Asset pipeline can't handle es6

assets/javascripts/wizard-custom-start.js

@@ -1,11 +1,4 @@
 (function() {
   var wizard = require('discourse/plugins/discourse-custom-wizard/wizard/custom-wizard').default.create();
   wizard.start();
-  
-  Object.keys(Ember.TEMPLATES).forEach(k => {
-    if (k.indexOf("select-kit") === 0) {
-      let template = Ember.TEMPLATES[k];
-      define(k, () => template);
-    }
-  });
 })();

assets/javascripts/wizard/initializers/custom.js.es6

@@ -48,6 +48,13 @@ export default {
       };
 
     $.fn.autocomplete = autocomplete;
+    
+    Object.keys(Ember.TEMPLATES).forEach(k => {
+    if (k.indexOf("select-kit") === 0) {
+        let template = Ember.TEMPLATES[k];
+        define(k, () => template);
+      }
+    });
 
     const targets = ["controller", "component", "route", "model", "adapter"];