GraalJS has ~99% support of the JS language features, as for GraalPython it's unclear to me what's missing but it should get feature parity in the next few year

GraalJS has ~99% support of the JS language features, as for GraalPython it's unclear to me what's missing but it should get feature parity in the next few years. It already support modern python versions so that's a good sign.