redux/es/index.js

import createStore from './createStore';
import combineReducers from './combineReducers';
import bindActionCreators from './bindActionCreators';
import applyMiddleware from './applyMiddleware';
import compose from './compose';
import warning from './utils/warning';

/*
* This is a dummy function to check if the function name has been altered by minification.
* If the function has been minified and NODE_ENV !== 'production', warn the user.
*/
function isCrushed() {}

if (process.env.NODE_ENV !== 'production' && typeof isCrushed.name === 'string' && isCrushed.name !== 'isCrushed') {
  warning('You are currently using minified code outside of NODE_ENV === \'production\'. ' + 'This means that you are running a slower development build of Redux. ' + 'You can use loose-envify (https://github.com/zertosh/loose-envify) for browserify ' + 'or DefinePlugin for webpack (http://stackoverflow.com/questions/30030031) ' + 'to ensure you have the correct code for your production build.');
}

export { createStore, combineReducers, bindActionCreators, applyMiddleware, compose };