make-mutation-observer

Simple wrapper around `MutationObserver` API to watch DOM changes.

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyforks.org/scripts/488160/1335044/make-mutation-observer.js

// ==UserScript==
// @name         make-mutation-observer
// @description  Simple wrapper around `MutationObserver` API to watch DOM changes.
// @version      0.1.0
// @namespace    owowed.moe
// @author       owowed <[email protected]>
// @license      LGPL-3.0
// ==/UserScript==

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

/**
 * @typedef MakeMutationObserverOptionsBasic
 * @prop {HTMLElement} target
 * @prop {MakeMutationObserverCallback} callback
 * @prop {AbortSignal} [abortSignal]
 * @prop {boolean} [once]
 */

/** @typedef {MakeMutationObserverOptionsBasic & MutationObserverInit} MakeMutationObserverOptions */

/**
 * Create a new `MutationObserver` from target and callback.
 * @param {Node} target target node
 * @param {MakeMutationObserverCallback} callback observer callback
 * @param {MakeMutationObserverOptions} options additional observer options
 * @returns {MutationObserver}
 */
function makeMutationObserver(target, callback, options) {
    return makeMutationObserverOptions({ target, ...options }, callback);
}

/**
 * Create a new `MutationObserver` with options and callback.
 * @param {MakeMutationObserverOptions} options 
 * @param {MakeMutationObserverCallback} callback 
 * @returns {MutationObserver}
 */
function makeMutationObserverOptions({ 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;
}
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