discourse/app/assets/javascripts/admin/addon/controllers/admin-plugins.js

import { inject as service } from "@ember/service";
import Controller from "@ember/controller";

export default class AdminPluginsController extends Controller {
  @service router;

  get adminRoutes() {
    return this.allAdminRoutes.filter((r) => this.routeExists(r.full_location));
  }

  get brokenAdminRoutes() {
    return this.allAdminRoutes.filter(
      (r) => !this.routeExists(r.full_location)
    );
  }

  get allAdminRoutes() {
    return this.model
      .filter((p) => p?.enabled)
      .map((p) => {
        return p.admin_route;
      })
      .filter(Boolean);
  }

  routeExists(routeName) {
    try {
      this.router.urlFor(routeName);
      return true;
    } catch (e) {
      return false;
    }
  }
}