fix(data-hooks): ensure intervalRef is initialized as undefined

Author: hotlong

examples/app-react-crud/mocks/node-polyfills.ts

@@ -29,6 +29,16 @@ export const promises = {
   rm: async () => {},
 };
 
+// os polyfills
+export const type = () => 'Browser';
+export const platform = () => 'browser';
+export const release = () => '1.0.0';
+export const tmpdir = () => '/tmp';
+export const homedir = () => '/';
+export const endianness = () => 'LE';
+export const arch = () => 'javascript';
+export const EOL = '\n';
+
 export const readFileSync = () => '';
 export const writeFileSync = () => {};
 export const statSync = () => ({ isDirectory: () => false, isFile: () => false, isSymbolicLink: () => false });
@@ -45,20 +55,25 @@ export const relative = () => '';
 export const posix = {};
 export const win32 = {};
 
+// fs/promises and other missing exports
+export const open = async () => ({ close: async () => {} });
+export const watchFile = () => {};
+export const unwatchFile = () => {};
+
 export const fileURLToPath = () => '';
 export const pathToFileURL = () => '';
 
 export const readdir = () => {};
 export const readdirSync = () => [];
 export const readlink = () => {};
 export const readlinkSync = () => '';
-export const realpath = () => {};
+export const realpath = async () => '';
 export const realpathSync = () => '';
 realpathSync.native = () => '';
 
 export const constants = {};
-export const lstat = () => {};
-export const stat = () => {};
+export const lstat = async () => ({ isDirectory: () => false, isFile: () => false, isSymbolicLink: () => false });
+export const stat = async () => ({ isDirectory: () => false, isFile: () => false, isSymbolicLink: () => false });
 export const access = () => {};
 export const accessSync = () => {};
 export const mkdir = () => {};

packages/client-react/src/data-hooks.tsx

@@ -85,7 +85,7 @@ export function useQuery<T = any>(
   const [isLoading, setIsLoading] = useState(true);
   const [isRefetching, setIsRefetching] = useState(false);
   const [error, setError] = useState<Error | null>(null);
-  const intervalRef = useRef<NodeJS.Timeout>();
+  const intervalRef = useRef<NodeJS.Timeout | undefined>(undefined);
 
   const {
     query,