improvements-2.x-dev/modules/improvements_views/tests/modules/improvements_views_test/improvements_views_test.module

<?php

use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;

/**
 * Implements hook_theme().
 */
function improvements_views_test_theme(): array {
  return [
    'views_view__test_total_rows_token' => [
      'base hook' => 'views_view',
    ],
  ];
}

/**
 * Implements hook_views_data_alter().
 */
function improvements_views_test_views_data_alter(array &$data): void {
  if (isset($data['comment_field_data'])) {
    $data['comment_field_data']['uid_is_registered'] = [
      'title' => t('Author is registered user'),
      'title short' => t('Author is registered user'),
      'real field' => 'uid',
      'sort' => [
        'id' => 'greater_than',
        'number' => 0,
      ],
    ];
  }

  $data['node_field_data']['test_map_field_map'] = [
    'title' => 'Test map field (map)',
    'title short' => 'Test map field (map)',
    'real field' => 'test_map_field',
    'entity field' => 'test_map_field',
    'field' => [
      'id' => 'map',
    ],
  ];
}

/**
 * Implements hook_entity_base_field_info().
 */
function improvements_views_test_entity_base_field_info(EntityTypeInterface $entity_type): ?array {
  if ($entity_type->id() == 'node') {
    $fields = [];

    $fields['test_map_field'] = BaseFieldDefinition::create('map')
      ->setLabel('Test map field');

    return $fields;
  }

  return NULL;
}