return writer.toString();
        }

    }

    // public for injection
    public static class DefaultVersionCatalogsExtension implements VersionCatalogsExtension {

        private final Map<String, VersionCatalog> catalogs;

        @Inject
        public DefaultVersionCatalogsExtension(Map<String, VersionCatalog> catalogs) {
            this.catalogs = catalogs;
        }

        @Override