class ConfigUpdateSubscriber

class ConfigUpdateSubscriber implements EventSubscriberInterface {
    
    /**
     * Constructs an object.
     *
     * @param \Drupal\Core\Config\ConfigCrudEvent $event
     *   The configuration event.
     */
    public function onConfigSave(ConfigCrudEvent $event) {
        if (!class_exists(DeprecationHelper::class)) {
            return;
        }
        $saved_config = $event->getConfig();
        // The revision field type of `block_content.type.*` is updated to boolean
        // from Drupal Core 10.3.x. So, we are updating the configuration
        // `block_content.type.basic` at runtime, so that `ConfigSchemaChecker`
        // event doesn't throw exceptions in Drupal 10.3.x and above.
        // @see https://www.drupal.org/i/3397493
        if ($saved_config->getName() == "block_content.type.basic") {
            if (\version_compare(\Drupal::VERSION, '10.3', '>=')) {
                $saved_config->set("revision", (bool) $saved_config->get("revision"));
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() {
        // The priority is set as 256, so that this event is called before the
        // `ConfigSchemaChecker` event.
        // @see \Drupal\Core\Config\Development\ConfigSchemaChecker
        $events[ConfigEvents::SAVE][] = [
            'onConfigSave',
            256,
        ];
        return $events;
    }

}