preserve_advanced_search/preserve_advanced_search.module

<?php

/**
 * @file
 * Preserves advanced search a[] parameters on facet slider URLs.
 */

/**
 * Implements hook_library_info_alter().
 *
 * Attaches the fix-up library as a dependency of the slider widget library
 * rather than to every page. This scopes it to the pages that actually render
 * a slider, and guarantees our script loads first so the behavior is
 * registered — and therefore runs — before the slider reads
 * drupalSettings.facets.sliders.
 */
function preserve_advanced_search_library_info_alter(array &$libraries, $extension)
{
    if ($extension !== 'facets_range_nouislider') {
        return;
    }

    if (isset($libraries['facets_range_nouislider'])) {
        $libraries['facets_range_nouislider']['dependencies'][] = 'preserve_advanced_search/preserve-advanced-search';
    }
}