mocksaml/pages/_app.tsx

import Layout from 'components/Layout';
import type { AppProps } from 'next/app';
import { useEffect } from 'react';
import TagManager from 'react-gtm-module';
import 'styles/globals.css';

function MyApp({ Component, pageProps }: AppProps) {
  useEffect(() => {
    if (process.env.NEXT_PUBLIC_GTM_ID && process.env.NEXT_PUBLIC_GTM_ID.length > 0) {
      TagManager.initialize({ gtmId: process.env.NEXT_PUBLIC_GTM_ID });
    }
  }, []);

  return (
    <Layout>
      <Component {...pageProps} />
    </Layout>
  );
}

export default MyApp;