19 lines
842 B
JavaScript
19 lines
842 B
JavaScript
'use strict';
|
|
var $ = require('../internals/export');
|
|
var toObject = require('../internals/to-object');
|
|
var isPrototypeOf = require('../internals/object-is-prototype-of');
|
|
var getAsyncIteratorFlattenable = require('../internals/get-async-iterator-flattenable');
|
|
var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
|
|
var WrapAsyncIterator = require('../internals/async-iterator-wrap');
|
|
|
|
// `AsyncIterator.from` method
|
|
// https://github.com/tc39/proposal-async-iterator-helpers
|
|
$({ target: 'AsyncIterator', stat: true, forced: true }, {
|
|
from: function from(O) {
|
|
var iteratorRecord = getAsyncIteratorFlattenable(typeof O == 'string' ? toObject(O) : O);
|
|
return isPrototypeOf(AsyncIteratorPrototype, iteratorRecord.iterator)
|
|
? iteratorRecord.iterator
|
|
: new WrapAsyncIterator(iteratorRecord);
|
|
}
|
|
});
|