From 96d65e1ab58ee2e1e820e41fbc2a7c753555cdc2 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 16 Aug 2019 09:54:57 -0400
Subject: [PATCH] wip: improve ref typing

---
 packages/reactivity/__tests__/ref.spec.ts | 10 ++++++++++
 packages/reactivity/src/ref.ts            |  4 ++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/packages/reactivity/__tests__/ref.spec.ts b/packages/reactivity/__tests__/ref.spec.ts
index 94600eb1c..e5cff502f 100644
--- a/packages/reactivity/__tests__/ref.spec.ts
+++ b/packages/reactivity/__tests__/ref.spec.ts
@@ -61,4 +61,14 @@ describe('observer/value', () => {
     expect(dummy2).toBe(3)
     expect(dummy3).toBe(3)
   })
+
+  it('should unwrap nested values in types', () => {
+    const a = {
+      b: ref(0)
+    }
+
+    const c = ref(a)
+
+    expect(typeof (c.value.b + 1)).toBe('number')
+  })
 })
diff --git a/packages/reactivity/src/ref.ts b/packages/reactivity/src/ref.ts
index a3a67b868..d0dc26fed 100644
--- a/packages/reactivity/src/ref.ts
+++ b/packages/reactivity/src/ref.ts
@@ -6,7 +6,7 @@ import { reactive } from './reactive'
 export const knownValues = new WeakSet()
 
 export interface Ref<T> {
-  value: T
+  value: T extends Ref<infer V> ? Ref<V> : UnwrapRef<T>
 }
 
 const convert = (val: any): any => (isObject(val) ? reactive(val) : val)
@@ -24,7 +24,7 @@ export function ref<T>(raw: T): Ref<T> {
     }
   }
   knownValues.add(v)
-  return v
+  return v as any
 }
 
 export function isRef(v: any): v is Ref<any> {