Smart Link SDK with Gatsby

Layout.jsx

import KontentSmartLink from '@kentico/kontent-smart-link';
import '@kentico/kontent-smart-link/dist/kontent-smart-link.styles.css';

export default function Layout({ children }) {
    useEffect(() => {
        const kontentSmartLink = KontentSmartLink.initialize({
          queryParam: 'preview-mode'    
        });
        return () => {
          kontentSmartLink.destroy();
        }; 
    });
 
    return (
      <div class="layout">{children}</div>
  );
}