httpClientMiddleware.js

export default function httpClientMiddleware(clientImpl = window.fetch) {
  return (store) => {
    return (next) => (action) => {
      const { httpClient, types, ...rest } = action;
      if (!httpClient)
        return next(action);

      const [REQUEST, SUCCESS, FAILURE] = types;

      httpClient(clientImpl).then(
        (result) => result.json()
      ).then(
        (result) => store.dispatch({result, type: SUCCESS}),
        (error) => store.dispatch({error, type: FAILURE})
      );

      return next({...rest, type: REQUEST});
    };
  };
}