source: trip-planner-front/node_modules/klona/full/index.mjs@ ceaed42

function set(obj, key, val) {
        if (typeof val.value === 'object') val.value = klona(val.value);
        if (!val.enumerable || val.get || val.set || !val.configurable || !val.writable || key === '__proto__') {
                Object.defineProperty(obj, key, val);
        } else obj[key] = val.value;
}

export function klona(x) {
        if (typeof x !== 'object') return x;

        var i=0, k, list, tmp, str=Object.prototype.toString.call(x);

        if (str === '[object Object]') {
                tmp = Object.create(x.__proto__ || null);
        } else if (str === '[object Array]') {
                tmp = Array(x.length);
        } else if (str === '[object Set]') {
                tmp = new Set;
                x.forEach(function (val) {
                        tmp.add(klona(val));
                });
        } else if (str === '[object Map]') {
                tmp = new Map;
                x.forEach(function (val, key) {
                        tmp.set(klona(key), klona(val));
                });
        } else if (str === '[object Date]') {
                tmp = new Date(+x);
        } else if (str === '[object RegExp]') {
                tmp = new RegExp(x.source, x.flags);
        } else if (str === '[object DataView]') {
                tmp = new x.constructor( klona(x.buffer) );
        } else if (str === '[object ArrayBuffer]') {
                tmp = x.slice(0);
        } else if (str.slice(-6) === 'Array]') {
                // ArrayBuffer.isView(x)
                // ~> `new` bcuz `Buffer.slice` => ref
                tmp = new x.constructor(x);
        }

        if (tmp) {
                for (list=Object.getOwnPropertySymbols(x); i < list.length; i++) {
                        set(tmp, list[i], Object.getOwnPropertyDescriptor(x, list[i]));
                }

                for (i=0, list=Object.getOwnPropertyNames(x); i < list.length; i++) {
                        if (Object.hasOwnProperty.call(tmp, k=list[i]) && tmp[k] === x[k]) continue;
                        set(tmp, k, Object.getOwnPropertyDescriptor(x, k));
                }
        }

        return tmp || x;
}