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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 anObject = require('../internals/an-object');
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5 | var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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6 |
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7 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg, Promise) {
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8 | var state = this;
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9 | var iterator = state.iterator;
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10 |
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11 | return Promise.resolve(anObject(state.next.call(iterator, arg))).then(function (step) {
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12 | if (anObject(step).done) {
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13 | state.done = true;
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14 | return { done: true, value: undefined };
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15 | }
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16 | return { done: false, value: [state.index++, step.value] };
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17 | });
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18 | });
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19 |
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20 | $({ target: 'AsyncIterator', proto: true, real: true }, {
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21 | asIndexedPairs: function asIndexedPairs() {
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22 | return new AsyncIteratorProxy({
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23 | iterator: anObject(this),
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24 | index: 0
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25 | });
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26 | }
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27 | });
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