1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var global = require('../internals/global');
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4 | var anInstance = require('../internals/an-instance');
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5 | var anObject = require('../internals/an-object');
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6 | var isCallable = require('../internals/is-callable');
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7 | var getPrototypeOf = require('../internals/object-get-prototype-of');
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8 | var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
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9 | var createProperty = require('../internals/create-property');
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10 | var fails = require('../internals/fails');
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11 | var hasOwn = require('../internals/has-own-property');
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12 | var wellKnownSymbol = require('../internals/well-known-symbol');
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13 | var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
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14 | var DESCRIPTORS = require('../internals/descriptors');
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15 | var IS_PURE = require('../internals/is-pure');
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16 |
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17 | var CONSTRUCTOR = 'constructor';
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18 | var ITERATOR = 'Iterator';
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19 | var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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20 |
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21 | var $TypeError = TypeError;
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22 | var NativeIterator = global[ITERATOR];
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23 |
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24 |
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25 | var FORCED = IS_PURE
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26 | || !isCallable(NativeIterator)
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27 | || NativeIterator.prototype !== IteratorPrototype
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28 |
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29 | || !fails(function () { NativeIterator({}); });
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30 |
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31 | var IteratorConstructor = function Iterator() {
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32 | anInstance(this, IteratorPrototype);
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33 | if (getPrototypeOf(this) === IteratorPrototype) throw new $TypeError('Abstract class Iterator not directly constructable');
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34 | };
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35 |
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36 | var defineIteratorPrototypeAccessor = function (key, value) {
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37 | if (DESCRIPTORS) {
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38 | defineBuiltInAccessor(IteratorPrototype, key, {
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39 | configurable: true,
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40 | get: function () {
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41 | return value;
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42 | },
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43 | set: function (replacement) {
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44 | anObject(this);
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45 | if (this === IteratorPrototype) throw new $TypeError("You can't redefine this property");
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46 | if (hasOwn(this, key)) this[key] = replacement;
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47 | else createProperty(this, key, replacement);
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48 | }
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49 | });
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50 | } else IteratorPrototype[key] = value;
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51 | };
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52 |
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53 | if (!hasOwn(IteratorPrototype, TO_STRING_TAG)) defineIteratorPrototypeAccessor(TO_STRING_TAG, ITERATOR);
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54 |
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55 | if (FORCED || !hasOwn(IteratorPrototype, CONSTRUCTOR) || IteratorPrototype[CONSTRUCTOR] === Object) {
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56 | defineIteratorPrototypeAccessor(CONSTRUCTOR, IteratorConstructor);
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57 | }
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58 |
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59 | IteratorConstructor.prototype = IteratorPrototype;
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60 |
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61 |
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62 |
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63 | $({ global: true, constructor: true, forced: FORCED }, {
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64 | Iterator: IteratorConstructor
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65 | });
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