fix: notify listeners on clearAll in mock

packages/react-native-mmkv/src/__tests__/hooks.test.tsx

@@ -41,6 +41,20 @@ test('hooks update when the value is changed directly through the instance', ()
   expect(result.current[0]).toStrictEqual('value 2')
 })
 
+test('hooks update when the instance is cleared', () => {
+  const { result } = renderHook(() => useMMKVString('string-key', mmkv))
+
+  act(() => {
+    result.current[1]('value')
+  })
+  expect(result.current[0]).toStrictEqual('value')
+
+  act(() => {
+    mmkv.clearAll()
+  })
+  expect(result.current[0]).toBeUndefined()
+})
+
 test('functional updates to hooks', () => {
   const Component: React.FC = () => {
     const [state, setState] = React.useState(0)

packages/react-native-mmkv/src/createMMKV/createMockMMKV.ts

@@ -31,7 +31,7 @@ export function createMockMMKV(
     isReadOnly: false,
     isEncrypted: false,
     clearAll: () => {
-      const keysBefore = storage.keys()
+      const keysBefore = Array.from(storage.keys())
       storage.clear()
       // Notify all listeners for all keys that were cleared
       for (const key of keysBefore) {