...Synchronicity for unique file names is killing me.

I'm having a hard time, with the not being able to perform any async operation before: res.onData while receiving a post.

I'm setting up a file upload server, and I need to get a unique filename for my stream in an async way, there's just too much concurrency to do it any other way, is this really not feasible? :(

If I perform an async operation to get fileName, then res.onData just won't perform its callback, like there's nothing there.

const fileName = 'jesusChrist';let writeStream = fs.createWriteStream(fileName); await new Promise((resolve, reject) => {    const timeout = setTimeout(reject, 60 * 1000);    writeStream.on('error', reject);    let byteSize = 0;      res.onData((chunk, isLast) => {        byteSize += chunk.byteLength;        console.log('byteSize', byteSize);        writeStream.write(Buffer.from(chunk.slice(0)));        isLast && resolve() && clearTimeout(timeout);      });  });`