[6a3a178] | 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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