Google Tag Manager JavaScript block code

googletagmanager.js

<!-- Start Google Tag Manager -->
<script>
	var dataLayer = [{ ambiente: 'PROD' }];
</script><!-- Google Tag Manager --><noscript>
	<iframe src="//www.googletagmanager.com/ns.html?id=GTM-XXXXXX" height="0" width="0" style="display:none;visibility:hidden"></iframe>
</noscript><script>
  (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= '//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-XXXXXX');
</script>
<!-- End Google Tag Manager -->