-- file.mts --
== should keep trailing comma for type parameter with only identifier ==
const x = <T,>(value: T): T => value;
const y = <T extends string>(value: T): T => value;
const z = <T, U>(value: T): T => value;

[expect]
const x = <T,>(value: T): T => value;
const y = <T extends string>(value: T): T => value;
const z = <T, U>(value: T): T => value;