extract inline JS for google analytics

app/assets/javascripts/google-universal-analytics.js

@@ -0,0 +1,20 @@
+/* eslint-disable */
+// prettier-ignore
+(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+/* eslint-enable */
+
+(function() {
+  const gaDataElement = document.getElementById("data-ga-universal-analytics");
+  const gaJson = JSON.parse(gaDataElement.dataset.json);
+
+  window.ga("create", gaDataElement.dataset.trackingCode, gaJson);
+  if (gaDataElement.dataset.autoLinkDomains.length) {
+    const autoLinkDomains = gaDataElement.dataset.autoLinkDomains.split("|");
+
+    window.ga("require", "linker");
+    window.ga("linker:autoLink", autoLinkDomains);
+  }
+})();

app/views/common/_google_universal_analytics.html.erb

@@ -1,14 +1,7 @@
-<script>
-  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+<%= tag.meta id: 'data-ga-universal-analytics', data: {
+  tracking_code: SiteSetting.ga_universal_tracking_code,
+  json: ga_universal_json,
+  auto_link_domains: SiteSetting.ga_universal_auto_link_domains
+} %>
 
-  ga('create', '<%= SiteSetting.ga_universal_tracking_code %>', <%= ga_universal_json %>);
-
-  <% if SiteSetting.ga_universal_auto_link_domains.present? %>
-  ga('require', 'linker');
-  ga('linker:autoLink', <%= raw SiteSetting.ga_universal_auto_link_domains.split('|').to_json %>);
-  <% end %>
-
-</script>
+<%= preload_script "google-universal-analytics" %>