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It can be useful to know when transitions are beginning and ending. Svelte dispatches events that you can listen to like any other DOM event:

App
<p
	transition:fly={{ y: 200, duration: 2000 }}
	onintrostart={() => status = 'intro started'}
	onoutrostart={() => status = 'outro started'}
	onintroend={() => status = 'intro ended'}
	onoutroend={() => status = 'outro ended'}
>
	Flies in and out
</p>

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<script>
	import { fly } from 'svelte/transition';
 
	let visible = $state(true);
	let status = $state('waiting...');
</script>
 
<p>status: {status}</p>
 
<label>
	<input type="checkbox" bind:checked={visible} />
	visible
</label>
 
{#if visible}
	<p
		transition:fly={{ y: 200, duration: 2000 }}
	>
		Flies in and out
	</p>
{/if}