watchForElement function - if specefic element add or remove from dom

gistfile1.txt

watchForElement(className , cb) {
      const observer = new MutationObserver((mutationsList) => {
        for (const mutation of mutationsList) {
          if (mutation.type === 'childList') {
            const addedNodes = Array.from(mutation.addedNodes);
            const elementExists = addedNodes.some(node => node.classList && node.classList.contains(`${className}`));

            if (elementExists) {
              // Element with the specific class has been added to the DOM
              console.log('Element added!');
              cb();
            }
          }
        }
      });

      observer.observe(document.body, { childList: true, subtree: true });
    },