source: imaps-frontend/node_modules/es-iterator-helpers/aos/GetIteratorFlattenable.js@ 0c6b92a

'use strict';

var $TypeError = require('es-errors/type');

var AdvanceStringIndex = require('es-abstract/2024/AdvanceStringIndex');
var Call = require('es-abstract/2024/Call');
var GetIteratorDirect = require('./GetIteratorDirect');
var GetMethod = require('es-abstract/2024/GetMethod');
var IsArray = require('es-abstract/2024/IsArray');
var Type = require('es-abstract/2024/Type');

var getIteratorMethod = require('es-abstract/helpers/getIteratorMethod');

// https://tc39.es/proposal-iterator-helpers/#sec-getiteratorflattenable

module.exports = function GetIteratorFlattenable(obj, stringHandling) {
        if (stringHandling !== 'REJECT-STRINGS' && stringHandling !== 'ITERATE-STRINGS') {
                throw new $TypeError('Assertion failed: `stringHandling` must be "REJECT-STRINGS" or "ITERATE-STRINGS"');
        }

        if (Type(obj) !== 'Object') {
                if (stringHandling === 'REJECT-STRINGS' || typeof obj !== 'string') {
                        throw new $TypeError('obj must be an Object'); // step 1.a
                }
        }

        var method = void undefined; // step 2

        // method = GetMethod(obj, Symbol.iterator); // step 5.a
        method = getIteratorMethod(
                {
                        AdvanceStringIndex: AdvanceStringIndex,
                        GetMethod: GetMethod,
                        IsArray: IsArray
                },
                obj
        );

        var iterator;
        if (typeof method === 'undefined') { // step 3
                iterator = obj; // step 3.a
        } else { // step 4
                iterator = Call(method, obj); // step 4.a
        }

        if (Type(iterator) !== 'Object') {
                throw new $TypeError('iterator must be an Object'); // step 5
        }
        return GetIteratorDirect(iterator); // step 6
};