Add “nofollow” to external links

<?php

add_action( 'wp_head', function() {
?>

<script>
(function($) {
    const isExternalURL = (url) => new URL(url).origin !== location.origin;

    document.addEventListener('facetwp-loaded', function() {
        $('.facetwp-template a').each(function() {
            var $this = $(this);
            if (isExternalURL($this.attr('href'))) {
                $this.attr('rel', 'nofollow');
            }
        });
     });
})(jQuery);
</script>

<?php
}, 100 );