Log WebSocket calls

ws.js

((prototype, CONNECTING, OPEN, CLOSING, CLOSED) => {
    WebSocket = function() {
        const ws = new prototype.constructor(...arguments);
        console.trace("new WebSocket", arguments, "=>", ws);
        ws.addEventListener("message", event => console.log(event.data));
        return ws;
    };
    WebSocket.prototype = prototype;
    WebSocket.CONNECTING = CONNECTING;
    WebSocket.OPEN = OPEN;
    WebSocket.CLOSING = CLOSING;
    WebSocket.CLOSED = CLOSED;
})(WebSocket.prototype, WebSocket.CONNECTING, WebSocket.OPEN, WebSocket.CLOSING, WebSocket.CLOSED);