fix(language-core): align types of v-for with core (vuejs#5084)

packages/language-core/lib/codegen/globalTypes.ts

@@ -117,23 +117,20 @@ export function generateGlobalTypes(options: VueCompilerOptions) {
 	>>;
 	type __VLS_UseTemplateRef<T> = Readonly<import('${lib}').ShallowRef<T | null>>;
 
-	function __VLS_getVForSourceType(source: number): [number, number, number][];
-	function __VLS_getVForSourceType(source: string): [string, number, number][];
+	function __VLS_getVForSourceType(source: number): [number, number][];
+	function __VLS_getVForSourceType(source: string): [string, number][];
 	function __VLS_getVForSourceType<T extends any[]>(source: T): [
 		item: T[number],
-		key: number,
 		index: number,
 	][];
 	function __VLS_getVForSourceType<T extends { [Symbol.iterator](): Iterator<any> }>(source: T): [
 		item: T extends { [Symbol.iterator](): Iterator<infer T1> } ? T1 : never, 
-		key: number,
-		index: undefined,
+		index: number,
 	][];
 	// #3845
 	function __VLS_getVForSourceType<T extends number | { [Symbol.iterator](): Iterator<any> }>(source: T): [
 		item: number | (Exclude<T, number> extends { [Symbol.iterator](): Iterator<infer T1> } ? T1 : never), 
-		key: number,
-		index: undefined,
+		index: number,
 	][];
 	function __VLS_getVForSourceType<T>(source: T): [
 		item: T[keyof T],

test-workspace/tsc/passedFixtures/shared.d.ts

@@ -3,8 +3,3 @@ type IfEquals<T, U, Y = unknown, N = never> =
 	(<G>() => G extends T ? 1 : 2) extends
 	(<G>() => G extends U ? 1 : 2) ? Y : N;
 export declare function exactType<T, U>(draft: T & IfEquals<T, U>, expected: U & IfEquals<T, U>): IfEquals<T, U>;
-
-// https://stackoverflow.com/a/49928360
-type IfNotAny<T> = 0 extends 1 & T ? never : T;
-type IfNotUndefined<T> = Exclude<T, undefined> extends never ? never : T;
-export declare function isNotAnyOrUndefined<T>(value: IfNotAny<IfNotUndefined<T>>): void;

test-workspace/tsc/passedFixtures/vue3/v-for/main.vue

@@ -1,65 +1,53 @@
 <template>
   <!-- number -->
-  <div v-for="(val, key) in 10">
+  <div v-for="(val, index) in 10">
     {{ exactType(val, {} as number) }}
-    {{ isNotAnyOrUndefined(val) }}
-    {{ exactType(key, {} as number) }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
   <!-- string -->
-  <div v-for="(val, key) in 'foo'">
+  <div v-for="(val, index) in 'foo'">
     {{ exactType(val, {} as string) }}
-    {{ isNotAnyOrUndefined(val) }}
-    {{ exactType(key, {} as number) }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
   <!-- array -->
-  <div v-for="(val, key) in arr">
+  <div v-for="(val, index) in arr">
     {{ exactType(val, {} as 'a' | 'b') }}
-    {{ isNotAnyOrUndefined(val) }}
-    {{ exactType(key, {} as number) }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
   <!-- map -->
-  <div v-for="(val, key) in map">
+  <div v-for="(val, index) in map">
     {{ exactType(val, {} as [string, number]) }}
-    {{ isNotAnyOrUndefined(val) }}
-    {{ exactType(key, {} as number) }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
   <!-- obj -->
-  <div v-for="(val, key) in obj">
+  <div v-for="(val, key, index) in obj">
     {{ exactType(val, {} as string | number) }}
-    {{ isNotAnyOrUndefined(val) }}
     {{ exactType(key, {} as 'a' | 'b') }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
   <!-- objUnion -->
-  <div v-for="(val, key) in objUnion">
+  <div v-for="(val, key, index) in objUnion">
     <!-- {{ exactType(val, {} as string | number) }} -->
     {{ exactType(val, {} as string) }}
-    {{ isNotAnyOrUndefined(val) }}
     <!-- {{ exactType(key, {} as 'a' | 'b') }} -->
     {{ exactType(key, {} as 'a') }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
   <!-- record -->
-  <div v-for="(val, key) in record">
+  <div v-for="(val, key, index) in record">
     {{ exactType(val, {} as string) }}
-    {{ isNotAnyOrUndefined(val) }}
     {{ exactType(key, {} as string) }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
   <!-- any -->
-  <div v-for="(val, key) in _any">
+  <div v-for="(val, index) in _any">
     {{ exactType(val, {} as any) }}
-    {{ exactType(key, {} as number) }}
-    {{ isNotAnyOrUndefined(key) }}
+    {{ exactType(index, {} as number) }}
   </div>
 </template>
 
 <script setup lang="ts">
-import { exactType, isNotAnyOrUndefined } from '../../shared';
+import { exactType } from '../../shared';
 
 const arr = ['a', 'b'] as const;
 const map = new Map<string, number>();