--- /dev/null
+'use strict';
+var $ = require('../internals/export');
+var global = require('../internals/global');
+var getBuiltIn = require('../internals/get-built-in');
+var IS_PURE = require('../internals/is-pure');
+var DESCRIPTORS = require('../internals/descriptors');
+var NATIVE_SYMBOL = require('../internals/native-symbol');
+var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
+var fails = require('../internals/fails');
+var has = require('../internals/has');
+var isArray = require('../internals/is-array');
+var isObject = require('../internals/is-object');
+var anObject = require('../internals/an-object');
+var toObject = require('../internals/to-object');
+var toIndexedObject = require('../internals/to-indexed-object');
+var toPrimitive = require('../internals/to-primitive');
+var createPropertyDescriptor = require('../internals/create-property-descriptor');
+var nativeObjectCreate = require('../internals/object-create');
+var objectKeys = require('../internals/object-keys');
+var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');
+var getOwnPropertyNamesExternal = require('../internals/object-get-own-property-names-external');
+var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');
+var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
+var definePropertyModule = require('../internals/object-define-property');
+var propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');
+var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
+var redefine = require('../internals/redefine');
+var shared = require('../internals/shared');
+var sharedKey = require('../internals/shared-key');
+var hiddenKeys = require('../internals/hidden-keys');
+var uid = require('../internals/uid');
+var wellKnownSymbol = require('../internals/well-known-symbol');
+var wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');
+var defineWellKnownSymbol = require('../internals/define-well-known-symbol');
+var setToStringTag = require('../internals/set-to-string-tag');
+var InternalStateModule = require('../internals/internal-state');
+var $forEach = require('../internals/array-iteration').forEach;
+
+var HIDDEN = sharedKey('hidden');
+var SYMBOL = 'Symbol';
+var PROTOTYPE = 'prototype';
+var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
+var setInternalState = InternalStateModule.set;
+var getInternalState = InternalStateModule.getterFor(SYMBOL);
+var ObjectPrototype = Object[PROTOTYPE];
+var $Symbol = global.Symbol;
+var $stringify = getBuiltIn('JSON', 'stringify');
+var nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
+var nativeDefineProperty = definePropertyModule.f;
+var nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;
+var nativePropertyIsEnumerable = propertyIsEnumerableModule.f;
+var AllSymbols = shared('symbols');
+var ObjectPrototypeSymbols = shared('op-symbols');
+var StringToSymbolRegistry = shared('string-to-symbol-registry');
+var SymbolToStringRegistry = shared('symbol-to-string-registry');
+var WellKnownSymbolsStore = shared('wks');
+var QObject = global.QObject;
+// Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173
+var USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;
+
+// fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687
+var setSymbolDescriptor = DESCRIPTORS && fails(function () {
+ return nativeObjectCreate(nativeDefineProperty({}, 'a', {
+ get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }
+ })).a != 7;
+}) ? function (O, P, Attributes) {
+ var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);
+ if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];
+ nativeDefineProperty(O, P, Attributes);
+ if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {
+ nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);
+ }
+} : nativeDefineProperty;
+
+var wrap = function (tag, description) {
+ var symbol = AllSymbols[tag] = nativeObjectCreate($Symbol[PROTOTYPE]);
+ setInternalState(symbol, {
+ type: SYMBOL,
+ tag: tag,
+ description: description
+ });
+ if (!DESCRIPTORS) symbol.description = description;
+ return symbol;
+};
+
+var isSymbol = USE_SYMBOL_AS_UID ? function (it) {
+ return typeof it == 'symbol';
+} : function (it) {
+ return Object(it) instanceof $Symbol;
+};
+
+var $defineProperty = function defineProperty(O, P, Attributes) {
+ if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);
+ anObject(O);
+ var key = toPrimitive(P, true);
+ anObject(Attributes);
+ if (has(AllSymbols, key)) {
+ if (!Attributes.enumerable) {
+ if (!has(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, {}));
+ O[HIDDEN][key] = true;
+ } else {
+ if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;
+ Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });
+ } return setSymbolDescriptor(O, key, Attributes);
+ } return nativeDefineProperty(O, key, Attributes);
+};
+
+var $defineProperties = function defineProperties(O, Properties) {
+ anObject(O);
+ var properties = toIndexedObject(Properties);
+ var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));
+ $forEach(keys, function (key) {
+ if (!DESCRIPTORS || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);
+ });
+ return O;
+};
+
+var $create = function create(O, Properties) {
+ return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);
+};
+
+var $propertyIsEnumerable = function propertyIsEnumerable(V) {
+ var P = toPrimitive(V, true);
+ var enumerable = nativePropertyIsEnumerable.call(this, P);
+ if (this === ObjectPrototype && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;
+ return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;
+};
+
+var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {
+ var it = toIndexedObject(O);
+ var key = toPrimitive(P, true);
+ if (it === ObjectPrototype && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;
+ var descriptor = nativeGetOwnPropertyDescriptor(it, key);
+ if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {
+ descriptor.enumerable = true;
+ }
+ return descriptor;
+};
+
+var $getOwnPropertyNames = function getOwnPropertyNames(O) {
+ var names = nativeGetOwnPropertyNames(toIndexedObject(O));
+ var result = [];
+ $forEach(names, function (key) {
+ if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);
+ });
+ return result;
+};
+
+var $getOwnPropertySymbols = function getOwnPropertySymbols(O) {
+ var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;
+ var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));
+ var result = [];
+ $forEach(names, function (key) {
+ if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype, key))) {
+ result.push(AllSymbols[key]);
+ }
+ });
+ return result;
+};
+
+// `Symbol` constructor
+// https://tc39.es/ecma262/#sec-symbol-constructor
+if (!NATIVE_SYMBOL) {
+ $Symbol = function Symbol() {
+ if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');
+ var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);
+ var tag = uid(description);
+ var setter = function (value) {
+ if (this === ObjectPrototype) setter.call(ObjectPrototypeSymbols, value);
+ if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;
+ setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));
+ };
+ if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });
+ return wrap(tag, description);
+ };
+
+ redefine($Symbol[PROTOTYPE], 'toString', function toString() {
+ return getInternalState(this).tag;
+ });
+
+ redefine($Symbol, 'withoutSetter', function (description) {
+ return wrap(uid(description), description);
+ });
+
+ propertyIsEnumerableModule.f = $propertyIsEnumerable;
+ definePropertyModule.f = $defineProperty;
+ getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;
+ getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;
+ getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;
+
+ wrappedWellKnownSymbolModule.f = function (name) {
+ return wrap(wellKnownSymbol(name), name);
+ };
+
+ if (DESCRIPTORS) {
+ // https://github.com/tc39/proposal-Symbol-description
+ nativeDefineProperty($Symbol[PROTOTYPE], 'description', {
+ configurable: true,
+ get: function description() {
+ return getInternalState(this).description;
+ }
+ });
+ if (!IS_PURE) {
+ redefine(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });
+ }
+ }
+}
+
+$({ global: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {
+ Symbol: $Symbol
+});
+
+$forEach(objectKeys(WellKnownSymbolsStore), function (name) {
+ defineWellKnownSymbol(name);
+});
+
+$({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {
+ // `Symbol.for` method
+ // https://tc39.es/ecma262/#sec-symbol.for
+ 'for': function (key) {
+ var string = String(key);
+ if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
+ var symbol = $Symbol(string);
+ StringToSymbolRegistry[string] = symbol;
+ SymbolToStringRegistry[symbol] = string;
+ return symbol;
+ },
+ // `Symbol.keyFor` method
+ // https://tc39.es/ecma262/#sec-symbol.keyfor
+ keyFor: function keyFor(sym) {
+ if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');
+ if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
+ },
+ useSetter: function () { USE_SETTER = true; },
+ useSimple: function () { USE_SETTER = false; }
+});
+
+$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {
+ // `Object.create` method
+ // https://tc39.es/ecma262/#sec-object.create
+ create: $create,
+ // `Object.defineProperty` method
+ // https://tc39.es/ecma262/#sec-object.defineproperty
+ defineProperty: $defineProperty,
+ // `Object.defineProperties` method
+ // https://tc39.es/ecma262/#sec-object.defineproperties
+ defineProperties: $defineProperties,
+ // `Object.getOwnPropertyDescriptor` method
+ // https://tc39.es/ecma262/#sec-object.getownpropertydescriptors
+ getOwnPropertyDescriptor: $getOwnPropertyDescriptor
+});
+
+$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {
+ // `Object.getOwnPropertyNames` method
+ // https://tc39.es/ecma262/#sec-object.getownpropertynames
+ getOwnPropertyNames: $getOwnPropertyNames,
+ // `Object.getOwnPropertySymbols` method
+ // https://tc39.es/ecma262/#sec-object.getownpropertysymbols
+ getOwnPropertySymbols: $getOwnPropertySymbols
+});
+
+// Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives
+// https://bugs.chromium.org/p/v8/issues/detail?id=3443
+$({ target: 'Object', stat: true, forced: fails(function () { getOwnPropertySymbolsModule.f(1); }) }, {
+ getOwnPropertySymbols: function getOwnPropertySymbols(it) {
+ return getOwnPropertySymbolsModule.f(toObject(it));
+ }
+});
+
+// `JSON.stringify` method behavior with symbols
+// https://tc39.es/ecma262/#sec-json.stringify
+if ($stringify) {
+ var FORCED_JSON_STRINGIFY = !NATIVE_SYMBOL || fails(function () {
+ var symbol = $Symbol();
+ // MS Edge converts symbol values to JSON as {}
+ return $stringify([symbol]) != '[null]'
+ // WebKit converts symbol values to JSON as null
+ || $stringify({ a: symbol }) != '{}'
+ // V8 throws on boxed symbols
+ || $stringify(Object(symbol)) != '{}';
+ });
+
+ $({ target: 'JSON', stat: true, forced: FORCED_JSON_STRINGIFY }, {
+ // eslint-disable-next-line no-unused-vars -- required for `.length`
+ stringify: function stringify(it, replacer, space) {
+ var args = [it];
+ var index = 1;
+ var $replacer;
+ while (arguments.length > index) args.push(arguments[index++]);
+ $replacer = replacer;
+ if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
+ if (!isArray(replacer)) replacer = function (key, value) {
+ if (typeof $replacer == 'function') value = $replacer.call(this, key, value);
+ if (!isSymbol(value)) return value;
+ };
+ args[1] = replacer;
+ return $stringify.apply(null, args);
+ }
+ });
+}
+
+// `Symbol.prototype[@@toPrimitive]` method
+// https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive
+if (!$Symbol[PROTOTYPE][TO_PRIMITIVE]) {
+ createNonEnumerableProperty($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);
+}
+// `Symbol.prototype[@@toStringTag]` property
+// https://tc39.es/ecma262/#sec-symbol.prototype-@@tostringtag
+setToStringTag($Symbol, SYMBOL);
+
+hiddenKeys[HIDDEN] = true;
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