'use strict';
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var $ = require('../internals/export');
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var global = require('../internals/global');
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var anInstance = require('../internals/an-instance');
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var anObject = require('../internals/an-object');
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var isCallable = require('../internals/is-callable');
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var getPrototypeOf = require('../internals/object-get-prototype-of');
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var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
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var createProperty = require('../internals/create-property');
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var fails = require('../internals/fails');
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var hasOwn = require('../internals/has-own-property');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
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var DESCRIPTORS = require('../internals/descriptors');
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var IS_PURE = require('../internals/is-pure');
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var CONSTRUCTOR = 'constructor';
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var ITERATOR = 'Iterator';
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var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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var $TypeError = TypeError;
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var NativeIterator = global[ITERATOR];
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// FF56- have non-standard global helper `Iterator`
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var FORCED = IS_PURE
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|| !isCallable(NativeIterator)
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|| NativeIterator.prototype !== IteratorPrototype
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// FF44- non-standard `Iterator` passes previous tests
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|| !fails(function () { NativeIterator({}); });
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var IteratorConstructor = function Iterator() {
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anInstance(this, IteratorPrototype);
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if (getPrototypeOf(this) === IteratorPrototype) throw new $TypeError('Abstract class Iterator not directly constructable');
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};
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var defineIteratorPrototypeAccessor = function (key, value) {
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if (DESCRIPTORS) {
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defineBuiltInAccessor(IteratorPrototype, key, {
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configurable: true,
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get: function () {
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return value;
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},
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set: function (replacement) {
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anObject(this);
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if (this === IteratorPrototype) throw new $TypeError("You can't redefine this property");
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if (hasOwn(this, key)) this[key] = replacement;
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else createProperty(this, key, replacement);
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}
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});
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} else IteratorPrototype[key] = value;
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};
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if (!hasOwn(IteratorPrototype, TO_STRING_TAG)) defineIteratorPrototypeAccessor(TO_STRING_TAG, ITERATOR);
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if (FORCED || !hasOwn(IteratorPrototype, CONSTRUCTOR) || IteratorPrototype[CONSTRUCTOR] === Object) {
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defineIteratorPrototypeAccessor(CONSTRUCTOR, IteratorConstructor);
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}
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IteratorConstructor.prototype = IteratorPrototype;
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// `Iterator` constructor
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// https://github.com/tc39/proposal-iterator-helpers
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$({ global: true, constructor: true, forced: FORCED }, {
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Iterator: IteratorConstructor
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});
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