From 9348259879776515282562fd5a11c4f04970c7ab Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Tue, 21 Jan 2025 20:24:33 -0500
Subject: [PATCH] WIP

---
 .../samples/async-derived/Child.svelte        |  7 +++++
 .../samples/async-derived/_config.js          | 28 +++++++++++++++++++
 .../samples/async-derived/main.svelte         | 13 +++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-derived/Child.svelte
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-derived/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/async-derived/main.svelte

diff --git a/packages/svelte/tests/runtime-runes/samples/async-derived/Child.svelte b/packages/svelte/tests/runtime-runes/samples/async-derived/Child.svelte
new file mode 100644
index 0000000000..888d2a4e99
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-derived/Child.svelte
@@ -0,0 +1,7 @@
+<script>
+	let { promise, num } = $props();
+
+	let value = $derived((await promise) * num);
+</script>
+
+<p>{value}</p>
diff --git a/packages/svelte/tests/runtime-runes/samples/async-derived/_config.js b/packages/svelte/tests/runtime-runes/samples/async-derived/_config.js
new file mode 100644
index 0000000000..7fe48491f7
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-derived/_config.js
@@ -0,0 +1,28 @@
+import { tick } from 'svelte';
+import { deferred } from '../../../../src/internal/shared/utils.js';
+import { test } from '../../test';
+
+/** @type {ReturnType<typeof deferred>} */
+let d;
+
+export default test({
+	html: `<p>pending</p>`,
+
+	get props() {
+		d = deferred();
+
+		return {
+			promise: d.promise,
+			num: 1
+		};
+	},
+
+	async test({ assert, target }) {
+		d.resolve('hello');
+		await Promise.resolve();
+		await Promise.resolve();
+		await Promise.resolve();
+		await tick();
+		assert.htmlEqual(target.innerHTML, '<p>42</p>');
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/async-derived/main.svelte b/packages/svelte/tests/runtime-runes/samples/async-derived/main.svelte
new file mode 100644
index 0000000000..3b56c3a316
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/async-derived/main.svelte
@@ -0,0 +1,13 @@
+<script>
+	import Child from './Child.svelte';
+
+	let { promise, num } = $props();
+</script>
+
+<svelte:boundary>
+	<Child {promise} {num} />
+
+	{#snippet pending()}
+		<p>pending</p>
+	{/snippet}
+</svelte:boundary>