source: frontend/node_modules/klona/json/index.js

function klona(val) {
        var k, out, tmp;

        if (Array.isArray(val)) {
                out = Array(k=val.length);
                while (k--) out[k] = (tmp=val[k]) && typeof tmp === 'object' ? klona(tmp) : tmp;
                return out;
        }

        if (Object.prototype.toString.call(val) === '[object Object]') {
                out = {}; // null
                for (k in val) {
                        if (k === '__proto__') {
                                Object.defineProperty(out, k, {
                                        value: klona(val[k]),
                                        configurable: true,
                                        enumerable: true,
                                        writable: true,
                                });
                        } else {
                                out[k] = (tmp=val[k]) && typeof tmp === 'object' ? klona(tmp) : tmp;
                        }
                }
                return out;
        }

        return val;
}

exports.klona = klona;