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1 | // https://github.com/tc39/proposal-iterator-helpers
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2 | var $ = require('../internals/export');
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3 | var path = require('../internals/path');
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4 | var aFunction = require('../internals/a-function');
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5 | var anObject = require('../internals/an-object');
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6 | var toObject = require('../internals/to-object');
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7 | var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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8 | var getAsyncIteratorMethod = require('../internals/get-async-iterator-method');
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9 |
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10 | var AsyncIterator = path.AsyncIterator;
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11 |
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12 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg) {
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13 | return anObject(this.next.call(this.iterator, arg));
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14 | }, true);
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15 |
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16 | $({ target: 'AsyncIterator', stat: true }, {
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17 | from: function from(O) {
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18 | var object = toObject(O);
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19 | var usingIterator = getAsyncIteratorMethod(object);
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20 | var iterator;
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21 | if (usingIterator != null) {
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22 | iterator = aFunction(usingIterator).call(object);
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23 | if (iterator instanceof AsyncIterator) return iterator;
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24 | } else {
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25 | iterator = object;
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26 | } return new AsyncIteratorProxy({
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27 | iterator: iterator
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28 | });
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29 | }
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30 | });
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