Adding default queryParams in Angular 21

import { createUrlTreeFromSnapshot } from "@angular/router";
export const ensureDefaultQueryParamsGuard: CanActivateFn =
    (newRoute: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean | UrlTree => {
    const router = inject(Router);
    const oldUrlTree = router.parseUrl(router.url);
    // Copy the customer Id from the old route to the new one
    const myCustId = oldUrlTree.queryParams.feature;
    if (myCustId && !newRoute.queryParams.myCustId) {
        const newQueryParams = { ...newRoute.queryParams, myCustId };
        return createUrlTreeFromSnapshot(newRoute, ["."], newQueryParams);
    }
    // If the custId is already in the naviation route, continue with the 
    // original navigation
    return true;
}