How to get the AppDispatch Typescript type in redux toolkit when store is initialized with a function?

user_866886 0
Viewed 1697

Today my AppDispatch type is extracted from store.dispatch:

import { configureStore, combineReducers } from "@reduxjs/toolkit";
import auth from "./auth/authSlice";
const rootReducer = combineReducers({ auth });
const store = configureStore({
  reducer: rootReducer
});
export type RootState = ReturnType<typeof rootReducer>;
export type AppDispatch = typeof store.dispatch;
export default store;

Now I try to replace store with initStore function. I want to rehydrate my store using preloadedState.

import { configureStore, combineReducers } from "@reduxjs/toolkit";
import auth from "./auth/authSlice";
const rootReducer = combineReducers({ auth });
const store = (preloadedState={}) => {
  return configureStore({
    reducer: rootReducer,
    preloadedState,
  });
}
export type RootState = ReturnType<typeof rootReducer>;
export type AppDispatch = typeof store.dispatch;
export default store;

I have an error:

Property 'dispatch' does not exist on type '(preloadedState?: {}) => EnhancedStore<CombinedState<{ auth: AuthState; }>, AnyAction, [ThunkMiddleware<CombinedState<{ auth: AuthState; }>, AnyAction, null> | ThunkMiddleware<...>]>'.ts(2339)

How can I get the AppDispatch type correctly ?

redux-toolkit redux typescript
1 Answers

You've changed store from being an actual Redux store instance to "a function that returns a Redux store", without fixing the rest of your code to match that. So, the first issue is that typeof store.dispatch; won't work at that point in the code, because store is a function and not an actual store instance.

Beyond that, I'm not sure how you'd actually manage to get the type of dispatch here because you haven't created a store yet when the type is being defined. I suppose you could try something like this, but I don't know if it'll work:

const initStore = (preloadedState={}) => {
  return configureStore({
    reducer: rootReducer,
    preloadedState,
  });
}
export type RootState = ReturnType<typeof rootReducer>;
export type AppDispatch = ReturnType<typeof initStore>["dispatch"];
export default initStore ;
user_629370
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