degov-8.x-2.0/modules/degov_paragraph_map/degov_paragraph_map.module

<?php

use Drupal\Core\Form\FormStateInterface;
use Drupal\degov_common\Common;

/**
 * Implements hook_preprocess().
 */
function degov_paragraph_map_preprocess(&$variables, $hook, &$info) {
  // Add template suggestions and libraries implemented in this module.
  Common::addThemeSuggestions($variables, $hook, $info, [
    'module_name' => 'degov_paragraph_map',
    'entity_type' => 'paragraph',
    'entity_bundles' => ['map'],
    'entity_view_modes' => ['default', 'preview'],
  ]);
}

/**
 * Implements hook_field_widget_form_alter().
 */
function degov_paragraph_map_field_widget_form_alter(&$element, FormStateInterface $form_state, $context) {
  /** @var \Drupal\Core\Field\WidgetBase $widget */
  $widget = $context['widget'];

  // Limit the view mode selection field to the selected view modes.
  if ($widget->getPluginId() == 'entity_reference_paragraphs' && !empty($element['subform']['field_map_address_view_mode'])) {
    $allowed_view_modes = [
      'osm_map' => t('OSM Map'),
      'default_map' => t('Google Map'),
    ];
    $element['subform']['field_map_address_view_mode']['widget']['#options'] = $allowed_view_modes;
  }
}