fix: don't throw with nullish actions (#13559)

Co-authored-by: Oscar Dominguez <[email protected]>

Author: paoloricciuti

.changeset/afraid-worms-clean.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: don't throw with nullish actions

packages/svelte/src/compiler/phases/3-transform/client/visitors/UseDirective.js

@@ -20,7 +20,10 @@ export function UseDirective(node, context) {
 		context.state.node,
 		b.arrow(
 			params,
-			b.call(/** @type {Expression} */ (context.visit(parse_directive_name(node.name))), ...params)
+			b.maybe_call(
+				/** @type {Expression} */ (context.visit(parse_directive_name(node.name))),
+				...params
+			)
 		)
 	];
 

packages/svelte/tests/runtime-runes/samples/nullish-actions/_config.js

@@ -0,0 +1,5 @@
+import { test } from '../../test';
+
+export default test({
+	html: '<div></div> <div></div>'
+});

packages/svelte/tests/runtime-runes/samples/nullish-actions/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	let { action_prop } = $props();
+	let action = $state();
+</script>
+
+<div use:action></div>
+<div use:action_prop></div>