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- 'use strict';
- // TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
- require('../modules/es.map');
- require('../modules/es.weak-map');
- var getBuiltIn = require('../internals/get-built-in');
- var create = require('../internals/object-create');
- var isObject = require('../internals/is-object');
-
- var $Object = Object;
- var $TypeError = TypeError;
- var Map = getBuiltIn('Map');
- var WeakMap = getBuiltIn('WeakMap');
-
- var Node = function () {
- // keys
- this.object = null;
- this.symbol = null;
- // child nodes
- this.primitives = null;
- this.objectsByIndex = create(null);
- };
-
- Node.prototype.get = function (key, initializer) {
- return this[key] || (this[key] = initializer());
- };
-
- Node.prototype.next = function (i, it, IS_OBJECT) {
- var store = IS_OBJECT
- ? this.objectsByIndex[i] || (this.objectsByIndex[i] = new WeakMap())
- : this.primitives || (this.primitives = new Map());
- var entry = store.get(it);
- if (!entry) store.set(it, entry = new Node());
- return entry;
- };
-
- var root = new Node();
-
- module.exports = function () {
- var active = root;
- var length = arguments.length;
- var i, it;
- // for prevent leaking, start from objects
- for (i = 0; i < length; i++) {
- if (isObject(it = arguments[i])) active = active.next(i, it, true);
- }
- if (this === $Object && active === root) throw new $TypeError('Composite keys must contain a non-primitive component');
- for (i = 0; i < length; i++) {
- if (!isObject(it = arguments[i])) active = active.next(i, it, false);
- } return active;
- };
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