source: imaps-frontend/node_modules/es-abstract/2016/TestIntegrityLevel.js@ 79a0317

'use strict';

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

var every = require('../helpers/every');
var OwnPropertyKeys = require('own-keys');

var IsDataDescriptor = require('./IsDataDescriptor');
var IsExtensible = require('./IsExtensible');
var ToPropertyDescriptor = require('./ToPropertyDescriptor');

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

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

module.exports = function TestIntegrityLevel(O, level) {
        if (!isObject(O)) {
                throw new $TypeError('Assertion failed: Type(O) is not Object');
        }
        if (level !== 'sealed' && level !== 'frozen') {
                throw new $TypeError('Assertion failed: `level` must be `"sealed"` or `"frozen"`');
        }
        var status = IsExtensible(O);
        if (status || !$gOPD) {
                return false;
        }
        var theKeys = OwnPropertyKeys(O);
        return theKeys.length === 0 || every(theKeys, function (k) {
                var currentDesc = $gOPD(O, k);
                if (typeof currentDesc !== 'undefined') {
                        if (currentDesc.configurable) {
                                return false;
                        }
                        if (level === 'frozen' && IsDataDescriptor(ToPropertyDescriptor(currentDesc)) && currentDesc.writable) {
                                return false;
                        }
                }
                return true;
        });
};