SEO para ecommerce em VTEX e Shopify, da categoria à atribuição da venda

(function attributionGuard() {
  const CRITICAL = ['utm_source', 'utm_medium', 'utm_campaign',
                    'utm_content', 'utm_term', 'gclid', 'fbclid'];

  const params = new URLSearchParams(window.location.search);
  const saved = {};
  CRITICAL.forEach((k) => {
    if (params.has(k)) saved[k] = params.get(k);
  });

  if (Object.keys(saved).length) {
    sessionStorage.setItem('sp_attribution', JSON.stringify(saved));
  }

  const restore = () => {
    const current = new URLSearchParams(window.location.search);
    let dirty = false;
    Object.entries(saved).forEach(([k, v]) => {
      if (!current.has(k)) {
        current.set(k, v);
        dirty = true;
      }
    });
    if (dirty) {
      const clean = `${window.location.pathname}?${current}`;
      window.history.replaceState({}, '', clean);
    }
  };

  // Intercepta mudanças de URL feitas por outros scripts
  const originalReplace = history.replaceState;
  history.replaceState = function (...args) {
    originalReplace.apply(this, args);
    restore();
  };

  window.addEventListener('DOMContentLoaded', restore);
})();