1 | 'use strict';
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2 | // https://github.com/tc39/proposal-iterator-helpers
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3 | var $ = require('../internals/export');
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4 | var global = require('../internals/global');
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5 | var anInstance = require('../internals/an-instance');
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6 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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7 | var fails = require('../internals/fails');
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8 | var has = require('../internals/has');
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9 | var wellKnownSymbol = require('../internals/well-known-symbol');
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10 | var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
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11 | var IS_PURE = require('../internals/is-pure');
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12 |
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13 | var ITERATOR = wellKnownSymbol('iterator');
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14 | var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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15 |
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16 | var NativeIterator = global.Iterator;
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17 |
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18 | // FF56- have non-standard global helper `Iterator`
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19 | var FORCED = IS_PURE
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20 | || typeof NativeIterator != 'function'
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21 | || NativeIterator.prototype !== IteratorPrototype
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22 | // FF44- non-standard `Iterator` passes previous tests
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23 | || !fails(function () { NativeIterator({}); });
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24 |
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25 | var IteratorConstructor = function Iterator() {
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26 | anInstance(this, IteratorConstructor);
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27 | };
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28 |
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29 | if (IS_PURE) {
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30 | IteratorPrototype = {};
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31 | createNonEnumerableProperty(IteratorPrototype, ITERATOR, function () {
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32 | return this;
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33 | });
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34 | }
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35 |
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36 | if (!has(IteratorPrototype, TO_STRING_TAG)) {
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37 | createNonEnumerableProperty(IteratorPrototype, TO_STRING_TAG, 'Iterator');
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38 | }
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39 |
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40 | if (FORCED || !has(IteratorPrototype, 'constructor') || IteratorPrototype.constructor === Object) {
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41 | createNonEnumerableProperty(IteratorPrototype, 'constructor', IteratorConstructor);
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42 | }
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43 |
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44 | IteratorConstructor.prototype = IteratorPrototype;
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45 |
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46 | $({ global: true, forced: FORCED }, {
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47 | Iterator: IteratorConstructor
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48 | });
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