fix(vanilla): revert #970

src/vanilla.ts

@@ -92,8 +92,10 @@ const createSnapshotDefault = <T extends object>(
     if (refSet.has(value as object)) {
       markToTrack(value as object, false) // mark not to track
     } else if (proxyStateMap.has(value as object)) {
-      const [target] = proxyStateMap.get(value as object) as ProxyState
-      desc.value = createSnapshotDefault(target, version) as Snapshot<T>
+      const [target, ensureVersion] = proxyStateMap.get(
+        value as object,
+      ) as ProxyState
+      desc.value = createSnapshotDefault(target, ensureVersion()) as Snapshot<T>
     }
     Object.defineProperty(snap, key, desc)
   })

tests/basic.test.tsx

@@ -497,3 +497,35 @@ it('respects property enumerability (#726)', async () => {
   const x = proxy(Object.defineProperty({ a: 1 }, 'b', { value: 2 }))
   expect(Object.keys(snapshot(x))).toEqual(Object.keys(x))
 })
+
+it('stable snapshot object (#985)', async () => {
+  const state = proxy({ count: 0, obj: {} })
+
+  let effectCount = 0
+
+  const TestComponent = () => {
+    const { count, obj } = useSnapshot(state)
+    useEffect(() => {
+      ++effectCount
+    }, [obj])
+    return (
+      <>
+        <div>count: {count}</div>
+        <button onClick={() => ++state.count}>button</button>
+      </>
+    )
+  }
+
+  const { getByText, findByText } = render(<TestComponent />)
+
+  await findByText('count: 0')
+  expect(effectCount).toBe(1)
+
+  fireEvent.click(getByText('button'))
+  await findByText('count: 1')
+  expect(effectCount).toBe(1)
+
+  fireEvent.click(getByText('button'))
+  await findByText('count: 2')
+  expect(effectCount).toBe(1)
+})

tests/snapshot.test.ts

@@ -79,7 +79,15 @@ it('should not change snapshot with modifying the original proxy', async () => {
   expect(snap2.obj2.nested.count).toBe(2)
 })
 
-describe('snapsoht typings', () => {
+it('should return stable nested snapshot object', async () => {
+  const state = proxy({ count: 0, obj: {} })
+  const snap1 = snapshot(state)
+  state.count++
+  const snap2 = snapshot(state)
+  expect(snap2.obj).toBe(snap1.obj)
+})
+
+describe('snapshot typings', () => {
   it('converts object properties to readonly', () => {
     expectType<
       TypeEqual<