Getting a file from bucket as a stream

firebase-download-file.ts

import * as admin from 'firebase-admin';
admin.initializeApp({
   credential: admin.credential.applicationDefault()
});
exports.downloadFile = httpRequest.onRequest((req, res) => {
  const bucket = admin.storage().bucket('my_bucket');                   // initialize storage as admin
  const stream = bucket.file('path/to/file.jpg').createReadStream();    // create stream of the file in bucket
  
  // pipe stream on 'end' event to the response
  return stream
    .on('end', (data: any) => {})
    .pipie(res);
});