/**
* Add a new permission.
*
* @param string $permissionName The name of the permission.
* @param text $description The description of the permission.
* @return void
**/
public function addPermission($permissionName, $description)
{
if (!$this->permissions->exists($permissionName, true)) {
return $this->permissions->addPermission($permissionName, $description);
}
throw new \InvalidArgumentException("Permission doesn't exist or is soft-deleted");
}