1 // TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
2 require('../modules/es.map');
3 require('../modules/es.weak-map');
4 var global = require('../internals/global');
5 var getBuiltIn = require('../internals/get-built-in');
6 var create = require('../internals/object-create');
7 var isObject = require('../internals/is-object');
9 var Object = global.Object;
10 var TypeError = global.TypeError;
11 var Map = getBuiltIn('Map');
12 var WeakMap = getBuiltIn('WeakMap');
14 var Node = function () {
19 this.primitives = null;
20 this.objectsByIndex = create(null);
23 Node.prototype.get = function (key, initializer) {
24 return this[key] || (this[key] = initializer());
27 Node.prototype.next = function (i, it, IS_OBJECT) {
29 ? this.objectsByIndex[i] || (this.objectsByIndex[i] = new WeakMap())
30 : this.primitives || (this.primitives = new Map());
31 var entry = store.get(it);
32 if (!entry) store.set(it, entry = new Node());
36 var root = new Node();
38 module.exports = function () {
40 var length = arguments.length;
42 // for prevent leaking, start from objects
43 for (i = 0; i < length; i++) {
44 if (isObject(it = arguments[i])) active = active.next(i, it, true);
46 if (this === Object && active === root) throw TypeError('Composite keys must contain a non-primitive component');
47 for (i = 0; i < length; i++) {
48 if (!isObject(it = arguments[i])) active = active.next(i, it, false);