my $getKeys = $ff->application->repl->declare(<<'JS', 'list');
    function(obj){
        var res = [];
        for (var el in obj) {
            if (Object.hasOwnProperty.apply(obj,[el])) {
                res.push(el);
            };
        }
        return res
    }
JS

##</code><code>##

my @keys = keys %$link;