GOG.com display discount in games selection list

GOG_display_discounts.js

document
  .querySelectorAll('.product-row__price.product-row__alignment')
  .forEach((row) => {
    const node = row.querySelector('.product-row-price--old ._price');
    const oldPrice = parseFloat(node.innerText);
    const newPrice = parseFloat(
      row.querySelector('.product-row-price--new ._price').innerText,
    );
    node.innerText = ` ${((1 - newPrice / oldPrice) * 100) >> 0}%`;
    node.parentElement.style.textDecoration = 'none';
  });

GOG_display_discounts_and_sort.js

(() => {
  const list = Array.from(document.querySelectorAll('.product-row'));
  list.forEach((row) => {
  const prices = row.querySelector('.product-row__price.product-row__alignment');
  const discountNode = prices.querySelector('.product-row-price--old ._price');
    const oldPrice = parseFloat(discountNode.innerText);
    const newPrice = parseFloat(
      prices.querySelector('.product-row-price--new ._price').innerText,
    );
    const discount = ((1 - newPrice / oldPrice) * 100) >> 0;
    discountNode.innerText = ` ${discount}%`;
    discountNode.parentElement.style.textDecoration = 'none';
  row.perc = discount; 
});
  
  list.sort((r1, r2) => parseFloat(r1.perc) > parseFloat(r2.perc) ? -1 : 1)
.reverse()
.forEach((row) => document.querySelector('.list__products').prepend(row));
})();

GOG_find_discounts_on_store_pages.js

(() => {
  const minDiscount = 80; // minimum discount to look for
  const lastPage = 51; // last page on stre page

  const list = [];
  const findDiscounts = () =>
    Array.from(document.querySelectorAll('.list-view__item')).forEach((node) => {
      const discountNode = node.querySelector('.product-tile__discount');

      if (node.querySelector('.product-tile__labels--in-library') || !discountNode) {
        return;
      }

      discount = parseInt((discountNode.innerText.match(/^\s*-(\d+)%\s*$/) || ['0', '0'])[1], 10);
      if (discount >= minDiscount) {
        list.push({ discount, node });
      }
    });

  const goNextPage = async () => {
    document.querySelector('.arrow-wrapper.arrow-wrapper--right').click();

    await new Promise((res) => setTimeout(res, 3000));
  };

  const showResult = () => {
    document.querySelectorAll('.list-view__item').forEach((node) => node.remove());
    const parent = document.querySelector('.list-inner');

    list.sort(({ discount: a }, { discount: b }) => (a < b ? 1 : -1)).forEach(({ node }) => parent.appendChild(node));
  };

  const read = async () => {
    for (let page = 1; page <= lastPage; page++) {
      findDiscounts();
      await goNextPage();
    }

    showResult();
  };

  read();
})();