diff --git a/packages/vue-typescript/src/utils/localTypes.ts b/packages/vue-typescript/src/utils/localTypes.ts
index c736093fe..ac53d1a61 100644
--- a/packages/vue-typescript/src/utils/localTypes.ts
+++ b/packages/vue-typescript/src/utils/localTypes.ts
@@ -62,8 +62,8 @@ export type GlobalComponents =
 export declare function getVforSourceType<T>(source: T): ForableSource<NonNullable<T extends number ? number[] : T extends string ? string[] : T>>;
 export declare function getNameOption<T>(t?: T): T extends { name: infer N } ? N : undefined;
 export declare function directiveFunction<T>(dir: T):
-	T extends ObjectDirective<infer E, infer V> ? (value: V) => void
-	: T extends FunctionDirective<infer E, infer V> ? (value: V) => void
+	T extends ObjectDirective<infer E, infer V> ? undefined extends V ? (value?: V) => void : (value: V) => void
+	: T extends FunctionDirective<infer E, infer V> ? undefined extends V ? (value?: V) => void : (value: V) => void
 	: T;
 
 export type TemplateSlots<T> = T extends { __VLS_slots: infer S } ? S : {};