MediaWiki:Common.js

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function loadGoogleAnalytics(){
    var ga = document.createElement('script'); 
    ga.type = 'text/javascript'; 
    ga.async = true;
    ga.src = 'https://www.googletagmanager.com/gtag/js?id=G-BTFM8N0DCY';

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loadGoogleAnalytics();
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-BTFM8N0DCY');