Clear unused code

app/routes/admin/indexes/item/settings.js

@@ -1,39 +1,6 @@
 import Route from '@ember/routing/route';
 import { hash } from 'rsvp';
 
-function attributeValue(key) {
-  return function () {
-    return {
-      get() {
-        return this.settings[key].includes(this.name);
-      },
-
-      set(value) {
-        if (value) {
-          this.settings[key].addObject(this.name);
-        } else {
-          this.settings[key].removeObject(this.name);
-        }
-      },
-    };
-  };
-}
-
-class IndexAttribute {
-  name;
-  settings;
-
-  @attributeValue('displayedAttributes') displayed;
-  @attributeValue('filterableAttributes') filterable;
-  @attributeValue('searchableAttributes') searchable;
-  @attributeValue('sortableAttributes') sortable;
-
-  constructor(name, settings) {
-    this.name = name;
-    this.settings = settings;
-  }
-}
-
 export default class AdminIndexesItemSettingsRoute extends Route {
   async model() {
     const index = this.modelFor('admin.indexes.item');