Pull liked consolidated notification behaviour into its own class

app/assets/javascripts/discourse/widgets/default-notification-item.js.es6

@@ -59,16 +59,6 @@ export const DefaultNotificationItem =
         return userPath(data.display_username);
       }
 
-      if (attrs.notification_type === notificationTypes.liked_consolidated) {
-        return userPath(
-          `${this.attrs.username ||
-            this.currentUser
-              .username}/notifications/likes-received?acting_username=${
-            data.display_username
-          }`
-        );
-      }
-
       if (data.group_id) {
         return userPath(data.username + "/messages/group/" + data.group_name);
       }
@@ -90,18 +80,7 @@ export const DefaultNotificationItem =
         return this.attrs.fancy_title;
       }
 
-      let description;
+      const description = data.topic_title;
-
-      if (
-        this.attrs.notification_type ===
-        this.site.notification_types.liked_consolidated
-      ) {
-        description = I18n.t("notifications.liked_consolidated_description", {
-          count: parseInt(data.count)
-        });
-      } else {
-        description = data.topic_title;
-      }
 
       return Ember.isEmpty(description) ? "" : escapeExpression(description);
     },

app/assets/javascripts/discourse/widgets/liked-consolidated-notification-item.js.es6

@@ -0,0 +1,30 @@
+import { createWidgetFrom } from "discourse/widgets/widget";
+import { DefaultNotificationItem } from "discourse/widgets/default-notification-item";
+import { escapeExpression } from "discourse/lib/utilities";
+import { userPath } from "discourse/lib/url";
+
+createWidgetFrom(DefaultNotificationItem, "liked-consolidated-notification-item", {
+  url() {
+    const attrs = this.attrs;
+    const data = attrs.data;
+
+    return userPath(
+      `${this.attrs.username ||
+        this.currentUser
+          .username}/notifications/likes-received?acting_username=${
+        data.display_username
+      }`
+    );
+  },
+
+  description() {
+    const data = this.attrs.data;
+
+    const description =
+      I18n.t("notifications.liked_consolidated_description", {
+        count: parseInt(data.count)
+      });
+
+    return Ember.isEmpty(description) ? "" : escapeExpression(description);
+  }
+});