MediaWiki:Common.js

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// Initialize PhotoSwipe
mw.loader.using(['ext.photoSwipe'], function() {
    var config = mw.config.get('wgPhotoSwipeConfig');
    if (!config) {
        // Default configuration if none exists
        config = {
            mode: 'recommended',
            options: {
                gallery: 'table.gallery',
                children: 'a.img',
                thumbSelector: 'a.img',
                allowPanToNext: false,
                wheelToZoom: true
            }
        };
        mw.config.set('wgPhotoSwipeConfig', config);
    }
});