bricks-2.x-dev/modules/bricks_dynamic/bricks_dynamic.module

<?php

use Drupal\Component\Utility\NestedArray;

/**
 * @file
 * {@inheritdoc}
 */

/**
 * Prepares variables for `field-multiple-value-form.html.twig`.
 */
function bricks_dynamic_preprocess_field_multiple_value_form(&$variables) {
  _bricks_preprocess_tabledrag_form($variables, 'element', 'bricks_tree_dynamic', $variables['element']['#field_name'] . '-delta-order');
}

/**
 * Adds the entity type to the inline entity form element.
 */
function bricks_dynamic_inline_entity_form_reference_form_alter(&$reference_form, $form_state) {
  $triggering_element = $form_state->getTriggeringElement();
  $parents = $triggering_element['#parents'];
  array_pop($parents);
  array_pop($parents);
  $parents[] = 'actions';
  $parents[] = 'entity_type';

  $entity_type = NestedArray::getValue($_POST, $parents);

  $labels = $reference_form['#ief_labels'];
  $ief_id = $reference_form['#ief_id'];
  /** @var \Drupal\field\Entity\FieldConfig $instance */
  $instance = $form_state->get(['inline_entity_form', $ief_id, 'instance']);
  $settings = $instance->getSettings();

  $reference_form['entity_id'] = [
    '#type' => 'entity_autocomplete',
    '#title' => t('@label', ['@label' => ucwords($labels['singular'])]),
    '#target_type' => $entity_type,
    '#selection_handler' => $settings[$entity_type]['handler'],
    '#selection_settings' => $settings[$entity_type]['handler_settings'],
    '#required' => TRUE,
    '#maxlength' => 255,
  ];
}