example of widget and potential auth implementation reducer

reducer.js

import { combineReducers } from 'redux';
import {
    ADD_WIDGET, REMOVE_WIDGET,
    LOGIN_REQUEST, LOGIN_SUCCESS, LOGIN_FAILURE, LOGOUT_SUCCESS,
} from '../actions';

function widgets(state = [], action) {
    let clonedState = JSON.parse(JSON.stringify(state));
    switch(action.type) {
        case ADD_WIDGET:
            return [...clonedState, action.widget];
        case REMOVE_WIDGET:
            let temp = clonedState.splice(action.idx, 1);
            return [...clonedState];
        default:
            return state;
    }
}

function auth(state = {
    isFetching: false,
    isAuthenticated: localStorage.getItem('id_token') ? true : false
    }, action) {
    switch(action.type) {
        case LOGIN_REQUEST:
            return Object.assign({}, state, {
                isFetching: true,
                isAuthenticated: false,
                user: action.creds
            });
        case LOGIN_SUCCESS:
            return Object.assign({}, state, {
                isFetching: false,
                isAuthenticated: true,
                errorMessage: ''
            });
        case LOGIN_FAILURE:
            return Object.assign({}, state, {
                isFetching: false,
                isAuthenticated: false,
                errorMessage: action.message
            });
        case LOGOUT_SUCCESS:
            return Object.assign({}, state, {
                isFetching: true,
                isAuthenticated: false
            });
        default:
            return state;
    }
}

export default combineReducers({
    widgets,
    auth
});