check if plugin is ready

pluginCheck.js

// Check if plugin is ready to call
function checkVendor(vendor, selector, options) {
    if (!jQuery()[vendor]) {
        console.log('ERROR: obsadź plugin: ' + vendor);
    } else {
        $(selector)[vendor](options);
    }
}

// Example use
checkVendor('select2', nativeSelect, defaultOptions);

// or the fastest way
if ($.fn.magnificPopup) {
    $('.popup').magnificPopup({
            type: 'image',
            closeOnContentClick: true,
            closeBtnInside: true
    });
}

// vanilla js

if (typeof Swiper === "function") {

    var swiper = new Swiper('.swiper-container', {
        paginationClickable: true,
        pagination: '.swiper-pagination',
        autoplay: 5000,
        loop: true,
        threshold: 100,
        spaceBetween: 15,
        effect: 'slide',
        speed: 700
    });
}