Unrejectable fetch

fetcher.js

import fetch from 'isomorphic-fetch';

export default function fetcher(url, options = {}) {
  return new Promise((resolve) => {
    fetch(url, Object.assign({}, {
      credentials: 'same-origin',
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
    }, options))
    .then(response => {
      const status = +response.status;

      response.json()
        .then(data => resolve({ status, data }))
        .catch(error => resolve({ status, error }));
    })
    .catch(error => resolve({ error }));
  });
}

Usage inside generator:

const { status, data, error } = yield fetcher('/some/url');

if (error) {
  console.log('error', error);
  return;
}

console.log('data', data)

Go-style error handling