46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $SyntaxError = GetIntrinsic('%SyntaxError%');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $Promise = GetIntrinsic('%Promise%', true);
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var callBound = require('call-bind/callBound');
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var CreateIterResultObject = require('./CreateIterResultObject');
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var IteratorComplete = require('./IteratorComplete');
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var IteratorValue = require('./IteratorValue');
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var PromiseResolve = require('./PromiseResolve');
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var Type = require('./Type');
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var $then = callBound('Promise.prototype.then', true);
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// https://262.ecma-international.org/10.0/#sec-asyncfromsynciteratorcontinuation
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module.exports = function AsyncFromSyncIteratorContinuation(result) {
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if (Type(result) !== 'Object') {
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throw new $TypeError('Assertion failed: Type(O) is not Object');
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}
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if (arguments.length > 1) {
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throw new $SyntaxError('although AsyncFromSyncIteratorContinuation should take a second argument, it is not used in this implementation');
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}
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if (!$Promise) {
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throw new $SyntaxError('This environment does not support Promises.');
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}
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return new Promise(function (resolve) {
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var done = IteratorComplete(result); // step 2
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var value = IteratorValue(result); // step 4
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var valueWrapper = PromiseResolve($Promise, value); // step 6
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// eslint-disable-next-line no-shadow
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var onFulfilled = function (value) { // steps 8-9
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return CreateIterResultObject(value, done); // step 8.a
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};
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resolve($then(valueWrapper, onFulfilled)); // step 11
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}); // step 12
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};
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