refactor(types): widen Component type to include consutructor types

returned from `defineComponent`

ref: https://github.com/vuejs/vue-router-next/pull/421
also close #1880

Previous `Component` type is now exported as `ConcreteComponent`.

This introduces a minor breaking change when calling `h(comp, { ... })`
will now fail if `comp` is a of generic `Component` type, since it does
not specify what props it expects.

packages/runtime-core/src/h.ts

@@ -68,11 +68,6 @@ interface Constructor<P = any> {
   new (): { $props: P }
 }
 
-// Excludes Component type from returned `defineComponent`
-type NotDefinedComponent<T extends Component> = T extends Constructor
-  ? never
-  : T
-
 // The following is a series of overloads for providing props validation of
 // manually written render functions.
 
@@ -117,9 +112,9 @@ export function h<P, E extends EmitsOptions = {}>(
 // catch-all for generic component types
 export function h(type: Component, children?: RawChildren): VNode
 
-// exclude `defineComponent`
-export function h<Options extends ComponentOptions | FunctionalComponent<{}>>(
-  type: NotDefinedComponent<Options>,
+// exclude `defineComponent` constructors
+export function h<T extends ComponentOptions | FunctionalComponent<{}>>(
+  type: T,
   props?: RawProps | null,
   children?: RawChildren | RawSlots
 ): VNode