Better way to return a promise that resolves to a stream in Node JS

I'm stuck somehow, I have something like this in my code:

async function download() {

  const source = createReadStreamSomeHow();

  await pipeline(source, fs.createWriteStream("file.ext"));

  return source;
}

I need to return the readable stream (source) and store it in an array somewhere and at the same time pipe the data from the read stream to "file.ext". But when I call:

let task = await download();
taskArray.add(task);

the pipeline() code pauses execution of the function, hence source is only returned when the data has been completely piped to "file.ext".

Although I understand why the code behaves this way, I can't seem to find a way to return the source stream from the download() function and still pipe the data to "file.ext" at the same time. Is there a better way to achieve this and make it work? Thank for the help in advance.

you can simply drop the async/await

function download() {

  const source = createReadStreamSomeHow();

  pipeline(source, fs.createWriteStream("file.ext"));

  return source;
}

The Promise is still executed, but you have no info when it is done/if it throws.

Or you return the source together with the promise

function download() {
  const source = createReadStreamSomeHow();

  const promise = pipeline(source, fs.createWriteStream("file.ext"));

  return { source, promise }
}

// you can enqueue the source ... 
let task = download();
taskArray.add(task.source);

// ... and handle the promise however you like.
await task.promise;