<script> export let visible; function foo(node, params) { return { delay: 50, duration: 100, tick: t => { node.foo = t; } }; } function bar(node, params) { return { delay: 50, duration: 100, tick: t => { node.bar = t; } }; } </script> {#if visible} <div in:foo out:bar>delayed</div> {/if}