Does backpressure is handled in split2 as its is resulting for me in heap memory limit error

Below code snippet is resulting into heap memory exhaustion.

try {
  const downloadedFile = this._s3client.getObject(params) 
  const userStream: Readable = await downloadedFile.createReadStream()

  for await (const userId of pipeline(userStream, split2(), piplineCallback)) {
    console.log(userId)
  }

} catch (error) {
  console.log('Error should be caught here.')
  throw error
}

const piplineCallback = (err) => {
  if (err) {
    logger.error({ exception: err }, 'Error occured in splitted userstream pipeline.')
    throw new InternalServerError(err)
  } else {
    logger.debug('Userstream pipeline succeded.')
  }
}

This code results into following error:

"FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory\n"

I am using node.js v12.x
Do I need to handle backpressure explicity here somehow?

Start with the reported Node.js v12 snippet, especially split2(), pipeline(), and the S3 createReadStream() source. Reproduce the heap exhaustion and inspect the stream/backpressure behavior; done means establishing whether split2 is responsible and documenting the required handling or a confirmed defect.