const readStream = this.storage
      .bucket(bucketName)
      .file(sourceCloudFilename)
      .createReadStream();

    const writeStream = this.storage
      .bucket(bucketName)
      .file(targetCloudFilename)
      .createWriteStream();

const transformStreamSharp = sharp({
      sequentialRead: true,
      failOnError: false,
    })
      .withMetadata()
      .toColorspace('rgb16')
      .png({
        compressionLevel: 5,
      })
      .trim()
      .toBuffer((_err, _buffer, outputInfo) =>
        this.uploadTrimmingInfo(trimInfoCloudFilename, bucketName, outputInfo),
      );
      
      await streamPromises.pipeline(
      readStream,
      transformStreamSharp,
      writeStream,
    );