source: frontend/node_modules/es-abstract/2025/GetIteratorFlattenable.js

'use strict';

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

var AdvanceStringIndex = require('./AdvanceStringIndex');
var Call = require('./Call');
var GetIteratorDirect = require('./GetIteratorDirect');
var GetMethod = require('./GetMethod');
var IsArray = require('./IsArray');

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

// https://262.ecma-international.org/16.0/#sec-getiteratorflattenable

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

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

        // var method = GetMethod(obj, Symbol.iterator); // step 2
        var 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 (!isObject(iterator)) {
                throw new $TypeError('iterator must be an Object'); // step 5
        }
        return GetIteratorDirect(iterator); // step 6
};