group_role_condition.module

<?php

/**
 * @file
 * Contains group_role_condition.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_help().
 */
function group_role_condition_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the group_role_condition module.
    case 'help.page.group_role_condition':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Provides a Condition plugin which checks to see if user group role matches selection') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * @param array $form
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 * @param string $form_id
 */
function group_role_condition_form_block_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (isset($form['visibility']['group_role'])) {
//    $form['visibility_tabs']['#attached']['library'][] = 'group_role_condition/block';
    $form['visibility']['group_role']['#title'] = t('Group roles');
    $form['visibility']['group_role']['negate']['#type'] = 'value';
    $form['visibility']['group_role']['negate']['#title_display'] = 'invisible';
    $form['visibility']['group_role']['negate']['#value'] = $form['visibility']['group_role']['negate']['#default_value'];
  }
}