node_layout_preview_revision_test.module

<?php
/**
 * @file
 * Node layout preview/revision test module.
 */

/**
 * Implements hook_config_info().
 */
function node_layout_preview_revision_test_config_info() {
  $prefixes['layout.layout.custom_node'] = array(
    'label' => t('Custom Node layout'),
    'group' => t('Layouts'),
  );
  $prefixes['layout.layout.custom_node_preview'] = array(
    'label' => t('Custom Node Preview layout'),
    'group' => t('Layouts'),
  );
  $prefixes['layout.layout.custom_node_revision'] = array(
    'label' => t('Custom Node Revision layout'),
    'group' => t('Layouts'),
  );
  return $prefixes;
}