const currencyRates = {
        "$": 4.02,
        "€": 4.32,
      }
      
      const createElementWithOptions = (type, options = {}) => Object.assign(document.createElement(type), options);
      const prices = Array.from(document.querySelectorAll(".price")).flatMap(el => Array.from(el.childNodes).slice(1, 3));

      prices.forEach(el => {
        if(el.textContent.includes("zł")) return;
        const trimmed = el.textContent.trim();
        console.log(trimmed);
        const textContent = `${(Number(trimmed.substring(1)) * currencyRates[trimmed[0]]).toFixed(2)} zł`.replace('.', ',');
        el.textContent = el.nodeName !== "#text" ? textContent : ` ${textContent} `;
        if (el.nodeName !== "#text") {
          return;
        }
      
        el.nextElementSibling.textContent = `${trimmed} ${el.nextElementSibling.textContent}`;
      
        const smallEl = createElementWithOptions("small", {'textContent': 'ok.'});
        smallEl.style.fontWeight = "normal";
        smallEl.style.fontSize = "12px";
        el.parentElement.insertBefore(smallEl, el);
      });