SuperUserAccessPolicy.php

<?php

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


/**
 * Grants user 1 an all access pass.
 */
class SuperUserAccessPolicy extends AccessPolicyBase {

  /**
   * {@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',
    ];
  }

}