Scope js to it's own IIFE

public/assets/enhancements.js

@@ -1,8 +1,12 @@
-// Check if DOM has already loaded as we're loading async
-['interactive', 'complete'].indexOf(document.readyState) >= 0
-  ? init()
-  : document.addEventListener('DOMContentLoaded', init);
+(function() {
 
-// When DOM is ready
-function init() {
-}
+  // Check if DOM has already loaded as we're loading async
+  ['interactive', 'complete'].indexOf(document.readyState) >= 0
+    ? init()
+    : document.addEventListener('DOMContentLoaded', init);
+
+  // When DOM is ready
+  function init() {
+  }
+
+})();