amazingdesign/redux-rest-services

// It comes from great package I've been inspired by
// redux-api
// https://github.com/lexich/redux-api/blob/master/src/adapters/fetch.js

"use strict";

function processData(data) {
  try {
    return JSON.parse(data);
  } catch (err) {
    return data;
  }
}

function toJSON(resp) {
  if (resp.text) {
    return resp.text().then(processData);
  } else if (resp instanceof Promise) {
    return resp.then(processData);
  } else {
    return Promise.resolve(resp).then(processData);
  }
}

export default function (fetch) {
  return (url, opts) =>
    fetch(url, opts).then(resp => {
      // Normalize IE9's response to HTTP 204 when Win error 1223.
      const status = resp.status === 1223 ? 204 : resp.status;
      const statusText = resp.status === 1223 ? "No Content" : resp.statusText;

      if (status >= 400) {
        return Promise.reject({ status, statusText });
      } else {
        return toJSON(resp).then(data => {
          if (status >= 200 && status < 300) {
            return data;
          } else {
            return Promise.reject(data);
          }
        });
      }
    });
}