@liqd-js/clone/dist/clone.js

Object cloning function

'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = clone;
//https://github.com/pvorb/clone/blob/master/clone.js
function clonable(obj) {
    return (obj && typeof obj === 'object');
}
function clone_object(obj, proto, nodes) {
    if (nodes.has(obj)) {
        return nodes.get(obj);
    }
    let clone;
    if (Array.isArray(obj)) {
        clone = new Array(obj.length);
        for (let i = 0; i < obj.length; ++i) {
            clone[i] = clonable(obj[i]) ? clone_object(obj[i], proto, nodes) : obj[i];
        }
    }
    else if (obj instanceof Set) {
        clone = new Set();
        for (let value of obj) {
            clone.add(clonable(value) ? clone_object(value, proto, nodes) : value);
        }
    }
    else if (obj instanceof Map) {
        clone = new Map();
        for (let [key, value] of obj.entries()) {
            clone.set(clonable(key) ? clone_object(key, proto, nodes) : key, clonable(value) ? clone_object(value, proto, nodes) : value);
        }
    }
    else if (obj instanceof Date) {
        clone = new Date(obj.getTime());
    }
    else if (obj instanceof RegExp) {
        clone = new RegExp(obj.source, obj.flags);
    }
    else if (obj instanceof ArrayBuffer) {
        clone = obj.slice(0);
    }
    else if (obj instanceof DataView) {
        clone = new DataView(obj.buffer.slice(0), obj.byteOffset, obj.byteLength);
    }
    // TODO instanceof Promise
    else {
        if (proto || Object.getPrototypeOf(obj) === Object.prototype) {
            clone = proto ? Object.create(Object.getPrototypeOf(obj)) : new Object();
            for (let [key, value] of Object.entries(obj)) {
                clone[key] = clonable(value) ? clone_object(value, proto, nodes) : value;
            }
            // TODO Object.getOwnPropertySymbols
        }
        else {
            clone = obj;
        }
    }
    nodes.set(obj, clone);
    return clone;
}
function clone(value, proto = false) {
    return (clonable(value) ? clone_object(value, proto, new Map()) : value);
}