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.svelte
<p
transition:fly={{ y: 200, duration: 2000 }}
on:introstart={() => status = 'intro started'}
on:outrostart={() => status = 'outro started'}
on:introend={() => status = 'intro ended'}
on:outroend={() => status = 'outro ended'}
>
Flies in and out
</p>1
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<script>
import { fly } from 'svelte/transition';let visible = true;
let status = '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}