Type error: Property 'pipe' does not exist on type 'ReadableStream<Uint8Array>'

Question

I have this inside an Express.js-like (it's actually Next.js version of something like Express.js) function. The url is a url that ends in .csv, so it is a CSV file download. I'm trying to fetch the CSV and stream the data through the csv-parser library (so I don't have to persist the file) and then finally into an array (I've omitted some of this code, as it is relevant).

export default async (req: NextApiRequest, res: NextApiResponse) => {

  ...

  const response: Response = await fetch(url)
  try {
    response.body.pipe(parser())
      .on('data', callback...)
  } catch {
    error handling...
  }
}

It all works the way I want it, but when I go to build my app I get this error on the response.body.pipe part.

Type error: Property 'pipe' does not exist on type 'ReadableStream<Uint8Array>'.

Hope this is enough context & makes sense. Could anyone advise on how to address this?

Answer 1

I parsed NextApiRequest body like this:

const d = await req.body?.getReader().read();
console.log(d?.value?.toString());