Failed to create JS UDF sometimes

[jovezhong]

I failed to create a JS UDF with the native JDBC driver

CREATE OR REPLACE FUNCTION bug1(arg0 string) RETURNS string LANGUAGE JAVASCRIPT AS $$
function _whois(ip){
    switch(ip){
        case '1.2.3.4': return 'Someone @ ACME';
        default: return 'Unknown';
    }
}
function bug1(ips){
    for(let i=0;i<ips.length;i++) {
      ips[i]=_whois(ips[i]);
    }
    return ips;
}
$$;

Error:

DB::ExceptionDB::Exception: the JavaScript UDF bug1 is invalid. Detail error: Uncaught SyntaxError: Unexpected token ')'. Stack trace:

But the same SQL can be run in web console

[jovezhong]

Low priority, since I wrote a test just with JDBC code and it works. But I can reproduce this in JDBC client: Chat2DB.