source: imaps-frontend/node_modules/es-abstract/2018/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/9.0/#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 new $Promise(function (resolve) {
                var ret = GetMethod(iterator, 'return'); // step 4

                if (typeof ret === 'undefined') {
                        resolve(completion); // step 5
                } else {
                        resolve($then(
                                new $Promise(function (resolve2) {
                                        // process.exit(42);
                                        resolve2(Call(ret, iterator, [])); // step 6
                                }),
                                function (innerResult) {
                                        if (Type(innerResult) !== 'Object') {
                                                throw new $TypeError('`innerResult` must be an Object'); // step 10
                                        }
                                        return completion;
                                },
                                function (e) {
                                        if (completion.type() === 'throw') {
                                                completion['?'](); // step 8
                                        } else {
                                                throw e; // step 9
                                        }
                                }
                        ));
                }
        });
};