Mouse wheel scroll on Flickity slider

slider.js

// Include https://github.com/jquery/jquery-mousewheel


if (document.querySelector('.js-carousel')) {
    const flickityElement = jQuery('.js-carousel').flickity({
        prevNextButtons: false,
        pageDots: false,
        contain: true,
        freeScroll: true,
        cellAlign: 'left',
        imagesLoaded: true
    });


    jQuery('.js-carousel').on('mousewheel', function (event) {
        const firstCell = jQuery('.js-carousel .flickity-slider .c-carousel__slide:first-child').offset()
        const lastCell = Math.round(jQuery('.js-carousel .flickity-slider .c-carousel__slide:last-child').offset().left)
        const sliderWidth = Math.round(jQuery('.js-carousel .flickity-slider').width() - jQuery('.js-carousel .flickity-slider .c-carousel__slide:last-child').width())

        if (jQuery('.js-carousel .flickity-slider .c-carousel__slide:last-child').visible()){
            jQuery('.js-carousel .flickity-slider .c-carousel__slide:last-child').addClass('is-selected')
        } else {
            jQuery('.js-carousel .flickity-slider .c-carousel__slide:last-child').removeClass('is-selected')
        }

        if (event.deltaY === -1) {
            if (sliderWidth <= lastCell) {
                event.preventDefault();
                event.stopPropagation();
                const flickity = flickityElement.data("flickity"); // [1]
                flickity.velocity = -12; // [2]
                flickity.isFreeScrolling = true; // [3]
                flickity.startAnimation(); // [4]
                flickityElement.trigger('settle.flickity')
                flickityElement.flickity( 'select', jQuery('.js-carousel .flickity-slider .c-carousel__slide').length )
            }
        } else {
            if (Math.round(firstCell.left) < 50) {
                event.preventDefault();
                event.stopPropagation();
                const flickity = flickityElement.data("flickity"); // [1]
                flickity.velocity = 12; // [2]
                flickity.isFreeScrolling = true; // [3]
                flickity.startAnimation(); // [4]
                flickityElement.flickity( 'select', 0 )
            }
        }
    });

    setInterval(function () {
        const currTrans = jQuery('.js-carousel .flickity-slider').css('transform').split(/[()]/)[1];
        const sliderXPos = currTrans.split(',')[4];
        if (sliderXPos > 0) {
            flickityElement.flickity( 'select', 1 )
            flickityElement.flickity( 'select', 0 )
        }
    }, 2000)
}