FormData using BusBoy for firebase works in serve but not in deploy - firebase

Question

Situation
I have a firebase function that updates the user image.
Problem
When I run locally my function using firebase serve, I successfully upload the image to firestore using Postman. However, when I run firebase deploy and I try to upload the image using Postman, I get a 500 Internal Server Error. The other functions (not dealing with FormData, just json) work perfectly when I deploy them.
I don't understand why it works locally, but not on deploy when I am doing the exact same thing. Not sure if this is something in the config I am missing, or if I am doing something wrong. Any help would be appreciated!
Code
users.js
const { admin, db, firebase } = require('../util/admin');
const config = require('../util/config');
exports.postUserImage = (req, res) => {
const BusBoy = require('busboy');
const path = require('path');
const os = require('os');
const fs = require('fs');
let imgFileName;
let imgToBeUploaded = {};
const busboy = new BusBoy({ headers: req.headers });
busboy.on('file', (fieldname, file, filename, encoding, mimetype) => {
// Invalid file type
if (mimetype !== 'image/jpeg' && mimetype !== 'image/png') {
return res.status(400).json({ error: 'Invalid file type' });
}
// Extract img extension
const imgDotLength = filename.split('.').length;
const imgExtension = filename.split('.')[imgDotLength - 1];
// Create img file name
imgFileName = `${Math.round(Math.random() * 1000000)}.${imgExtension}`;
// Create img path
const filepath = path.join(os.tmpdir(), imgFileName);
// Create img object to be uploaded
imgToBeUploaded = { filepath, mimetype };
// Use file system to create the file
file.pipe(fs.createWriteStream(filepath));
});
busboy.on('finish', () => {
admin
.storage()
.bucket()
.upload(imgToBeUploaded.filepath, {
resumable: false,
metadata: {
metadata: {
contentType: imgToBeUploaded.mimetype
}
}
})
.then(() => {
// Create img url to add to our user
const imgUrl = `https://firebasestorage.googleapis.com/v0/b/${config.storageBucket}/o/${imgFileName}?alt=media`;
// Add img url to user document
return db.doc(`/users/${req.user.handle}`).update({ imgUrl });
})
.then(() => {
return res.json({ message: 'Image uploaded succesfully' });
})
.catch((err) => {
console.error(err);
return res.status(500).json({ error });
});
});
busboy.end(req.rawBody);
};
index.js
const { app, functions } = require('./util/admin');
const FirebaseAuth = require('./util/firebaseAuth');
const {
postUserImage,
} = require('./handlers/users');
app.post('/user/image', FirebaseAuth, postUserImage);