make `fetch` API compatible with deprecated `request` library

request-compat.js

import { URLSearchParams } from 'url'

/**
 * @description for Map<string, any> only
 * @param {Map} map
 */
export const mapToObj = map =>
  Array.from(map).reduce(
    (obj, [key, value]) => Object.assign(obj, { [key]: value }),
    {}
  )

/**
 *
 * @param {Promise[]}} promises
 */
const success = promises => {
  return Promise.all(
    promises.map(p => {
      return p.then(
        val => Promise.reject(val),
        err => Promise.resolve(err)
      )
    })
  ).then(
    errors => Promise.reject(errors),
    val => Promise.resolve(val)
  )
}

export const requestCompat = fetch => async config => {
  const { url, headers, method, followRedirect, form } = config
  const options = {
    method,
    redirect: followRedirect ? 'follow' : 'manual',
    headers,
  }
  if (form && method === 'POST') {
    options.body = new URLSearchParams(form)
  }
  const resp = await fetch(url, options)
  const body = await resp.text()
  return {
    request: { headers },
    headers: mapToObj(resp.headers),
    body,
    statusCode:resp.status
  }
}