From 185d659e2af3627d28f6dc06f33e9ef881efcc43 Mon Sep 17 00:00:00 2001
From: SerKo <serko.dev@gmail.com>
Date: Fri, 9 Jan 2026 01:12:38 +0800
Subject: [PATCH 1/3] fix(language-core): return `keyof T` type if it extends
 string in `__VLS_vFor`

---
 packages/language-core/types/template-helpers.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/language-core/types/template-helpers.d.ts b/packages/language-core/types/template-helpers.d.ts
index 8382687cd7..b98ff3428a 100644
--- a/packages/language-core/types/template-helpers.d.ts
+++ b/packages/language-core/types/template-helpers.d.ts
@@ -110,7 +110,7 @@ declare global {
 		: T extends string ? [string, number][]
 		: T extends (infer U)[] ? [U, number][]
 		: T extends Iterable<infer V> ? [V, number][]
-		: [T[keyof T], `${keyof T & (string | number)}`, number][];
+		: [T[keyof T], keyof T extends string ? keyof T : `${keyof T & (string | number)}`, number][];
 	function __VLS_vSlot<S, D extends S>(slot: S, decl?: D): D extends (...args: infer P) => any ? P : any[];
 	function __VLS_asFunctionalDirective<T, ObjectDirective>(
 		dir: T,

From ef226468a6afd29b46f8697a346198523a12d642 Mon Sep 17 00:00:00 2001
From: SerKo <serko.dev@gmail.com>
Date: Fri, 9 Jan 2026 01:12:48 +0800
Subject: [PATCH 2/3] test: add test unit

---
 test-workspace/tsc/#5927/main.vue      | 21 +++++++++++++++++++++
 test-workspace/tsc/#5927/tsconfig.json |  4 ++++
 test-workspace/tsc/tsconfig.json       |  3 +++
 3 files changed, 28 insertions(+)
 create mode 100644 test-workspace/tsc/#5927/main.vue
 create mode 100644 test-workspace/tsc/#5927/tsconfig.json

diff --git a/test-workspace/tsc/#5927/main.vue b/test-workspace/tsc/#5927/main.vue
new file mode 100644
index 0000000000..305eb3b2af
--- /dev/null
+++ b/test-workspace/tsc/#5927/main.vue
@@ -0,0 +1,21 @@
+<script setup lang="ts">
+enum EnumA {
+  Value1 = 'v1',
+  Value2 = 'v2',
+}
+
+const definitions: {
+  [key in EnumA]: string;
+} = {
+  [EnumA.Value1]: 'test1',
+  [EnumA.Value2]: 'test2',
+};
+
+const test = (key: EnumA, value: string) => `${key}: ${value}`;
+</script>
+
+<template>
+  <template v-for="(row, rowIndex) of definitions" :key="rowIndex">
+    {{ test(rowIndex, row) }}
+  </template>
+</template>
diff --git a/test-workspace/tsc/#5927/tsconfig.json b/test-workspace/tsc/#5927/tsconfig.json
new file mode 100644
index 0000000000..974d85027b
--- /dev/null
+++ b/test-workspace/tsc/#5927/tsconfig.json
@@ -0,0 +1,4 @@
+{
+	"extends": "../../tsconfig.base.json",
+	"include": ["**/*"]
+}
diff --git a/test-workspace/tsc/tsconfig.json b/test-workspace/tsc/tsconfig.json
index 096c081266..72f0da1f6b 100644
--- a/test-workspace/tsc/tsconfig.json
+++ b/test-workspace/tsc/tsconfig.json
@@ -511,6 +511,9 @@
 		{
 			"path": "./#5899/tsconfig.json"
 		},
+		{
+			"path": "./#5927/tsconfig.json"
+		},
 		{
 			"path": "./#625/tsconfig.json"
 		},

From f5aa199bdda8715ed81a7abcd00ed7b49c72a746 Mon Sep 17 00:00:00 2001
From: SerKo <serko.dev@gmail.com>
Date: Fri, 9 Jan 2026 01:20:58 +0800
Subject: [PATCH 3/3] test: update

---
 test-workspace/tsc/#5927/main.vue | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/test-workspace/tsc/#5927/main.vue b/test-workspace/tsc/#5927/main.vue
index 305eb3b2af..81a038bab7 100644
--- a/test-workspace/tsc/#5927/main.vue
+++ b/test-workspace/tsc/#5927/main.vue
@@ -1,21 +1,23 @@
 <script setup lang="ts">
+import { exactType } from '../shared';
+
 enum EnumA {
-  Value1 = 'v1',
-  Value2 = 'v2',
+  Foo = 'foo',
+  Bar = 'bar',
 }
 
-const definitions: {
+const enumKeyRecord: {
   [key in EnumA]: string;
 } = {
-  [EnumA.Value1]: 'test1',
-  [EnumA.Value2]: 'test2',
+  [EnumA.Foo]: 'a',
+  [EnumA.Bar]: 'b',
 };
-
-const test = (key: EnumA, value: string) => `${key}: ${value}`;
 </script>
 
 <template>
-  <template v-for="(row, rowIndex) of definitions" :key="rowIndex">
-    {{ test(rowIndex, row) }}
+  <template v-for="(row, rowIndex, index) of enumKeyRecord" :key="rowIndex">
+    {{ exactType(row, {} as string) }}
+    {{ exactType(rowIndex, {} as EnumA) }}
+    {{ exactType(index, {} as number) }}
   </template>
 </template>