Function formatUrl

packages/next/src/shared/lib/router/utils/format-url.ts:29–73

(urlObj: UrlObject)

const slashedProtocols = /https?|ftp|gopher|file/

export function formatUrl(urlObj: UrlObject) {
  let { auth, hostname } = urlObj
  let protocol = urlObj.protocol || ''
  let pathname = urlObj.pathname || ''
  let hash = urlObj.hash || ''
  let query = urlObj.query || ''
  let host: string | false = false

  auth = auth ? encodeURIComponent(auth).replace(/%3A/i, ':') + '@' : ''

  if (urlObj.host) {
    host = auth + urlObj.host
  } else if (hostname) {
    host = auth + (~hostname.indexOf(':') ? `[${hostname}]` : hostname)
    if (urlObj.port) {
      host += ':' + urlObj.port
    }
  }

  if (query && typeof query === 'object') {
    query = String(querystring.urlQueryToSearchParams(query as ParsedUrlQuery))
  }

  let search = urlObj.search || (query && `?${query}`) || ''

  if (protocol && !protocol.endsWith(':')) protocol += ':'

  if (
    urlObj.slashes ||
    ((!protocol || slashedProtocols.test(protocol)) && host !== false)
  ) {
    host = '//' + (host || '')
    if (pathname && pathname[0] !== '/') pathname = '/' + pathname
  } else if (!host) {
    host = ''
  }

  if (hash && hash[0] !== '#') hash = '#' + hash
  if (search && search[0] !== '?') search = '?' + search

  pathname = pathname.replace(/[?#]/g, encodeURIComponent)
  search = search.replace('#', '%23')

  return `${protocol}${host}${pathname}${search}${hash}`
}

export const urlObjectKeys = [
  'auth',