Update for evented API

extensions/sticky/js/src/addStickyBadge.js

@@ -0,0 +1,15 @@
+import { extend } from 'flarum/extend';
+import Discussion from 'flarum/models/Discussion';
+import Badge from 'flarum/components/Badge';
+
+export default function addStickyBadge() {
+  extend(Discussion.prototype, 'badges', function(badges) {
+    if (this.isSticky()) {
+      badges.add('sticky', Badge.component({
+        type: 'sticky',
+        label: app.trans('sticky.stickied'),
+        icon: 'thumb-tack'
+      }), 10);
+    }
+  });
+}