https://api.drupal.org/api/drupal/core%21modules%21user%21src%21RoleInterface.php/8.9.x
RoleInterface.php | Drupal API
phpdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21user%21src%21RoleInterface.php/function/RoleInterface%3A%3AsetWeight/10
function RoleInterface::setWeight | Drupal API
functiondrupalapi