fix: allow slots to have no arguments (#3376)

Co-authored-by: Johnson Chu <johnsoncodehk@gmail.com>

packages/vue-language-core/src/generators/template.ts

@@ -1596,14 +1596,15 @@ export function generate(
 
 		if (hasScriptSetupSlots) {
 			codes.push(
+				'__VLS_normalizeSlot(',
 				['', 'template', node.loc.start.offset, capabilitiesPresets.diagnosticOnly],
 				'__VLS_slots[',
 				['', 'template', node.loc.start.offset, capabilitiesPresets.diagnosticOnly],
 				slotNameExpNode?.content ?? `('${getSlotName()}' as const)`,
 				['', 'template', node.loc.end.offset, capabilitiesPresets.diagnosticOnly],
 				']',
 				['', 'template', node.loc.end.offset, capabilitiesPresets.diagnosticOnly],
-				'?.(',
+				')?.(',
 				['', 'template', startTagOffset, capabilitiesPresets.diagnosticOnly],
 				'{\n',
 			);

packages/vue-language-core/src/utils/globalTypes.ts

@@ -111,6 +111,7 @@ declare function __VLS_pickFunctionalComponentCtx<T, K>(comp: T, compInstance: K
 >;
 type __VLS_AsFunctionOrAny<F> = unknown extends F ? any : ((...args: any) => any) extends F ? F : any;
 
+declare function __VLS_normalizeSlot<S>(s: S): S extends () => infer R ? (props: {}) => R : S;
 declare function __VLS_componentProps<T, K>(comp: T, fnReturn: K):
 	__VLS_PickNotAny<K, {}> extends { __ctx: { props: infer P } } ? NonNullable<P>
 	: T extends (props: infer P, ...args: any) => any ? NonNullable<P> :

packages/vue-test-workspace/vue-tsc/non-strict-template/#3371/main.vue

@@ -0,0 +1,11 @@
+<script setup lang="ts">
+defineSlots<{
+	content(): any;
+	prop(props: { foo: string }): any;
+}>();
+</script>
+
+<template>
+	<slot name="content" />
+	<slot name="prop" :foo="''" />
+</template>