docs: warn against custom middleware + typeof store.getState TS circular reference

Author: firstred

docs/usage/usage-with-typescript.md

@@ -39,6 +39,23 @@ const store = configureStore({
 export type RootState = ReturnType<typeof store.getState>
 ```
 
+Note that passing the reducers directly is not recommended when you need to add custom middleware,
+because this can cause a circular reference in TypeScript:
+
+```typescript
+import { configureStore } from '@reduxjs/toolkit'
+import rootReducer from './rootReducer'
+const store = configureStore({
+  reducer: rootReducer,
+  middleware: [
+    ...customMiddleware,
+    ...getDefaultMiddleware<RootState>(),
+  ] as const,
+})
+// TS2456: Type alias 'RootState' circularly references itself.
+export type RootState = ReturnType<typeof store.getState>
+```
+
 ### Getting the `Dispatch` type
 
 If you want to get the `Dispatch` type from your store, you can extract it after creating the store.