TypeScript Firestore Reducer: A more efficient way to

I've been working on my reducers and have come across this piece of code:

import { Reducer, combineReducers } from 'redux';
import { routerReducer } from 'react-router-redux';
import { firebaseReducer } from 'react-redux-firebase';
import { firestoreReducer } from 'redux-firestore';

const reducers: Reducer<ApplicationState> = combineReducers<ApplicationState>({
  firebase: firebaseReducer,
  firestore: firestoreReducer,
  router: routerReducer
});

export { reducers };

While following a tutorial found here

However, I am facing an issue with the firestore reducer and getting this message:

Argument of type '{ firebase: typeof firebaseReducer; firestore: typeof firestoreReducer; router: Reducer<RouterSta...' is not assignable to parameter of type 'ReducersMapObject'.
  Property 'firestore' is incompatible with index signature.
    Type 'typeof firestoreReducer' is not assignable to type 'Reducer<any>'.
      Type 'typeof firestoreReducer' provides no match for the signature '(state: any, action: AnyAction): any'.

Any ideas on what might be causing this issue and how to resolve it?

Answer №1

It appears TS is on the hunt for a Reducer in the location occupied by firebaseReducer, but stumbled upon something different. In order to identify this 'something else', I delved into the types, uncovered this, and... was quickly befuddled. It seems like the types are not just flawed, they may as well be nonexistent. Perhaps manually casting it is the best solution here.

const reducers: Reducer<ApplicationState> = combineReducers<ApplicationState>({
  firebase: firebaseReducer,
  firestore: firestoreReducer as Reducer<ApplicationState>,
  router: routerReducer
});

I'd recommend considering raising an issue or submitting a PR for this. It's quite surprising that no one has encountered this issue before.

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