farmOS/modules/core/ui/theme/js/autocomplete.js

(function ($, Drupal) {

  /**
   * Credit: https://borutpiletic.com/article/hide-entity-id-autocomplete-field-widget-drupal-8
   * See Drupal core issue: https://www.drupal.org/project/drupal/issues/2881892
   */

  'use strict';

  /**
   * Remove entity reference ID from "entity_autocomplete" field.
   *
   * @type {{attach: Drupal.behaviors.autocompleteReferenceEntityId.attach}}
   */
  Drupal.behaviors.autocompleteReferenceEntityId = {
    attach: function (context) {

      // Remove reference IDs for autocomplete elements on init.
      $('.form-autocomplete', context).once('replaceReferenceIdOnInit').each(function () {
        let splitValues = (this.value && this.value !== 'false') ?
          Drupal.autocomplete.splitValues(this.value) : [];

        if (splitValues.length > 0) {
          let labelValues = [];
          for (let i in splitValues) {
            let value = splitValues[i].trim();
            let entityIdMatch = value.match(/\s*\((.*?)\)$/);
            if (entityIdMatch) {
              labelValues[i] = value.replace(entityIdMatch[0], '');
            }
          }

          if (labelValues.length > 0) {
            $(this).data('real-value', splitValues.join(', '));
            this.value = labelValues.join(', ');
          }
        }
      });
    }
  };

  let autocomplete = Drupal.autocomplete.options;
  autocomplete.originalValues = [];
  autocomplete.labelValues = [];

  /**
   * Add custom select handler.
   */
  autocomplete.select = function (event, ui) {
    autocomplete.labelValues = Drupal.autocomplete.splitValues(event.target.value);
    autocomplete.labelValues.pop();
    autocomplete.labelValues.push(ui.item.label);
    autocomplete.originalValues.push(ui.item.value);

    $(event.target).data('real-value', autocomplete.originalValues.join(', '));
    event.target.value = autocomplete.labelValues.join(', ');

    return false;
  }

})(jQuery, Drupal);