1 | 'use strict';
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2 | var path = require('../internals/path');
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3 | var aFunction = require('../internals/a-function');
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4 | var anObject = require('../internals/an-object');
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5 | var create = require('../internals/object-create');
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6 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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7 | var redefineAll = require('../internals/redefine-all');
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8 | var wellKnownSymbol = require('../internals/well-known-symbol');
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9 | var InternalStateModule = require('../internals/internal-state');
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10 | var getBuiltIn = require('../internals/get-built-in');
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11 |
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12 | var Promise = getBuiltIn('Promise');
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13 |
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14 | var setInternalState = InternalStateModule.set;
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15 | var getInternalState = InternalStateModule.get;
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16 |
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17 | var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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18 |
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19 | var $return = function (value) {
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20 | var iterator = getInternalState(this).iterator;
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21 | var $$return = iterator['return'];
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22 | return $$return === undefined
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23 | ? Promise.resolve({ done: true, value: value })
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24 | : anObject($$return.call(iterator, value));
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25 | };
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26 |
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27 | var $throw = function (value) {
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28 | var iterator = getInternalState(this).iterator;
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29 | var $$throw = iterator['throw'];
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30 | return $$throw === undefined
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31 | ? Promise.reject(value)
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32 | : $$throw.call(iterator, value);
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33 | };
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34 |
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35 | module.exports = function (nextHandler, IS_ITERATOR) {
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36 | var AsyncIteratorProxy = function AsyncIterator(state) {
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37 | state.next = aFunction(state.iterator.next);
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38 | state.done = false;
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39 | setInternalState(this, state);
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40 | };
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41 |
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42 | AsyncIteratorProxy.prototype = redefineAll(create(path.AsyncIterator.prototype), {
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43 | next: function next(arg) {
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44 | var state = getInternalState(this);
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45 | if (state.done) return Promise.resolve({ done: true, value: undefined });
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46 | try {
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47 | return Promise.resolve(anObject(nextHandler.call(state, arg, Promise)));
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48 | } catch (error) {
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49 | return Promise.reject(error);
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50 | }
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51 | },
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52 | 'return': $return,
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53 | 'throw': $throw
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54 | });
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55 |
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56 | if (!IS_ITERATOR) {
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57 | createNonEnumerableProperty(AsyncIteratorProxy.prototype, TO_STRING_TAG, 'Generator');
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58 | }
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59 |
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60 | return AsyncIteratorProxy;
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61 | };
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