Redux-saga store config error with combineReducer - redux

Question

I try to config my saga store with Redux-saga, but I keep getting error about
Store does not have a valid reducer. Make sure the argument passed to combineReducers is an object whose values are reducers.
I did google around check the documentation, adjust my code still have the issue, so hoping someone can point out for me. Thanks!
if I change this code
const sagaMiddleware = ReduxSaga.default();
to
const sagaMiddleware =()=> ReduxSaga.default();
I got other error about: sagaMiddleware.run is not a function
Main.js
const { createStore, applyMiddleware } = require("redux");
const { createSelector } = require("reselect");
const ReduxSaga = require("redux-saga");
const createSagaMiddleware = require("redux-saga");
const reducer = require("./reducers/index");
const { workerSaga } = require("./sagas/sampleSaga.js");
const sagaMiddleware = ReduxSaga.default();
const store = createStore(reducer, applyMiddleware(sagaMiddleware));
sagaMiddleware.run(workerSaga);
Reducers/index.js
const { combineReducers } = require("redux");
const sample1 = require("./sample1");
const sample2 = require("./sample2");
const rootReducer = combineReducers({
sample1,
sample2
});
module.exports = rootReducer;
Reducers/sample1.js
const {
STARTS_LOADING_SAMPLE,
FETCH_SAMPLE,
COMPLETE_FETCHING_SAMPLE
} = require("../actions/index");
const sampleInitialState = {
fetching: false,
complete: false,
sample1: []
};
//switch statement....
module.exports = {
sample1: (allReducer, sampleInitialState)
};

Answer 1

The reducer is a pure function that takes the previous state and an action, and returns the next state. But you are exporting an object instead of a function in Reducers/sample1.js file. Try changing it to something like this:
...
module.exports = function(state = sampleInitialState, action) {
// switch statements
};
More on reducers: https://redux.js.org/basics/reducers