How to expose custom webform fields to GraphQL?

I would like to use https://www.drupal.org/project/captcha with Webforms. For exposing Webforms via GraphQL I use https://github.com/duartegarin/graphql_webform.

As CAPTCHA is not a standard field https://github.com/duartegarin/graphql_webform does not expose it via GraphQL. As I did not find any documentation on how to expose custom webform fields to GraphQL I thought I ask about it here.

Thank you.

The CAPTCHA module doesn't implement a webform component. It just adds a form element to the forms for which it has been configured to add its CAPTCHA.

If the CAPTCHA module implemented a webform component, then implementing a few classes (starting from a plugin like WebformElementPhone) would allow to integrate the modules together.

/**
 * A GraphQL type for textfield form item.
 *
 * @GraphQLType(
 *   id = "webform_element_phone",
 *   name = "WebformElementPhone",
 *   interfaces = {"WebformElementTextBase"},
 * )
 */
class WebformElementPhone extends TypePluginBase {

  /**
   * {@inheritdoc}
   */
  public function applies($object, ResolveContext $context, ResolveInfo $info) {
    return $object['plugin'] instanceof Telephone;
  }

}