script.js

require(['jquery'], function($) {
    require(['lightgallery'], function(lightgallery) {
        require(['lg-thumbnail', 'lg-autoplay', 'lg-video', 'lg-fullscreen', 'lg-pager', 'lg-zoom', 'lg-hash', 'lg-share'], function(lgthumbnail, lgautoplay, lgvideo, lgfullscreen, lgpager, lgzoom, lghash, lgshare) {
            $(document).ready(function() {
            initLightGallery();
            });
            $(window).on('action:topic.loaded', function(data) {
            initLightGallery();
            });
            function initLightGallery() {
            $("[id^=lightgallery]").lightGallery({
                exThumbImage: 'data-exthumbimage',
                selector: 'a > img'
            });
            }
        });
    });
});