How to use the frida-fs.createReadStream function in frida-fs

if (opt.verbose)
        console.log('compress:', relative)

      const entry = libarchive.entryNew()
      libarchive.entrySetPathname(entry, Memory.allocUtf8String(path.join(prefix, relative)))
      libarchive.entrySetSize(entry, st.size)
      libarchive.entrySetFiletype(entry, fs.constants.S_IFREG)
      libarchive.entrySetPerm(entry, st.mode & 0o777)
      libarchive.entrySetCtime(entry, timestamp(st.ctime), 0)
      libarchive.entrySetMtime(entry, timestamp(st.mtime), 0)
      libarchive.writeHeader(ar, entry)

      const filename = relative in lookup ? lookup[relative].decrypted : absolute
      let stream
      try {
        stream = fs.createReadStream(filename, { highWaterMark })
      } catch (e) {
        if (!/(\/Plugins\/(.*)\.appex\/)?SC_Info\//.test(relative))
          console.warn(`unable to open ${filename} (${e.message})`)
        continue
      }

      await new Promise((resolve, reject) =>
        stream
          .on('data', chunk => {
            Memory.writeByteArray(buf, chunk)
            libarchive.writeData(ar, buf, chunk.byteLength)
          })
          .on('end', resolve)
          .on('error', reject))

      // delete decrypted file

async function transfer(filename) {
  const session = Math.random().toString(36).substr(2)
  const highWaterMark = 4 * 1024 * 1024
  const subject = 'download'
  const { size } = fs.statSync(filename)
  const stream = fs.createReadStream(filename, { highWaterMark })

  console.log('start transfering')
  send({
    subject,
    event: 'start',
    session,
    size,
  })

  const format = size => `${(size / 1024 / 1024).toFixed(2)}MiB`

  let sent = 0
  await new Promise((resolve, reject) =>
    stream
      .on('data', chunk => {
        send({