Require modules from all files in subdirectories as a nested object

configureStore.js

function requireAll(requireContext) {
  return requireContext.keys().reduce((previous, current) => {
    const name = current.substring(current.lastIndexOf('/') + 1, current.lastIndexOf('.'));
    previous[name] = requireContext(current);
    return previous;
  }, {});
}

const actionCreators = requireAll(require.context('../actions', true, /^\.\/.*\.js$/));