refactor(runtime-vapor): remove default value

Author: sxzz

packages/runtime-vapor/__tests__/dom/prop.spec.ts

@@ -18,7 +18,7 @@ import { getCurrentScope } from '@vue/reactivity'
 
 let removeComponentInstance = NOOP
 beforeEach(() => {
-  const instance = createComponentInstance((() => {}) as any, {})
+  const instance = createComponentInstance((() => {}) as any, {}, null, null)
   const reset = setCurrentInstance(instance)
   const prev = getCurrentScope()
   instance.scope.on()

packages/runtime-vapor/src/component.ts

@@ -259,10 +259,10 @@ let uid = 0
 export function createComponentInstance(
   component: ObjectComponent | FunctionalComponent,
   rawProps: RawProps | null,
-  slots: Slots | null = null,
-  dynamicSlots: DynamicSlots | null = null,
+  slots: Slots | null,
+  dynamicSlots: DynamicSlots | null,
   // application root node only
-  appContext: AppContext | null = null,
+  appContext?: AppContext,
 ): ComponentInternalInstance {
   const parent = getCurrentInstance()
   const _appContext =