const fetch = process.server ? require('node-fetch/lib/index.js') : require('node-fetch/browser.js')

const AbortController = require('abort-controller')

const TEN_MEGABYTES = 1000 * 1000 * 10

if (!global.fetch) {
  global.fetch = (url, options) => fetch(url, { highWaterMark: TEN_MEGABYTES, ...options })
}

if (!global.Headers) {
  global.Headers = fetch.Headers
}

if (!global.Request) {
  global.Request = fetch.Request
}

if (!global.Response) {
  global.Response = fetch.Response
}

if (!global.AbortController) {
  global.AbortController = AbortController
}

if (!global.ReadableStream) {
  try {
    global.ReadableStream = require('web-streams-polyfill/ponyfill/es2018')
  } catch (_) { }
}

module.exports = require('ky/umd')