chess.com/variants*
// @icon         https://www.chess.com/favicon.ico
// @grant        none
// @run-at       document-start
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    const TARGET = "wss://variants.gcp-prod.chess.com";
    const windowWebSocket = window.WebSocket;

    window.WebSocket.prototype.sendMessage = function(json) {
        const data = JSON.stringify(json);
        const event = new MessageEvent('message', {data});
        this.dispatchEvent(event);
    };

    window.WebSocket = function (url, protocols) {
        const ws = protocols
            ? new windowWebSocket(url, protocols)
            : new windowWebSocket(url);

        if (typeof url === "string" && url.startsWith(TARGET)) {
            const wsSend = ws.send;
            ws.send = function(data) {
                try {
                    const json = JSON.parse(data);
                    if (json.action == "game" && json.data.action == "draw-arrow") {
                        return ws.sendMessage({
                            mutation: "new_arrow",
                            data: json.data
                        });
                    }
                } catch {}

                wsSend.call(ws, data);
            };
        }

        return ws;
    };

    window.WebSocket.prototype = windowWebSocket.prototype;
})();