fix(language-core): @ts-ignore not working for slots

close #4263

packages/language-core/lib/generators/template.ts

@@ -814,7 +814,6 @@ export function* generate(
 			}
 			const slotBlockVars: string[] = [];
 			yield _ts(`{\n`);
-			yield* resetDirectiveComments('end of element slot start');
 			let hasProps = false;
 			if (slotDir?.exp?.type === CompilerDOM.NodeTypes.SIMPLE_EXPRESSION) {
 
@@ -868,6 +867,8 @@ export function* generate(
 				localVars.set(varName, (localVars.get(varName) ?? 0) + 1);
 			});
 
+			yield* resetDirectiveComments('end of slot children start');
+
 			let prev: CompilerDOM.TemplateChildNode | undefined;
 			for (const childNode of node.children) {
 				yield* generateAstNode(childNode, parentEl, prev, componentCtxVar);

test-workspace/tsc/vue3/#4263/main.vue

@@ -0,0 +1,26 @@
+<template>
+	<SomeComponent some-prop>
+		<!-- @vue-ignore -->
+		<template #item="{ item: itemSlot }">
+			<slot name="item" :item="(itemSlot as any)"></slot>
+		</template>
+	</SomeComponent>
+
+	<!-- @vue-ignore -->
+	<SomeComponent some-prop #item="{ item: itemSlot }">
+		<slot name="item" :item="(itemSlot as any)"></slot>
+	</SomeComponent>
+
+	<!-- @vue-ignore -->
+	<SomeComponent some-prop #item="{ item: itemSlot }"></SomeComponent>
+	<!-- @vue-expect-error -->
+	<SomeComponent some-prop #item="{ item: itemSlot }"></SomeComponent>
+</template>
+
+<script setup lang="ts">
+declare const SomeComponent: new () => {
+	$slots: {
+		item(props: {}): any;
+	};
+};
+</script>