source: imaps-frontend/node_modules/es-abstract/2021/AsyncIteratorClose.js

'use strict';

var GetIntrinsic = require('get-intrinsic');

var $SyntaxError = require('es-errors/syntax');
var $TypeError = require('es-errors/type');
var $Promise = GetIntrinsic('%Promise%', true);

var Call = require('./Call');
var CompletionRecord = require('./CompletionRecord');
var GetMethod = require('./GetMethod');
var Type = require('./Type');

var isIteratorRecord = require('../helpers/records/iterator-record');

var callBound = require('call-bind/callBound');

var $then = callBound('Promise.prototype.then', true);

// https://262.ecma-international.org/12.0/#sec-asynciteratorclose

module.exports = function AsyncIteratorClose(iteratorRecord, completion) {
        if (!isIteratorRecord(iteratorRecord)) {
                throw new $TypeError('Assertion failed: `iteratorRecord` must be an Iterator Record'); // step 1
        }

        if (!(completion instanceof CompletionRecord)) {
                throw new $TypeError('Assertion failed: completion is not a Completion Record instance'); // step 2
        }

        if (!$then) {
                throw new $SyntaxError('This environment does not support Promises.');
        }

        var iterator = iteratorRecord['[[Iterator]]']; // step 3

        return $then(
                $then(
                        $then(
                                new $Promise(function (resolve) {
                                        resolve(GetMethod(iterator, 'return')); // step 4
                                        // resolve(Call(ret, iterator, [])); // step 6
                                }),
                                function (returnV) { // step 5.a
                                        if (typeof returnV === 'undefined') {
                                                return completion; // step 5.b
                                        }
                                        return Call(returnV, iterator); // step 5.c, 5.d.
                                }
                        ),
                        null,
                        function (e) {
                                if (completion.type() === 'throw') {
                                        completion['?'](); // step 6
                                } else {
                                        throw e; // step 7
                                }
                        }
                ),
                function (innerResult) { // step 8
                        if (completion.type() === 'throw') {
                                completion['?'](); // step 6
                        }
                        if (Type(innerResult) !== 'Object') {
                                throw new $TypeError('`innerResult` must be an Object'); // step 10
                        }
                        return completion;
                }
        );
};