Tips for initializing the preloaded state in redux toolkit using typescript

Currently in the process of:

export let store = null;

export default function getStore(incomingPreloadState?: any) {
  store = configureStore({
    reducer: { 
      content: ContentSlice
    },
    preloadedState: incomingPreloadState,
  });
  return store;
}
export type AppState = ReturnType<typeof store.getState>
export type AppDispatch = typeof store.dispatch

It's evident that I'm encountering an error regarding the possible null value of the store

Answer №1

There's a more complex situation at play here. It might not be the best idea to have a module-global store variable that always refers to "the last store created." Mixing up multiple store instances could easily happen this way, so it's better to avoid it.

To ensure the store has the correct type, you'll need to manually invoke combineReducers.

const rootReducer = combineReducers({
  content: ContentSlice
})

export default function getStore(incomingPreloadState?: AppState) {
  const store = configureStore({
    reducer: rootReducer,
    preloadedState: incomingPreloadState,
  });
  return store;
}
export type AppState = ReturnType<typeof rootReducer>
export type AppDispatch = ReturnType<typeof getStore>['dispatch']

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