Relocate and fix jsesc issue

server/google-analytics.js

@@ -0,0 +1,19 @@
+const jsesc = require("jsesc");
+
+/**
+ * Returns a string that represents the javascript that is required to insert the Google Analytics scripts
+ * into a webpage.
+ * @param tagId Google UA/G/AW/DC Property ID to use with the Google Analytics script.
+ * @returns {string}
+ */
+function getGoogleAnalyticsScript(tagId) {
+    let escapedTagId = jsesc(tagId, { isScriptContext: true });
+    return `
+        <script async src="https://www.googletagmanager.com/gtag/js?id=${escapedTagId}"></script>
+        <script>window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date());gtag('config', '${escapedTagId}'); </script>
+    `;
+}
+
+module.exports = {
+    getGoogleAnalyticsScript,
+};