class RequiredModuleUninstallValidator

class RequiredModuleUninstallValidator implements ModuleUninstallValidatorInterface {
  use StringTranslationTrait;
  
  /**
   * The module extension list.
   *
   * @var \Drupal\Core\Extension\ModuleExtensionList
   */
  protected $moduleExtensionList;
  
  /**
   * Constructs a new RequiredModuleUninstallValidator.
   *
   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
   *   The string translation service.
   * @param \Drupal\Core\Extension\ModuleExtensionList $extension_list_module
   *   The module extension list.
   */
  public function __construct(TranslationInterface $string_translation, ModuleExtensionList $extension_list_module) {
    $this->stringTranslation = $string_translation;
    $this->moduleExtensionList = $extension_list_module;
  }
  
  /**
   * {@inheritdoc}
   */
  public function validate($module) {
    $reasons = [];
    $module_info = $this->getModuleInfoByModule($module);
    if (!empty($module_info['required'])) {
      $reasons[] = $this->t('The @module module is required', [
        '@module' => $module_info['name'],
      ]);
    }
    return $reasons;
  }
  
  /**
   * Returns the module info for a specific module.
   *
   * @param string $module
   *   The name of the module.
   *
   * @return array
   *   The module info, or empty array if that module does not exist.
   */
  protected function getModuleInfoByModule($module) {
    if ($this->moduleExtensionList
      ->exists($module)) {
      return $this->moduleExtensionList
        ->get($module)->info;
    }
    return [];
  }

}