fix(types): fix typescript error when spreading $props(#5968)

test-dts/componentTypeExtensions.test-d.tsx

@@ -44,6 +44,7 @@ export const Custom = defineComponent({
 expectType<JSX.Element>(<Custom baz={1} />)
 expectType<JSX.Element>(<Custom custom={1} baz={1} />)
 expectType<JSX.Element>(<Custom bar="bar" baz={1} />)
+expectType<JSX.Element>(<Custom ref={''} bar="bar" baz={1} />)
 
 // @ts-expect-error
 expectType<JSX.Element>(<Custom />)

test-dts/defineComponent.test-d.tsx

@@ -1144,6 +1144,25 @@ describe('DefineComponent should infer correct types when assigning to Component
   expectType<Component>(component)
 })
 
+// #5969
+describe('should allow to assign props', () => {
+  const Child = defineComponent({
+    props: {
+      bar: String
+    }
+  })
+
+  const Parent = defineComponent({
+    props: {
+      ...Child.props,
+      foo: String
+    }
+  })
+
+  const child = new Child()
+  expectType<JSX.Element>(<Parent {...child.$props} />)
+})
+
 // check if defineComponent can be exported
 export default {
   // function components