Tampermonkey script to hide the GitHub notification dot

hide-github-notification-dot.js

// ==UserScript==
// @name         Hide GitHub Notification Dot
// @namespace    https://github.com/henrik242
// @version      1.2
// @description  Hides the phantom unread notification indicator dot on GitHub when indicatorMode is "none"
// @match        https://github.com/*
// @match        https://gist.github.com/*
// @grant        GM_addStyle
// @run-at       document-end
// ==/UserScript==

(function () {
    'use strict';

    function hideNewHeader() {
        // New React-based header (github.com)
        const partial = document.querySelector('react-partial[partial-name="global-nav-bar"] script[data-target="react-partial.embeddedData"]');
        if (!partial) return false;

        try {
            const data = JSON.parse(partial.textContent);
            if (data.props.notifications.indicatorMode === 'none') {
                GM_addStyle(`
                    a[class*="notificationIndicator"]::after,
                    a[class*="notificationIndicator"]::before {
                        display: none !important;
                    }
                `);
            }
        } catch (e) {
            // JSON parse failed
        }
        return true;
    }

    function hideOldHeader() {
        // Old header (gist.github.com)
        const indicator = document.querySelector('notification-indicator');
        if (!indicator) return false;

        GM_addStyle(`
            .mail-status.unread {
                display: none !important;
            }
        `);
        return true;
    }

    hideNewHeader() || hideOldHeader();
})();