How to use stream-to-array

async onResponse (req, reply, res) {
    const buffer = Buffer.concat(await toArray(res))
    const payload = JSON.parse(buffer.toString())
    payload.newProperty = 'new value'

    reply.header('Content-Length', 0).send(payload)
   }

Promise.all(
   files.map(async stream => {
    const parts = await toArray(fs.createReadStream(stream.path));
    const buffers = parts.map(
     part => (_.isBuffer(part) ? part : Buffer.from(part)),
    );

    const buffer = Buffer.concat(buffers);

    return {
     tmpPath: stream.path,
     name: stream.name,
     sha256: niceHash(buffer),
     hash: uuid().replace(/-/g, ''),
     ext:
      stream.name.split('.').length > 1
       ? `.${_.last(stream.name.split('.'))}`
       : '',
     buffer,
     mime: stream.type,
     size: (stream.size / 1000).toFixed(2),
    };
   }),
  )