wp-calypso/client/landing/login/store.js

import { createStore, applyMiddleware, compose } from 'redux';
import { thunk as thunkMiddleware } from 'redux-thunk';
import analyticsMiddleware from 'calypso/state/analytics/middleware';
import currentUser from 'calypso/state/current-user/reducer';
import wpcomApiMiddleware from 'calypso/state/data-layer/wpcom-api-middleware';
import { combineReducers, addReducerEnhancer } from 'calypso/state/utils';

// Legacy reducers
// The reducers in this list are not modularized, and are always loaded on boot.
const rootReducer = combineReducers( {
	currentUser,
} );

const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;

export default () =>
	createStore(
		rootReducer,
		composeEnhancers(
			addReducerEnhancer,
			applyMiddleware( thunkMiddleware, wpcomApiMiddleware, analyticsMiddleware )
		)
	);