misskey-nya2na.user.js

// ==UserScript==
// @name         misskey-nya2na
// @namespace    misskey-nya2na
// @version      0.1
// @description  replace misskey notes にゃ to ruby-ed な(にゃ)
// @author       hogashi
// @match        https://misskey.io/
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const onLoad = () => {
        const targetNode = document.querySelector('[data-sticky-container-header-height] div:has(> div > article)');
        const onMutate = () => {
            targetNode.querySelectorAll('article span:not(:has(.nya2na))').forEach(span => {
                span.innerHTML = span.innerHTML.replace(/にゃ/g, '<ruby class="nya2na">な<rp>(</rp><rt>にゃ</rt><rp>)</rp></ruby>');
            });
        };
        const observer = new MutationObserver(onMutate);

        // Start observing the target node for configured mutations
        observer.observe(targetNode, { childList: true });
        onMutate();
    };

    window.addEventListener('load', () => {
        console.log('nya2na: window loaded');
        setTimeout(() => {
            console.log('nya2na: onLoad');
            onLoad();
        }, 5000);
    });
})();