function getRegistry() {
  let globalNpmrc, localNpmrc, npmrc;
  let token = process.env.NPM_TOKEN

  try {
    globalNpmrc = fs.readFileSync(
      path.join(home, '.npmrc'), { encoding: 'utf8'}
    )
  } catch(err) {}

  try {
    localNpmrc = fs.readFileSync(
      path.join(appRoot.path, '.npmrc'),
      { encoding: 'utf8'}
    )
  } catch(err) {}

  if(
    !globalNpmrc &&
    !localNpmrc
  ) {
    npmrc = '//' + defaultRegistry + '/:_authToken=' + token
    fs.writeFileSync(
      path.join(appRoot.path, '.npmrc'),
      npmrc,
      { encoding: 'utf8'}
    )
    return defaultRegistry
  }

  if(localNpmrc) npmrc = parseNpmrc(localNpmrc)
  else npmrc = parseNpmrc(globalNpmrc)
  let [registry, ...rest] = Object.keys(npmrc.registries)
  return registry;
}