source: imaps-frontend/node_modules/es-abstract/2018/SpeciesConstructor.js@ 79a0317

'use strict';

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

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

var IsConstructor = require('./IsConstructor');

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

// https://262.ecma-international.org/6.0/#sec-speciesconstructor

module.exports = function SpeciesConstructor(O, defaultConstructor) {
        if (!isObject(O)) {
                throw new $TypeError('Assertion failed: Type(O) is not Object');
        }
        var C = O.constructor;
        if (typeof C === 'undefined') {
                return defaultConstructor;
        }
        if (!isObject(C)) {
                throw new $TypeError('O.constructor is not an Object');
        }
        var S = $species ? C[$species] : void 0;
        if (S == null) {
                return defaultConstructor;
        }
        if (IsConstructor(S)) {
                return S;
        }
        throw new $TypeError('no constructor found');
};