Get access to S3 upload response

[dorsett85]

Support plan

• which support plan is this issue covered by? (e.g. Community, Sponsor, or
  Enterprise): community
• is this issue currently blocking your project? (yes/no): no
• is this issue affecting a production system? (yes/no): no

Context

• node version: 22.11.0
• module (formidable) version: 3.5.2
• environment (e.g. node, browser, native, OS): node
• used with (i.e. popular names of modules): @aws-sdk/client-s3, @aws-sdk/lib-storage
• any other relevant information:

What problem are you trying to solve?

Using this example from the docs, I'd like to be able to get the return value of the s3.upload call to store some data in a db record. I'm using the newer aws client libs (@aws-sdk/client-s3 and @aws-sdk/lib-storage), but it is basically the same thing as the example link. The following snippet shows where I'm trying to access the data:

const form = formidable({
  keepExtensions: true,
  fileWriteStreamHandler: (file) => {
    const pass = new PassThrough();
    if (!(file instanceof VolatileFile)) {
      return pass;
    }

    // This promise returns data I'd like to use after the parse call below
    new Upload({
      client: s3Client,
      params: {
        Bucket: 'BUCKET_NAME',
        Key: file.newFilename,
        Body: pass,
      },
    }).done();

    return pass;
  },
});

const files = (await form.parse(req))[1];

// Do something with files and return value of `new Upload` above