eewing
39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
import { extract } from "../extract/extract.svelte.js";
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import { defaultWindow } from "../../internal/configurable-globals.js";
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/**
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* Watch for changes being made to the DOM tree.
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*
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* @see https://runed.dev/docs/utilities/useMutationObserver
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* @see https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver MutationObserver MDN
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*/
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export function useMutationObserver(target, callback, options = {}) {
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const { window = defaultWindow } = options;
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let observer;
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const targets = $derived.by(() => {
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const value = extract(target);
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return new Set(value ? (Array.isArray(value) ? value : [value]) : []);
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});
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const stop = $effect.root(() => {
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$effect(() => {
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if (!targets.size || !window)
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return;
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observer = new window.MutationObserver(callback);
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for (const el of targets)
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observer.observe(el, options);
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return () => {
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observer?.disconnect();
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observer = undefined;
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};
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});
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});
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$effect(() => {
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return stop;
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});
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return {
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stop,
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takeRecords() {
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return observer?.takeRecords();
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},
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};
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}
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