Pass default opts.

app/assets/javascripts/profile/profile.js.es6

 ((global) => {
 
   class Profile {
-    constructor({ form = $('.edit-user') }) {
+    constructor({ form = $('.edit-user') } = {}) {
       this.onSubmitForm = this.onSubmitForm.bind(this);
       this.form = form;
       this.bindEvents();

app/assets/javascripts/search_autocomplete.js.es6

@@ -15,7 +15,8 @@
       autocompletePath = optsEl.data('autocomplete-path'),
       projectId = (optsEl.data('autocomplete-project-id') || ''),
       projectRef = (optsEl.data('autocomplete-project-ref') || '')
-    }) {
+    } = {}) {
+
       this.bindEventContext();
       this.wrap = wrap;
       this.optsEl = optsEl;