fix(types): improve return type withKeys and withModifiers (#9734)

packages/dts-test/defineComponent.test-d.tsx

@@ -11,7 +11,9 @@ import {
   h,
   SlotsType,
   Slots,
-  VNode
+  VNode,
+  withKeys,
+  withModifiers
 } from 'vue'
 import { describe, expectType, IsUnion } from './utils'
 
@@ -1497,6 +1499,12 @@ describe('should work when props type is incompatible with setup returned type '
   expectType<SizeType>(CompA.$props.size)
 })
 
+describe('withKeys and withModifiers as pro', () => {
+  const onKeydown = withKeys(e => {}, [''])
+  const onClick = withModifiers(e => {}, [''])
+  ;<input onKeydown={onKeydown} onClick={onClick} />
+})
+
 import {
   DefineComponent,
   ComponentOptionsMixin,

packages/runtime-dom/src/directives/vOn.ts

@@ -32,19 +32,21 @@ const modifierGuards: Record<
 /**
  * @private
  */
-export const withModifiers = (
-  fn: Function & { _withMods?: Function },
+export const withModifiers = <
+  T extends (event: Event, ...args: unknown[]) => any
+>(
+  fn: T & { _withMods?: T },
   modifiers: string[]
 ) => {
   return (
     fn._withMods ||
-    (fn._withMods = (event: Event, ...args: unknown[]) => {
+    (fn._withMods = ((event, ...args) => {
       for (let i = 0; i < modifiers.length; i++) {
         const guard = modifierGuards[modifiers[i]]
         if (guard && guard(event, modifiers)) return
       }
       return fn(event, ...args)
-    })
+    }) as T)
   )
 }
 
@@ -63,8 +65,8 @@ const keyNames: Record<string, string | string[]> = {
 /**
  * @private
  */
-export const withKeys = (
-  fn: Function & { _withKeys?: Function },
+export const withKeys = <T extends (event: KeyboardEvent) => any>(
+  fn: T & { _withKeys?: T },
   modifiers: string[]
 ) => {
   let globalKeyCodes: LegacyConfig['keyCodes']
@@ -88,7 +90,7 @@ export const withKeys = (
 
   return (
     fn._withKeys ||
-    (fn._withKeys = (event: KeyboardEvent) => {
+    (fn._withKeys = (event => {
       if (!('key' in event)) {
         return
       }
@@ -123,6 +125,6 @@ export const withKeys = (
           }
         }
       }
-    })
+    }) as T)
   )
 }