Permissions.php

<?php

namespace Drupal\paragraphs_collection;

use Drupal\Core\StringTranslation\StringTranslationTrait;

/**
 * Defines a class containing permission callbacks.
 */
class Permissions {
  use StringTranslationTrait;

  /**
   * Returns an array of permissions for advanced styles.
   *
   * @return array
   */
  public function permissions() {
    $permissions = [];

    /** @var \Drupal\paragraphs_collection\StyleDiscoveryInterface $style_discovery */
    $style_discovery = \Drupal::service('paragraphs_collection.style_discovery');

    // Generate permissions for advanced behavior styles.
    foreach ($style_discovery
      ->getStyles() as $style) {
      if (isset($style['permission']) && $style['permission'] === TRUE) {
        $permissions['use ' . $style['name'] . ' style'] = [
          'title' => $this
            ->t('Use %style style', [
            '%style' => $style['title'],
          ]),
          'description' => $this
            ->t('Users with this permission can use %style behavior style.', [
            '%style' => $style['title'],
          ]),
        ];
      }
    }
    return $permissions;
  }

}