Function normalize

src/utils/join.js:88–124

(path)

}

function normalize(path) {
  if (!path.length) return '.'

  // Normalise backslashes to forward slashes before any other processing.
  path = path.replace(/\\/g, '/')

  const drivePrefix = getWindowsDrivePrefix(path)
  // isAbsolute: Unix root ('/foo') OR Windows drive+slash ('C:/foo').
  const isAbsolute =
    path[0] === '/' || (drivePrefix !== null && path[2] === '/')
  const trailingSeparator = path.at(-1) === '/'

  // Strip the drive prefix before feeding into normalizeString so that the
  // core algorithm only ever sees a plain POSIX-style string.
  const pathBody = drivePrefix ? path.slice(2) : path

  let normalized = normalizeString(pathBody, !isAbsolute)

  if (!normalized.length) {
    const root = drivePrefix
      ? isAbsolute
        ? drivePrefix + '/'
        : drivePrefix
      : isAbsolute
        ? '/'
        : '.'
    return trailingSeparator && !isAbsolute ? root + '/' : root
  }
  if (trailingSeparator) normalized += '/'

  if (drivePrefix) {
    return isAbsolute
      ? `${drivePrefix}/${normalized}`
      : `${drivePrefix}${normalized}`
  }
  return isAbsolute ? `/${normalized}` : normalized
}

export function join(...args) {
  if (args.length === 0) return '.'