1 // TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
2 var Map = require('../modules/es.map');
3 var WeakMap = require('../modules/es.weak-map');
4 var create = require('../internals/object-create');
5 var isObject = require('../internals/is-object');
7 var Node = function () {
12 this.primitives = null;
13 this.objectsByIndex = create(null);
16 Node.prototype.get = function (key, initializer) {
17 return this[key] || (this[key] = initializer());
20 Node.prototype.next = function (i, it, IS_OBJECT) {
22 ? this.objectsByIndex[i] || (this.objectsByIndex[i] = new WeakMap())
23 : this.primitives || (this.primitives = new Map());
24 var entry = store.get(it);
25 if (!entry) store.set(it, entry = new Node());
29 var root = new Node();
31 module.exports = function () {
33 var length = arguments.length;
35 // for prevent leaking, start from objects
36 for (i = 0; i < length; i++) {
37 if (isObject(it = arguments[i])) active = active.next(i, it, true);
39 if (this === Object && active === root) throw TypeError('Composite keys must contain a non-primitive component');
40 for (i = 0; i < length; i++) {
41 if (!isObject(it = arguments[i])) active = active.next(i, it, false);