id: no-flask-sendfile-without-mimetype
valid:
  - 'return send_file("file.pdf", mimetype="application/pdf")'
  - 'return send_file("file.bin", download_name="report.bin")'
  - 'return send_file("file.bin", as_attachment=True, mimetype="application/octet-stream")'
invalid:
  - 'return send_file("file.pdf")'
  - 'return send_file("file.bin", as_attachment=True)'