1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var call = require('../internals/function-call');
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4 | var anObject = require('../internals/an-object');
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5 | var getIteratorDirect = require('../internals/get-iterator-direct');
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6 | var notANaN = require('../internals/not-a-nan');
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7 | var toPositiveInteger = require('../internals/to-positive-integer');
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8 | var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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9 | var createIterResultObject = require('../internals/create-iter-result-object');
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10 | var IS_PURE = require('../internals/is-pure');
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11 |
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12 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise) {
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13 | var state = this;
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14 |
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15 | return new Promise(function (resolve, reject) {
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16 | var doneAndReject = function (error) {
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17 | state.done = true;
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18 | reject(error);
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19 | };
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20 |
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21 | var loop = function () {
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22 | try {
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23 | Promise.resolve(anObject(call(state.next, state.iterator))).then(function (step) {
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24 | try {
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25 | if (anObject(step).done) {
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26 | state.done = true;
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27 | resolve(createIterResultObject(undefined, true));
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28 | } else if (state.remaining) {
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29 | state.remaining--;
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30 | loop();
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31 | } else resolve(createIterResultObject(step.value, false));
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32 | } catch (err) { doneAndReject(err); }
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33 | }, doneAndReject);
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34 | } catch (error) { doneAndReject(error); }
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35 | };
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36 |
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37 | loop();
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38 | });
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39 | });
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40 |
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41 |
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42 |
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43 | $({ target: 'AsyncIterator', proto: true, real: true, forced: IS_PURE }, {
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44 | drop: function drop(limit) {
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45 | anObject(this);
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46 | var remaining = toPositiveInteger(notANaN(+limit));
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47 | return new AsyncIteratorProxy(getIteratorDirect(this), {
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48 | remaining: remaining
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49 | });
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50 | }
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51 | });
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