old_contents: import { createStore, applyMiddleware, compose } from 'redux';
  import thunk from 'redux-thunk';
  import createLogger from 'redux-logger';
  import { hashHistory } from 'react-router';
  import { routerMiddleware } from 'react-router-redux';
  import rootReducer from '../reducers';
  
  const logger = createLogger({
    level: 'info',
    collapsed: true,
  });
  
  const router = routerMiddleware(hashHistory);
  
  const enhancer = compose(
    applyMiddleware(thunk, router, logger),
    window.devToolsExtension ? window.devToolsExtension() : noop => noop
  );
  
  export default function configureStore(initialState) {
    const store = createStore(rootReducer, initialState, enhancer);
  
    if (module.hot) {
      module.hot.accept('../reducers', () =>
        store.replaceReducer(require('../reducers')) // eslint-disable-line global-require
      );
    }
  
    return store;
  }
  
new_contents: import { createStore, applyMiddleware, compose } from 'redux';
  import thunk from 'redux-thunk';
  import createLogger from 'redux-logger';
  import { hashHistory } from 'react-router';
  import { routerMiddleware, push } from 'react-router-redux';
  import rootReducer from '../reducers';
  
  import * as counterActions from '../actions/counter';
  
  const actionCreators = {
    ...counterActions,
    push,
  };
  
  const logger = createLogger({
    level: 'info',
    collapsed: true,
  });
  
  const router = routerMiddleware(hashHistory);
  
  const enhancer = compose(
    applyMiddleware(thunk, router, logger),
    window.devToolsExtension ?
      window.devToolsExtension({ actionCreators }) :
      noop => noop
  );
  
  export default function configureStore(initialState) {
    const store = createStore(rootReducer, initialState, enhancer);
  
    if (module.hot) {
      module.hot.accept('../reducers', () =>
        store.replaceReducer(require('../reducers')) // eslint-disable-line global-require
      );
    }
  
    return store;
  }
  
subject: Add actionCreators option for window.devToolsExtension()