fix

Author: sxzz

packages/runtime-core/src/apiSetupHelpers.ts

@@ -58,7 +58,13 @@ export function defineProps<
   PP extends ComponentObjectPropsOptions = ComponentObjectPropsOptions
 >(props: PP): Readonly<ExtractPropTypes<PP>>
 // overload 3: typed-based declaration
-export function defineProps<TypeProps>(): Readonly<TypeProps>
+export function defineProps<TypeProps>(): Readonly<
+  Omit<TypeProps, BooleanKey<TypeProps>> & {
+    [K in keyof Pick<TypeProps, BooleanKey<TypeProps>>]-?: NotUndefined<
+      TypeProps[K]
+    >
+  }
+>
 // implementation
 export function defineProps() {
   if (__DEV__) {
@@ -128,6 +134,12 @@ export function defineExpose<
 
 type NotUndefined<T> = T extends undefined ? never : T
 
+type BooleanKey<T, K extends keyof T = keyof T> = K extends any
+  ? [T[K]] extends [boolean | undefined]
+    ? K
+    : never
+  : never
+
 type InferDefaults<T> = {
   [K in keyof T]?: InferDefault<T, NotUndefined<T[K]>>
 }
@@ -142,14 +154,27 @@ type InferDefault<P, T> = T extends
   ? T | ((props: P) => T)
   : (props: P) => T
 
-type PropsWithDefaults<Base, Defaults> = Base & {
-  [K in keyof Defaults]: K extends keyof Base
+type PropsWithDefaults<Base, Defaults> = {
+  [K in keyof Base as K extends keyof Defaults
     ? Defaults[K] extends undefined
-      ? Base[K]
-      : NotUndefined<Base[K]>
-    : never
-}
-
+      ? never
+      : K
+    : K]: Base[K]
+} & {
+  [K in keyof Base as K extends keyof Defaults
+    ? Defaults[K] extends undefined
+      ? K
+      : never
+    : never]?: Base[K] | undefined
+} & Readonly<{
+    [K in keyof Defaults as Defaults[K] extends undefined
+      ? never
+      : K]: K extends keyof Base
+      ? Defaults[K] extends undefined
+        ? Base[K]
+        : NotUndefined<Base[K]>
+      : never
+  }>
 /**
  * Vue `<script setup>` compiler macro for providing props default values when
  * using type-based `defineProps` declaration.

test-dts/setupHelpers.test-d.ts

@@ -31,6 +31,8 @@ describe('defineProps w/ type declaration + withDefaults', () => {
       x?: string
       y?: string
       z?: string
+      bool?: boolean
+      boolAndUndefined: boolean | undefined
     }>(),
     {
       number: 123,
@@ -56,6 +58,9 @@ describe('defineProps w/ type declaration + withDefaults', () => {
   expectType<string | undefined>(res.x)
   expectType<string | undefined>(res.y)
   expectType<string>(res.z)
+
+  expectType<boolean>(res.bool)
+  expectType<boolean>(res.boolAndUndefined)
 })
 
 describe('defineProps w/ union type declaration + withDefaults', () => {