31 lines
1 KiB
JavaScript
31 lines
1 KiB
JavaScript
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// https://github.com/tc39/proposal-iterator-helpers
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var $ = require('../internals/export');
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var path = require('../internals/path');
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var aFunction = require('../internals/a-function');
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var anObject = require('../internals/an-object');
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var toObject = require('../internals/to-object');
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var createAsyncIteratorProxy = require('../internals/create-async-iterator-proxy');
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var getAsyncIteratorMethod = require('../internals/get-async-iterator-method');
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var AsyncIterator = path.AsyncIterator;
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var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg) {
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return anObject(this.next.call(this.iterator, arg));
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}, true);
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$({ target: 'AsyncIterator', stat: true }, {
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from: function from(O) {
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var object = toObject(O);
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var usingIterator = getAsyncIteratorMethod(object);
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var iterator;
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if (usingIterator != null) {
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iterator = aFunction(usingIterator).call(object);
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if (iterator instanceof AsyncIterator) return iterator;
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} else {
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iterator = object;
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} return new AsyncIteratorProxy({
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iterator: iterator
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});
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}
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});
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