Update docs to avoid circular type

Author: EskiMojo14

docs/rtk-query/usage/persistence-and-rehydration.mdx

@@ -43,22 +43,27 @@ import { REHYDRATE } from 'redux-persist'
 
 type RootState = any // normally inferred from state
 
-function isHydrateAction(action: Action): action is PayloadAction<RootState> {
+function isHydrateAction(action: Action): action is Action<typeof REHYDRATE> & {
+  key: string
+  payload: RootState
+  err: unknown
+} {
   return action.type === REHYDRATE
 }
 
 export const api = createApi({
   baseQuery: fetchBaseQuery({ baseUrl: '/' }),
   // highlight-start
-  extractRehydrationInfo(action, { reducerPath }) {
+  // to prevent circular type issues, the return type needs to be annotated as any
+  extractRehydrationInfo(action, { reducerPath }): any {
     if (isHydrateAction(action)) {
-      if ((action as any).key === 'key used with redux-persist') {
-        // when persisting the api reducer
+      // when persisting the api reducer
+      if (action.key === 'key used with redux-persist') {
         return action.payload
       }
 
       // When persisting the root reducer
-      return action.payload[reducerPath]
+      return action.payload[api.reducerPath]
     }
   },
   // highlight-end

packages/toolkit/src/query/createApi.ts

@@ -175,14 +175,18 @@ export interface CreateApiOptions<
    *
    * type RootState = any; // normally inferred from state
    *
-   * function isHydrateAction(action: Action): action is PayloadAction<RootState> {
-   *   return action.type === HYDRATE
+   * function isHydrateAction(action: Action): action is Action<typeof REHYDRATE> & {
+   *   key: string
+   *   payload: RootState
+   *   err: unknown
+   * } {
+   *   return action.type === REHYDRATE
    * }
    *
    * export const api = createApi({
    *   baseQuery: fetchBaseQuery({ baseUrl: '/' }),
    *   // highlight-start
-   *   extractRehydrationInfo(action, { reducerPath }) {
+   *   extractRehydrationInfo(action, { reducerPath }): any {
    *     if (isHydrateAction(action)) {
    *       return action.payload[reducerPath]
    *     }