SuperUserAccessPolicy.php

<?php

declare (strict_types=1);
namespace Drupal\Core\Session;

use Drupal\Core\Cache\CacheOptionalInterface;

/**
 * Grants user 1 an all access pass.
 */
final class SuperUserAccessPolicy extends AccessPolicyBase implements CacheOptionalInterface {
  
  /**
   * {@inheritdoc}
   */
  public function calculatePermissions(AccountInterface $account, string $scope) : RefinableCalculatedPermissionsInterface {
    $calculated_permissions = parent::calculatePermissions($account, $scope);
    if ((int) $account->id() !== 1) {
      return $calculated_permissions;
    }
    return $calculated_permissions->addItem(new CalculatedPermissionsItem([], TRUE));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getPersistentCacheContexts() : array {
    return [
      'user.is_super_user',
    ];
  }

}