69 lines
1.8 KiB
JavaScript
69 lines
1.8 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 Call = require('./Call');
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var CompletionRecord = require('./CompletionRecord');
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var GetMethod = require('./GetMethod');
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var Type = require('./Type');
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var assertRecord = require('../helpers/assertRecord');
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var callBound = require('call-bind/callBound');
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var $then = callBound('Promise.prototype.then', true);
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// https://262.ecma-international.org/12.0/#sec-asynciteratorclose
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module.exports = function AsyncIteratorClose(iteratorRecord, completion) {
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assertRecord(Type, 'Iterator Record', 'iteratorRecord', iteratorRecord); // step 1
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if (!(completion instanceof CompletionRecord)) {
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throw new $TypeError('Assertion failed: completion is not a Completion Record instance'); // step 2
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}
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if (!$then) {
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throw new $SyntaxError('This environment does not support Promises.');
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}
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var iterator = iteratorRecord['[[Iterator]]']; // step 3
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return $then(
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$then(
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$then(
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new $Promise(function (resolve) {
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resolve(GetMethod(iterator, 'return')); // step 4
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// resolve(Call(ret, iterator, [])); // step 6
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}),
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function (returnV) { // step 5.a
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if (typeof returnV === 'undefined') {
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return completion; // step 5.b
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}
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return Call(returnV, iterator); // step 5.c, 5.d.
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}
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),
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null,
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function (e) {
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if (completion.type() === 'throw') {
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completion['?'](); // step 6
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} else {
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throw e; // step 7
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}
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}
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),
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function (innerResult) { // step 8
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if (completion.type() === 'throw') {
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completion['?'](); // step 6
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}
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if (Type(innerResult) !== 'Object') {
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throw new $TypeError('`innerResult` must be an Object'); // step 10
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}
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return completion;
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}
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);
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};
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