class SimpleConfigUpdate

final class SimpleConfigUpdate implements ConfigActionPluginInterface, ContainerFactoryPluginInterface {
    
    /**
     * Constructs a SimpleConfigUpdate object.
     *
     * @param \Drupal\Core\Config\ConfigFactoryInterface $configFactory
     *   The config factory.
     */
    public function __construct(ConfigFactoryInterface $configFactory) {
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
        return new static($container->get('config.factory'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function apply(string $configName, mixed $value) : void {
        $config = $this->configFactory
            ->getEditable($configName);
        // @todo https://www.drupal.org/i/3439713 Should we error if this is a
        //   config entity?
        if ($config->isNew()) {
            throw new ConfigActionException(sprintf('Config %s does not exist so can not be updated', $configName));
        }
        // Expect $value to be an array whose keys are the config keys to update.
        if (!is_array($value)) {
            throw new ConfigActionException(sprintf('Config %s can not be updated because $value is not an array', $configName));
        }
        foreach ($value as $key => $value) {
            $config->set($key, $value);
        }
        $config->save();
    }

}