Flickity next/prev buttons disable on "last page" when using contain

slider-prev-next-buttons.js

import Flickity from 'flickity';

(() => {
  const { PrevNextButton } = Flickity;
  const parentUpdate = PrevNextButton.prototype.update;

  PrevNextButton.prototype.update = function update() {
    parentUpdate.call(this);

    if (this.parent.slideableWidth < this.parent.size.innerWidth) {
      this.disable();
      // this.element.classList.add('hide');
    } else if (this.element.classList.contains('hide')) {
      // this.element.classList.remove('hide');
    }

    // disable next button of "last page"
    if (this.parent.options.contain) {
      const { cells } = this.parent;
      let isEnabling = true;
      const selectedCell = cells[this.parent.selectedIndex];

      if (!this.isPrevious) {
        isEnabling = selectedCell.target + this.parent.size.width < this.parent.slideableWidth;
        const method = isEnabling ? 'enable' : 'disable';
        this[method]();
      }
    }
  };
})();