types: using unknown instead of any (#8152)

* types: using unknown instead of any

* chore: UnknownProp

src/utils/base.ts

@@ -1,8 +1,13 @@
+import { PropType } from 'vue';
+
 // eslint-disable-next-line @typescript-eslint/no-empty-function
 export function noop() {}
 
 export const inBrowser = typeof window !== 'undefined';
 
+// unknown type for Vue prop
+export const UnknownProp = (null as unknown) as PropType<unknown>;
+
 export function isDef<T>(val: T): val is NonNullable<T> {
   return val !== undefined && val !== null;
 }