fix: improve vm types

This improves the signature of `mount` in order to have a proper type checking of `vm`.

src/mount.ts

@@ -41,14 +41,18 @@ interface MountingOptions {
   stubs?: Record<string, any>
 }
 
-export function mount<T extends any>(
-  originalComponent: any,
+export function mount<TestedComponent extends ComponentPublicInstance>(
+  originalComponent: new () => TestedComponent,
+  options?: MountingOptions
+): VueWrapper<TestedComponent>
+export function mount(
+  originalComponent: Component,
   options?: MountingOptions
 ): VueWrapper<any>
-export function mount<T extends ComponentPublicInstance>(
-  originalComponent: new () => T,
+export function mount(
+  originalComponent: any,
   options?: MountingOptions
-): VueWrapper<T> {
+): VueWrapper<any> {
   const component = { ...originalComponent }
 
   // Reset the document.body
@@ -158,5 +162,5 @@ export function mount<T extends ComponentPublicInstance>(
   // mount the app!
   const app = vm.mount(el)
 
-  return createWrapper<T>(app, events, setProps)
+  return createWrapper(app, events, setProps)
 }

test-dts/index.d-test.ts

@@ -9,5 +9,15 @@ const App = defineComponent({
   template: ''
 })
 
-const wrapper = mount(App)
-expectType<any>(wrapper.vm.a) // should be string
+let wrapper = mount(App)
+expectType<string>(wrapper.vm.a)
+
+const AppWithoutDefine = {
+  props: {
+    a: String
+  },
+  template: ''
+}
+
+wrapper = mount(AppWithoutDefine)
+expectType<string>(wrapper.vm.a)