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Mutation Observer

A simple wrapper around MutationObserver API to watch DOM changes.

Fra og med 24.02.2024. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://update.greatest.deepsurf.us/scripts/488160/1332701/Mutation%20Observer.js 

// ==UserScript==
// @name         Mutation Observer
// @description  A simple wrapper around MutationObserver API to watch DOM changes.
// @version      1.0.2
// @namespace    owowed.moe
// @author       owowed <[email protected]>
// @license      LGPL-3.0
// ==/UserScript==

/**
 * @typedef {MutationObserverInit & {
 *  target: HTMLElement,
 *  abortSignal?: AbortSignal,
 *  once?: boolean
 * }} MakeMutationObserverOptions
 */

/**
 * @typedef {(info: { records: MutationRecord[], observer: MutationObserver }) => void} MakeMutationObserverCallback
 */

/**
 * Create a new `MutationObserver` with options and callback.
 * @param {MakeMutationObserverOptions} options 
 * @param {MakeMutationObserverCallback} callback 
 * @returns {MutationObserver}
 */
function makeMutationObserver({ target, abortSignal, once, ...options }, callback) {
    const observer = new MutationObserver(records => {
        abortSignal?.throwIfAborted();
        if (once) observer.disconnect();
        callback({ records, observer });
    });

    observer.observe(target, options);

    abortSignal?.addEventListener("abort", () => {
        observer.disconnect();
    });

    return observer;
}