<script> import { onMount } from 'svelte'; let a = 1, b = 2, c = 3; onMount(() => { const interval = setInterval(() => { b += 1; c += 1; console.log(b, c); }, 1000); return () => clearInterval(interval); }); $: x = a * 2; $: y = b * 2; </script> <p>{y}</p>