Warp fetch with promise to reach timeout function.

timeoutFetch.js

// Reference from @github/fetch issue 175
// https://github.com/github/fetch/issues/175#issuecomment-125779262
function timeoutPromise(ms, promise) {
  return new Promise((resolve, reject) => {
    const timeoutId = setTimeout(() => {
      reject(new Error("promise timeout"))
    }, ms);
    promise.then(
      (res) => {
        clearTimeout(timeoutId);
        resolve(res);
      },
      (err) => {
        clearTimeout(timeoutId);
        reject(err);
      }
    );
  })
}

// Reference from @pepperoni-app-kit
// https://github.com/futurice/pepperoni-app-kit/blob/master/src/utils/api.js
function timeout(promise, ms) {
  return new Promise((resolve, reject) => {
    const timer = setTimeout(() => reject(new Error('timeout')), ms);
    promise
      .then(response => {
        clearTimeout(timer);
        resolve(response);
      })
      .catch(reject);
  });
}