Mastodon HackFix hashtags

hashtags.user.js

// ==UserScript==
// @name         Fix Mastodon Hashtags
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Fix the hashtag issue in mastodon
// @author       thypon@mastodon.social
// @match        https://*/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Enable only if you are in a mastodon server
    if (document.querySelector('body > #mastodon')) {

        // https://stackoverflow.com/questions/6195729/most-efficient-way-to-prepend-a-value-to-an-array
        function prepend(value, array) {
            var newArray = array.slice();
            newArray.unshift(value);
            return newArray;
        }

        // https://stackoverflow.com/questions/18310484/modify-http-responses-from-a-chrome-extension
        var _open = XMLHttpRequest.prototype.open;
        window.XMLHttpRequest.prototype.open = function (method, URL) {
            var _onreadystatechange = this.onreadystatechange,
                _this = this;

            _this.onreadystatechange = function () {
                // catch only completed 'api/search/universal' requests
                let params = new URLSearchParams(URL.split('?')[1]);
                if (_this.readyState === 4
                    && _this.status === 200
                    && ~URL.indexOf('api/v2/search')
                    && params.get('q')) {
                    try {
                        var data = JSON.parse(_this.responseText);
                        let nohashes = params.get('q').replaceAll('#', '')

                        if (data.hashtags) {
                            let dumbHashtag = {"name": nohashes,"url":`https://mastodon.social/tags/${nohashes}`,"history":[],"following":false}
                            data.hashtags = prepend(
                                dumbHashtag,
                                data.hashtags);
                        }

                        // rewrite responseText
                        Object.defineProperty(_this, 'responseText', {value: JSON.stringify(data)});
                        /////////////// END //////////////////
                    } catch (e) {}

                    console.log('Caught! :)', method, URL/*, _this.responseText*/);
                }
                // call original callback
                if (_onreadystatechange) _onreadystatechange.apply(this, arguments);
            };

            // detect any onreadystatechange changing
            Object.defineProperty(this, "onreadystatechange", {
                get: function () {
                    return _onreadystatechange;
                },
                set: function (value) {
                    _onreadystatechange = value;
                }
            });

            return _open.apply(_this, arguments);
        };
    }
})();

Unfortunately this also breaks the autocomplete suggestions when typing hashtags in the New Post dialog. I added an additional check at Line 34 to exclude these lookups that seems to have resolved it:

if (_this.readyState === 4 && _this.status === 200 && ~URL.indexOf('api/v2/search') && params.get('q') && !params.get('type')) {

Updated to include the fix