xod/packages/xod-func-tools/src/fetch.js

import * as R from 'ramda';

/**
 * Universal function, that normilizes fetch result to
 * rejected Promise. Useful to use with `retryOrFail` as `errFn`.
 *
 * There is two possible cases for `res` argument:
 * - contains Error object (E.G. network error)
 *   it will just merge a payload to the Error.
 * - contains response object (E.G. unwanted response status)
 *   it will create new Error with statusText and merged
 *   status, statusText and payload
 */
// :: Object -> (FetchResult | Error) -> Error
export const rejectFetchResult = R.curry(
  (payload, res) =>
    res.status
      ? Object.assign(
          new Error(res.statusText),
          {
            status: res.status,
            statusText: res.statusText,
          },
          payload
        )
      : Object.assign(res, payload)
);

export default {};