content_export_yaml-8.x-2.9/content_export_yaml.module

<?php

/**
 * @file
 * Contains content_export.module.
 */
use Drupal\Core\Routing\RouteMatchInterface;
/**
 * Implements hook_help().
 */
function content_export_yaml_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the content_export module.
    case 'help.page.content_export_yaml':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Export and Import Content Using YAML file') . '</p>';
      return $output;

    default:
  }
}
//function content_export_yaml_preprocess_page($var) {
//  $export = \Drupal::service('content_export_yaml.manager');
//  /**Default**/
//  $result  = $export->importBlockAll('basic');    // required param block type
//  $result  = $export->importNode(1,'article');    // required param id , type
//  $result  = $export->exportTerm(1);  // required param id
//  /**Custom Path **/
//  $options['path'] = '/sites/default/files/export';
//  $result  = $export->importBlockAll('basic',$options);
//  $result  = $export->exportTermAll('tags',$options);
//  $result  = $export->exportNode(1,$options);
//}

/**
 * Implements hook_theme().
 */
function content_export_yaml_theme() {
  $theme = [];
  $theme['view_template_item'] = [
    'variables' => [
        'item' => []
      ]
  ];

  return $theme;
}