// mi tienda.js

 import {createStore, combineReducers, applyMiddleware} from "redux"; import thunk from "redux-thunk"; import {composeWithDevTools} from "redux-devtools-extension"; import { //productsDetailReducer, productsReducer, } from "./reducers/productReducer"; import {userReducer} from "./reducers/useReducer"; const reducer = combineReducers({ products: productsReducer, //productDetails: productsDetailReducer, user: userReducer, }); const initialState = null; const middleware = [thunk]; const store = createStore( reducer, initialState, composeWithDevTools(applyMiddleware(...middleware)) ); export default store;

//ReductorProducto.js

 import { ALL_PRODUCT_FAIL, ALL_PRODUCT_REQUEST, ALL_PRODUCT_SUCCESS, CLEAR_ERRORS, } from "../constants/productConstants"; export const productsReducer = (state = {products: []}, action) => { switch (action.type) { case ALL_PRODUCT_REQUEST: return { loading: true, product: [], }; case ALL_PRODUCT_SUCCESS: return { loading: false, product: action.payload.products, productsCount: action.payload.productsCount, }; case ALL_PRODUCT_FAIL: return { loading: false, product: action.payload, }; case CLEAR_ERRORS: return { ...state, error: null, }; default: return state; } };

//index.js

 import React from "react"; import ReactDOM from "react-dom"; import App from "./App"; //import {BrowserRouter} from "react-router-dom"; import {Provider} from "react-redux"; import store from "./store"; ReactDOM.render( <Provider store={store}> <App /> </Provider>, document.getElementById("root") );

//Error

Error no detectado: el reductor de segmentos para la clave "usuario" se devolvió sin definir durante la inicialización. Si el estado pasado al reductor no está definido, debe devolver explícitamente el estado inicial. El estado inicial puede no ser indefinido. Si no desea establecer un valor para este reductor, puede usar nulo en lugar de indefinido.