automatic-combine-reducers.js

import { combineReducers } from 'redux';

// Define the context to search files
const CONTEXT = require.context('./', true, /\.\/(.*)\/index.js?$/i);

// Populate a object with the reducer
const importReducer = (req) => (obj, path) => {
  const [, componentName] = path.match(/\.\/(.*)\/index.js?$/i);
  const reducer = {
    [componentName]: req(path).default
  };

  return Object.assign({}, obj, reducer);
};

// Generate a object with all reducers
const getReducers = (ctx) =>
  ctx.keys().reduce(importReducer(ctx), {});

// Export my root reducer
export default combineReducers(getReducers(CONTEXT));