fix(language-core): ensure type consistency for optional boolean props (#5803)

Author: johnsoncodehk

packages/language-core/lib/codegen/script/template.ts

@@ -77,16 +77,8 @@ function* generateTemplateCtx(
 		exps.push([`{} as { $emit: ${emitTypes.join(` & `)} }`]);
 	}
 
-	const { defineProps, withDefaults } = scriptSetupRanges ?? {};
-	const props = defineProps?.arg
-		? `typeof ${defineProps.name ?? names.props}`
-		: defineProps?.typeArg
-		? withDefaults?.arg
-			? `__VLS_WithDefaultsGlobal<${names.Props}, typeof ${names.defaults}>`
-			: `${names.Props}`
-		: undefined;
-	if (props) {
-		propTypes.push(props);
+	if (scriptSetupRanges?.defineProps) {
+		propTypes.push(`typeof ${scriptSetupRanges.defineProps.name ?? names.props}`);
 	}
 	if (scriptSetupRanges?.defineModel.length) {
 		propTypes.push(names.ModelProps);

test-workspace/tsc/passedFixtures/vue3/#3779/main.vue

@@ -6,5 +6,5 @@ defineProps<{
 </script>
 
 <template>
-	<h1>{{ exactType(optionalBoolean, {} as boolean | undefined) }}</h1>
+	<h1>{{ exactType(optionalBoolean, {} as boolean) }}</h1>
 </template>

test-workspace/tsc/passedFixtures/vue3/#3779/named.vue

@@ -6,5 +6,5 @@ defineProps<{
 </script>
 
 <template>
-	<h1>{{ exactType(optionalBoolean, {} as boolean | undefined) }}</h1>
+	<h1>{{ exactType(optionalBoolean, {} as boolean) }}</h1>
 </template>