fix(types): should unwrap tuple correctly (#3820)

fix #3819

packages/reactivity/src/ref.ts

@@ -280,13 +280,10 @@ export interface RefUnwrapBailTypes {}
 
 export type ShallowUnwrapRef<T> = {
   [K in keyof T]: T[K] extends Ref<infer V>
-    ? V
-    : // if `V` is `unknown` that means it does not extend `Ref` and is undefined
-    T[K] extends Ref<infer V> | undefined
-    ? unknown extends V
-      ? undefined
-      : V | undefined
-    : T[K]
+    ? V // if `V` is `unknown` that means it does not extend `Ref` and is undefined
+    : T[K] extends Ref<infer V> | undefined
+      ? unknown extends V ? undefined : V | undefined
+      : T[K]
 }
 
 export type UnwrapRef<T> = T extends ShallowRef<infer V>
@@ -303,7 +300,7 @@ export type UnwrapRefSimple<T> = T extends
   | RefUnwrapBailTypes[keyof RefUnwrapBailTypes]
   | { [RawSymbol]?: true }
   ? T
-  : T extends Array<any>
+  : T extends ReadonlyArray<any>
   ? { [K in keyof T]: UnwrapRefSimple<T[K]> }
   : T extends object & { [ShallowReactiveMarker]?: never }
   ? {

test-dts/reactivity.test-d.ts

@@ -60,3 +60,14 @@ describe('shallowReadonly ref unwrap', () => {
   expectType<Ref>(r.count.n)
   r.count.n.value = 123
 })
+
+// #3819
+describe('should unwrap tuple correctly', () => {
+  const readonlyTuple = [ref(0)] as const
+  const reactiveReadonlyTuple = reactive(readonlyTuple)
+  expectType<Ref<number>>(reactiveReadonlyTuple[0])
+
+  const tuple: [Ref<number>] = [ref(0)]
+  const reactiveTuple = reactive(tuple)
+  expectType<Ref<number>>(reactiveTuple[0])
+})