Buffer File to store as a Pdf into Google Cloud storage

If I need to store a a pdf to google cloud storage, the below code works fine.
```
var {Storage} = require('@google-cloud/storage');
const gcs = new Storage({
projectId: 'projectId',
keyFilename: 'xyz.json'
});
const bucket = gcs.bucket('projectId');
var localReadStream = fs.createReadStream('path/to/new.pdf');
var Pdf = bucket.file('newFile.pdf');

localReadStream.pipe(Pdf.createWriteStream({
metadata: {
contentType: 'application/pdf',
metadata: {
custom: 'metadata'
}
}
}))
```
But I do have a buffer object of this file pdf file as ` {
// Something
});
```

But not able to figure it out how to do the pipe operation. Any help would be appreciated.