source: imaps-frontend/node_modules/es-abstract/2023/GetIterator.js@ 79a0317

'use strict';

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

var $TypeError = require('es-errors/type');
var $asyncIterator = GetIntrinsic('%Symbol.asyncIterator%', true);

var inspect = require('object-inspect');
var hasSymbols = require('has-symbols')();

var AdvanceStringIndex = require('./AdvanceStringIndex');
var CreateAsyncFromSyncIterator = require('./CreateAsyncFromSyncIterator');
var GetIteratorFromMethod = require('./GetIteratorFromMethod');
var GetMethod = require('./GetMethod');
var IsArray = require('./IsArray');

var getIteratorMethod = require('../helpers/getIteratorMethod');

var ES = {
        AdvanceStringIndex: AdvanceStringIndex,
        GetMethod: GetMethod,
        IsArray: IsArray
};

// https://262.ecma-international.org/14.0/#sec-getiterator

module.exports = function GetIterator(obj, kind) {
        if (kind !== 'sync' && kind !== 'async') {
                throw new $TypeError("Assertion failed: `kind` must be one of 'sync' or 'async', got " + inspect(kind));
        }

        var method;
        if (kind === 'async') { // step 1
                if (hasSymbols && $asyncIterator) {
                        method = GetMethod(obj, $asyncIterator); // step 1.a
                }
        }
        if (typeof method === 'undefined') { // step 1.b
                // var syncMethod = GetMethod(obj, $iterator); // step 1.b.i
                var syncMethod = getIteratorMethod(ES, obj);
                if (kind === 'async') {
                        if (typeof syncMethod === 'undefined') {
                                throw new $TypeError('iterator method is `undefined`'); // step 1.b.ii
                        }
                        var syncIteratorRecord = GetIteratorFromMethod(obj, syncMethod); // step 1.b.iii
                        return CreateAsyncFromSyncIterator(syncIteratorRecord); // step 1.b.iv
                }
                method = syncMethod; // step 2, kind of
        }

        if (typeof method === 'undefined') {
                throw new $TypeError('iterator method is `undefined`'); // step 3
        }
        return GetIteratorFromMethod(obj, method); // step 4
};