types: fix failed typings?

packages/runtime-core/__tests__/apiTemplateRef.spec.ts

@@ -4,7 +4,6 @@ import {
   h,
   render,
   nextTick,
-  Ref,
   createComponent
 } from '@vue/runtime-test'
 
@@ -142,7 +141,7 @@ describe('api: template refs', () => {
       foo: ref(null),
       bar: ref(null)
     }
-    const refKey: Ref<keyof typeof refs> = ref('foo')
+    const refKey = ref<keyof typeof refs>('foo')
 
     const Comp = {
       setup() {

packages/runtime-core/src/apiWatch.ts

@@ -72,7 +72,10 @@ export function watch<T>(
 // Readonly constraint helps the callback to correctly infer value types based
 // on position in the source array. Otherwise the values will get a union type
 // of all possible value types.
-export function watch<T extends Readonly<WatcherSource<unknown>[]>>(
+export function watch<
+  T extends Readonly<WatcherSource<TArgs>>,
+  TArgs extends Array<any> = any[]
+>(
   sources: T,
   cb: WatchHandler<MapSources<T>>,
   options?: WatchOptions