How to wait for all uploads to finish before returning

[EvHaus]

I can't figure out how to get formidable to wait until all the uploads are done before returning a response. Specifically I am using S3 for handling uploads, and following the example code here: https://github.com/node-formidable/formidable/blob/master/examples/store-files-on-s3.js

How do I only return a response once all the files have successfully gone through the fileWriteStreamHandler? There doesn't seem to be any support for Promises nor callbacks in there.

I was expecting something like this:

const uploadStream = (file) => {
  const pass = new PassThrough();
  s3Client.upload(
    {
      Bucket: 'demo-bucket',
      Key: file.newFilename,
      Body: pass,
    },
    (err, data) => {
      // I want to add something here to capture the response and also tell formidable not to exit
      // until we get here.
    },
  );

  return pass;
};

const server = http.createServer((req, res) => {
    const form = formidable({
      fileWriteStreamHandler: uploadStream,
    });

    form.parse(req, () => {
      // I only want this to fire once all the files have completed uploading to S3. Ideally
      // I also want to access the results from the S3 upload as well so I can include the S3
      // response data in the endpoint return response
      res.writeHead(200);
      res.end();
    });
});

[GrosSacASac]

proimisy the s3Client.upload function, store the promise in a variable, push the variable in an array, then
use await Promise.all(promises)

[EvHaus]

Thanks for the response. It's not the cleanest solution but it will do the trick. :)