ufs.createWriteStream(path) results in Error: ENOENT: no such file or directory, stat

[WinstonN]

Hi,
I'm trying to create a file, which I want to stream a 115MB file from S3 into but failing horribly. Could you please help me in the right direction?

My code looks like this
The directory does exist and is writable
ufs looks like

ufs
    .use(vol)
    .use(fs)

console.log('test createwritestream ufs')
ufs.createWriteStream('/tmp/ufs.tgz')
if(ufs.existsSync('/tmp/ufs.tgz')) {
  console.log('/tmp/ufs.tgz create success')
}
else {
  console.log('/tmp/ufs.tgz create failed')
}

console.log('test createwritestream fs')
fs.createWriteStream('/tmp/fs.tgz')
if(fs.existsSync('/tmp/fs.tgz')) {
  console.log('/tmp/fs.tgz create success')
}
else {
  console.log('/tmp/ufs.tgz create failed')
}

The result is

2019-12-20T06:49:43.334Z	b1d017eb-a1ea-49d4-8339-c30d07f779a1	INFO	{ Error: ENOENT: no such file or directory, stat '/tmp/ufs.tgz'
    at Object.statSync (fs.js:855:3)
    at Union.createWriteStream (/var/task/node_modules/unionfs/lib/union.js:340:28)
    at Promise (/var/task/src/global/run.js:200:13)
    at new Promise (<anonymous>)
    at downloadFileFromS3 (/var/task/src/global/run.js:181:12)
    at Runtime.module.exports.execute [as handler] (/var/task/src/global/run.js:278:9)
  errno: -2,
  syscall: 'stat',
  code: 'ENOENT',
  path: '/tmp/ufs.tgz' }

The version I am using is:

"unionfs": {
      "version": "4.2.1",
      "resolved": "https://registry.npmjs.org/unionfs/-/unionfs-4.2.1.tgz",
      "integrity": "sha512-QvdUyG3+m3Nh8YQfCV1mzOvBp7izXoEpGMZzqupKrzFY7cWuayKr8JRdN7CwNcNVjXYR2AZBeY+hStPKFUAT+w==",
      "requires": {
        "fs-monkey": "^0.3.3"
      }
    },

Thanks!

[WinstonN]

nvm
I got this right, by writing the code differently

Using the below works

s3.getObject(params, function(error, data) {
    vol.writeFile(`${ramDisk}/tmp/${fileName}`, data.Body, function(error) {
      // do error checking / validation
    })
})