svelte/site/content/examples/20-miscellaneous/02-immutable-data/MutableTodo.svelte

<script>
	import { afterUpdate } from 'svelte';
	import flash from './flash.js';

	export let todo;
	let span;

	flash(() => span);
</script>

<!-- the text will flash red whenever
     the `todo` object changes -->
<span bind:this={span}>{todo.text}</span>