2 var $ = require('../internals/export');
3 var global = require('../internals/global');
4 var isForced = require('../internals/is-forced');
5 var redefine = require('../internals/redefine');
6 var InternalMetadataModule = require('../internals/internal-metadata');
7 var iterate = require('../internals/iterate');
8 var anInstance = require('../internals/an-instance');
9 var isObject = require('../internals/is-object');
10 var fails = require('../internals/fails');
11 var checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');
12 var setToStringTag = require('../internals/set-to-string-tag');
13 var inheritIfRequired = require('../internals/inherit-if-required');
15 module.exports = function (CONSTRUCTOR_NAME, wrapper, common) {
16 var IS_MAP = CONSTRUCTOR_NAME.indexOf('Map') !== -1;
17 var IS_WEAK = CONSTRUCTOR_NAME.indexOf('Weak') !== -1;
18 var ADDER = IS_MAP ? 'set' : 'add';
19 var NativeConstructor = global[CONSTRUCTOR_NAME];
20 var NativePrototype = NativeConstructor && NativeConstructor.prototype;
21 var Constructor = NativeConstructor;
24 var fixMethod = function (KEY) {
25 var nativeMethod = NativePrototype[KEY];
26 redefine(NativePrototype, KEY,
27 KEY == 'add' ? function add(value) {
28 nativeMethod.call(this, value === 0 ? 0 : value);
30 } : KEY == 'delete' ? function (key) {
31 return IS_WEAK && !isObject(key) ? false : nativeMethod.call(this, key === 0 ? 0 : key);
32 } : KEY == 'get' ? function get(key) {
33 return IS_WEAK && !isObject(key) ? undefined : nativeMethod.call(this, key === 0 ? 0 : key);
34 } : KEY == 'has' ? function has(key) {
35 return IS_WEAK && !isObject(key) ? false : nativeMethod.call(this, key === 0 ? 0 : key);
36 } : function set(key, value) {
37 nativeMethod.call(this, key === 0 ? 0 : key, value);
43 // eslint-disable-next-line max-len
44 if (isForced(CONSTRUCTOR_NAME, typeof NativeConstructor != 'function' || !(IS_WEAK || NativePrototype.forEach && !fails(function () {
45 new NativeConstructor().entries().next();
47 // create collection constructor
48 Constructor = common.getConstructor(wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER);
49 InternalMetadataModule.REQUIRED = true;
50 } else if (isForced(CONSTRUCTOR_NAME, true)) {
51 var instance = new Constructor();
52 // early implementations not supports chaining
53 var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance;
54 // V8 ~ Chromium 40- weak-collections throws on primitives, but should return false
55 var THROWS_ON_PRIMITIVES = fails(function () { instance.has(1); });
56 // most early implementations doesn't supports iterables, most modern - not close it correctly
57 // eslint-disable-next-line no-new
58 var ACCEPT_ITERABLES = checkCorrectnessOfIteration(function (iterable) { new NativeConstructor(iterable); });
59 // for early implementations -0 and +0 not the same
60 var BUGGY_ZERO = !IS_WEAK && fails(function () {
61 // V8 ~ Chromium 42- fails only with 5+ elements
62 var $instance = new NativeConstructor();
64 while (index--) $instance[ADDER](index, index);
65 return !$instance.has(-0);
68 if (!ACCEPT_ITERABLES) {
69 Constructor = wrapper(function (dummy, iterable) {
70 anInstance(dummy, Constructor, CONSTRUCTOR_NAME);
71 var that = inheritIfRequired(new NativeConstructor(), dummy, Constructor);
72 if (iterable != undefined) iterate(iterable, that[ADDER], { that: that, AS_ENTRIES: IS_MAP });
75 Constructor.prototype = NativePrototype;
76 NativePrototype.constructor = Constructor;
79 if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) {
82 IS_MAP && fixMethod('get');
85 if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER);
87 // weak collections should not contains .clear method
88 if (IS_WEAK && NativePrototype.clear) delete NativePrototype.clear;
91 exported[CONSTRUCTOR_NAME] = Constructor;
92 $({ global: true, forced: Constructor != NativeConstructor }, exported);
94 setToStringTag(Constructor, CONSTRUCTOR_NAME);
96 if (!IS_WEAK) common.setStrong(Constructor, CONSTRUCTOR_NAME, IS_MAP);