jQuery(function($){
$(document).on('click','.wvs-swatch-wrap .wvs-swatch',function(){
let $form = $(this).closest('form.variations_form');
let sizeSelect = $form.find('select[name="attribute_size"]');
if(sizeSelect.val()) return;
let firstOption = sizeSelect.find('option:not(:first)').first().val();
if(firstOption){
sizeSelect.val(firstOption).trigger('change');
}
});
});
