svelte/documentation/tutorial/12-actions/02-adding-parameters-to-actions/app-a/App.svelte

<script>
	import { longpress } from './longpress.js';

	let pressed = false;
	let duration = 2000;
</script>

<label>
	<input type="range" bind:value={duration} max={2000} step={100} />
	{duration}ms
</label>

<button use:longpress on:longpress={() => (pressed = true)} on:mouseenter={() => (pressed = false)}
	>press and hold</button
>

{#if pressed}
	<p>congratulations, you pressed and held for {duration}ms</p>
{/if}