| 'use strict'; | 
| var $ = require('../internals/export'); | 
| var isObject = require('../internals/is-object'); | 
| var onFreeze = require('../internals/internal-metadata').onFreeze; | 
| var FREEZING = require('../internals/freezing'); | 
| var fails = require('../internals/fails'); | 
|   | 
| // eslint-disable-next-line es/no-object-preventextensions -- safe | 
| var $preventExtensions = Object.preventExtensions; | 
| var FAILS_ON_PRIMITIVES = fails(function () { $preventExtensions(1); }); | 
|   | 
| // `Object.preventExtensions` method | 
| // https://tc39.es/ecma262/#sec-object.preventextensions | 
| $({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES, sham: !FREEZING }, { | 
|   preventExtensions: function preventExtensions(it) { | 
|     return $preventExtensions && isObject(it) ? $preventExtensions(onFreeze(it)) : it; | 
|   } | 
| }); |