How to use the qrcode.toFileStream function in qrcode

app.get('/qr/:data', (req, res) =>
    qrcode.toFileStream(res.type('png'), req.params.data))

app.get('/checkout/:invoice/qr.png', wrap(async (req, res) => {
    qrcode.toFileStream(res.type('png'), `lightning:${req.invoice.payreq}`.toUpperCase())
  }))
}

function writeQRCodeToStream(text, stream) {
    qrcode.toFileStream(stream, text, options);
}