From cb1ea1f2dbfedde5db4468e6f79abcde2dc83438 Mon Sep 17 00:00:00 2001
From: Simon H <5968653+dummdidumm@users.noreply.github.com>
Date: Thu, 30 Nov 2023 11:15:38 +0100
Subject: [PATCH] fix: ensure `$$slots` exists in runes mode (#9718)

fixes #9683
---
 .changeset/flat-melons-protect.md                          | 5 +++++
 packages/svelte/src/compiler/phases/2-analyze/index.js     | 5 +++++
 .../svelte/tests/runtime-runes/samples/slot/_config.js     | 6 ++++++
 .../svelte/tests/runtime-runes/samples/slot/main.svelte    | 7 +++++++
 .../svelte/tests/runtime-runes/samples/slot/slot.svelte    | 3 +++
 5 files changed, 26 insertions(+)
 create mode 100644 .changeset/flat-melons-protect.md
 create mode 100644 packages/svelte/tests/runtime-runes/samples/slot/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/slot/main.svelte
 create mode 100644 packages/svelte/tests/runtime-runes/samples/slot/slot.svelte

diff --git a/.changeset/flat-melons-protect.md b/.changeset/flat-melons-protect.md
new file mode 100644
index 0000000000..43a8c45754
--- /dev/null
+++ b/.changeset/flat-melons-protect.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: ensure `$$slots` exists in runes mode
diff --git a/packages/svelte/src/compiler/phases/2-analyze/index.js b/packages/svelte/src/compiler/phases/2-analyze/index.js
index ef5d807bb9..71295b7059 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/index.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/index.js
@@ -892,6 +892,11 @@ const common_visitors = {
 		const parent = /** @type {import('estree').Node} */ (context.path.at(-1));
 		if (!is_reference(node, parent)) return;
 
+		if (node.name === '$$slots') {
+			context.state.analysis.uses_slots = true;
+			return;
+		}
+
 		const binding = context.state.scope.get(node.name);
 
 		// if no binding, means some global variable
diff --git a/packages/svelte/tests/runtime-runes/samples/slot/_config.js b/packages/svelte/tests/runtime-runes/samples/slot/_config.js
new file mode 100644
index 0000000000..c69314e244
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/slot/_config.js
@@ -0,0 +1,6 @@
+import { test } from '../../test';
+
+// Test that $$slots exists in runes mode
+export default test({
+	html: `<p>bar</p>`
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/slot/main.svelte b/packages/svelte/tests/runtime-runes/samples/slot/main.svelte
new file mode 100644
index 0000000000..e6490ab098
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/slot/main.svelte
@@ -0,0 +1,7 @@
+<script>
+	import Slot from './slot.svelte';
+</script>
+
+<Slot>
+	<p>bar</p>
+</Slot>
diff --git a/packages/svelte/tests/runtime-runes/samples/slot/slot.svelte b/packages/svelte/tests/runtime-runes/samples/slot/slot.svelte
new file mode 100644
index 0000000000..f58504ca4b
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/slot/slot.svelte
@@ -0,0 +1,3 @@
+{#if $$slots}
+	<slot></slot>
+{/if}