test

packages/svelte/tests/runtime-runes/samples/async-time-travelling-derived/_config.js

@@ -0,0 +1,56 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ assert, target }) {
+		await tick();
+
+		const [a, b, update] = target.querySelectorAll('button');
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<button>a</button>
+				<button>b</button>
+				<button>0</button>
+				<h1>a</h1>
+			`
+		);
+
+		b.click();
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<button>a</button>
+				<button>b</button>
+				<button>0</button>
+				<h1>b</h1>
+			`
+		);
+
+		update.click();
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<button>a</button>
+				<button>b</button>
+				<button>1</button>
+				<h1>b</h1>
+			`
+		);
+
+		a.click();
+		await tick();
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<button>a</button>
+				<button>b</button>
+				<button>1</button>
+				<h1>a</h1>
+			`
+		);
+	}
+});

packages/svelte/tests/runtime-runes/samples/async-time-travelling-derived/main.svelte

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+<script>
+	let object = $state(null);
+	let count = $state(0);
+
+	const condition = $derived(object === null);
+</script>
+
+<svelte:boundary>
+	<button onclick={() => (object = null)}>a</button>
+	<button onclick={() => (object = {})}>b</button>
+
+	<button onclick={async () => {
+		count++;
+		await Promise.resolve();
+		object = {};
+	}}>{await count}</button>
+
+	{#if condition}
+		<h1>a</h1>
+	{:else}
+		<h1>b</h1>
+	{/if}
+
+	{#snippet pending()}{/snippet}
+</svelte:boundary>
+