class Selenium::WebDriver::Credential

def as_json(*)
  credential_data = {'credentialId' => Credential.encode(id),
                     'isResidentCredential' => resident_credential?,
                     'rpId' => rp_id,
                     'privateKey' => Credential.encode(private_key),
                     'signCount' => sign_count}
  credential_data['userHandle'] = Credential.encode(user_handle) if user_handle
  credential_data
end