download-file.js

(async () => {
  const response = await fetch('<url>', {
    method: 'get',
    headers: {
      'Authorization': 'Bearer <token>'
    }
  });
  const blob = await response.blob();
  const url = URL.createObjectURL(blob);

  const link = document.createElement('a');
  link.download = '<filename>';
  link.href = url;

  link.click();
})();