Composite Function in Google Cloud Service

[Oculus049]

Hi, I'm trying to perform a composite operation on an image that I am sending through a stream in GCS. I've already done some prior research on this, I'm aware that the composite function doesn't support streams as an input via issue #2200.

I'm considering, as a solution, converting my file input to a raw image buffer that can be read by the composite function before then turning it into a read stream that I can then send through the render output, performing any extra image transformations that I'd like to then. Any ideas on how I would go about doing that?

// Transformer sets the file attributes based on prior queries
  const transformer = sharp()
    .resize(resize)
    .modulate({
    brightness: brightnessVal
    })
    .toFormat(ext);

  // Loads the pictures from bucket
  const gcs = new Storage();
  let fileOne = gcs.bucket('bucketName').file(imageOneParameters.fileName);
  let fileTwo = gcs.bucket('bucketName').file(imageTwoParameters.fileName);

  //v DO THE COMPOSITE HERE? v
  // fileOne + fileTwo = compositeFile ???

  // Create a stream
  let stream = compositeFile.createReadStream()
  stream.on('error', function(err) {
    console.error(err);
    res.sendStatus(err.code).end(err);
  });

  // Add headers
  res.setHeader("content-type", "image/"+ext);
  res.setHeader("cache-control", "public, max-age=31536000, immutable");

  // Render
  stream.pipe(transformer).pipe(res);
});