_block_rehash example

function hook_rebuild() {
  $themes = \Drupal::service('theme_handler')->listInfo();
  foreach ($themes as $theme) {
    _block_rehash($theme->getName());
  }
}

/** * Alter the configuration synchronization steps. * * @param array $sync_steps * A one-dimensional array of \Drupal\Core\Config\ConfigImporter method names * or callables that are invoked to complete the import, in the order that * they will be processed. Each callable item defined in $sync_steps should * either be a global function or a public static method. The callable should * accept a $context array by reference. For example: * @code * function _additional_configuration_step(&$context) { * // Do stuff. * // If finished set $context['finished'] = 1. * } * @endcode * For more information on creating batches, see the * @link batch Batch operations @endlink documentation. * * @see callback_batch_operation() * @see \Drupal\Core\Config\ConfigImporter::initialize() */