How to use aproba - 6 common examples

export function unpack (archivePath, progressGroups, targetPath) {
  validate('SOS', arguments)

  const name = basename(archivePath)
  let gauge = progressGroups.get(name)
  if (!gauge) {
    gauge = log.newGroup(name)
    progressGroups.set(name, gauge)
  }

  const unpacked = join(targetPath, createHash('sha1').update(archivePath).digest('hex'))

  return Bluebird.join(
    mkdirp(unpacked),
    stat(archivePath)
  ).spread((p, stats) => new Bluebird((resolve, reject) => {
    gauge.verbose('unzip', 'unpacking', archivePath, 'to', unpacked)
    // openZip can't be promisified because the object stream it yields doesn't

export default function transcode (track, destination, encoder, profile) {
  validate('OSSS', arguments)

  // ensure we've been given a FLAC
  if (extname(track.file.path) !== '.flac') {
    throw new TypeError('Transcode only FLAC files, for now.')
  }

  const working = join(destination, fingerprint64(basename(track.file.path, '.flac')) + '.mp3')
  const final = join(destination, basename(track.file.path, '.flac') + '.mp3')

  const runTranscode = Bluebird.all([which('flac'), which(encoder)]).then(([flac, encoder]) => {
    log.silly('transcode', 'flac binary lives at', flac)
    log.verbose('transcode', 'encoder binary lives at', encoder)

    // ensure destination exists
    mkdirp(destination).then(() => {
      // then run a streaming transcode

export default function validateGenreTag (track, warnings) {
  validate('OA', arguments)
  if (track.tags && track.tags.genre) {
    const genre = track.tags.genre
    if (!genres.has(genre)) {
      warnings.push('has unknown genre ' + genre)
    }

    if (genre.match(/^[ A-Z/-]+$/) && !genres.has(genre)) {
      warnings.push('has all-caps genre ' + genre)
    }
  } else {
    warnings.push('has no genre set')
  }
}

function toUncompressedFile (md, path, onFinish, onError) {
    validate('OSFF', arguments)

    gauge.silly('unzip.toUncompressedFile', 'writing', path, '(' + md.uncompressedSize + 'B)')

    const filename = basename(md.fileName)
    const writeGauge = progressGroups.get(filename).newStream(
      'writing: ' + path,
      md.uncompressedSize,
      3
    ).on('error', onError)

    const extracted = createWriteStream(path)
      .on('error', onError)
      .on('finish', () => {
        gauge.verbose('unzip.toUncompressedFile', 'wrote', path)
        onFinish({ path })
      })

export default function blockSizeFromPath (path) {
  validate('S', arguments)

  const base = resolve(path)
  const probe = join(
    base,
    'packzzz-test-' + pseudoRandomBytes(4).toString('hex')
  )
  return mkdirp(base)
    .then(() => writeFile(probe, 'lol'))
    .then(() => stat(probe))
    .then((stats) => rimraf(probe).return(stats.blksize))
}

function toMetadataReader (md, path, onFinish, onError) {
    validate('OSFF', arguments)

    const zipStats = {
      size: md.uncompressedSize,
      atime: md.getLastModDate(),
      mtime: md.getLastModDate(),
      ctime: md.getLastModDate(),
      birthtime: md.getLastModDate(),
      uid: process.getuid(),
      gid: process.getgid()
    }

    return reader(
      { path: path, stats: zipStats },
      progressGroups,
      onFinish,
      onError