JavaScript Manipulate GridFS file with GraphicsMagick and store it as new file

I'm trying to read a GridFS file via gridfs-stream (https://github.com/aheckmann/gridfs-stream), rotate it 90° with gm and store it as a new GridFS file.

My result looks very 'unstylish'... So I'm asking for help to optimize this little code snippet...

And the second thing for this code: I need a kind of 'switch'. This code do a rotation manipulation of the image. But I need to pass a parameter to do rotation, resize or something else. How do I integrate this?

import Grid from 'gridfs-stream'
import { MongoInternals } from 'meteor/mongo'

const id = '12345'
const gfs = Grid(
  MongoInternals.defaultRemoteCollectionDriver().mongo.db,
  MongoInternals.NpmModule
)

const readStream = gfs.createReadStream({ _id: id })
readStream.on('error', function (err) {
  console.error('Could not read stream', err)
  throw Meteor.Error(err)
})

gm(readStream)
  .rotate('#ffffff', 90)
  .stream(function (err, stdout, stderr) {
    if (err) {
      console.error('Could not write stream')
      throw Meteor.Error(err)
    }
    const writeStream = gfs.createWriteStream()
    const newFileId = writeStream.id
    writeStream.on('finish',
      function () {
        console.log('New file created with ID ' + newFileId)
      }
    )
    stdout.pipe(writeStream)
  })
Answer:1

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