fix(typescript-types): Prevent distribution in IsKeyOf<T,K>

2025-07-17 16:35:11 +02:00
parent 7decf5ea45
commit 96cf6bbc48
2 changed files with 7 additions and 4 deletions
--- a/packages/typescript-types/src/is-key-of.ts
+++ b/packages/typescript-types/src/is-key-of.ts
@@ -1,4 +1,8 @@
 import type { If } from './if.js'
 import type { IsNever } from './is-never.js'

-export type IsKeyOf<T, K> = If<IsNever<T>, false, If<IsNever<K>, false, K extends keyof T ? true : false>>
+export type IsKeyOf<Obj, Key> = If<
+	IsNever<Key>,
+	false,
+	[Key] extends [keyof Obj] ? If<IsNever<Obj[Key]>, false, true> : false
+>