Instead of the transition directive, an element can have an in or an out directive, or both together. Import fade alongside fly...
App
import { fade, fly } from 'svelte/transition';...then replace the transition directive with separate in and out directives:
App
<p in:fly={{ y: 200, duration: 2000 }} out:fade>
Flies in, fades out
</p>In this case, the transitions are not reversed.
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<script>
import { fly } from 'svelte/transition';let visible = $state(true);
</script>
<label>
<input type="checkbox" bind:checked={visible} />visible
</label>
{#if visible} <p transition:fly={{ y: 200, duration: 2000 }}>Flies in and out
</p>
{/if}