| 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'); |
| |
| var nativePreventExtensions = Object.preventExtensions; |
| var FAILS_ON_PRIMITIVES = fails(function () { nativePreventExtensions(1); }); |
| |
| // `Object.preventExtensions` method |
| // https://tc39.github.io/ecma262/#sec-object.preventextensions |
| $({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES, sham: !FREEZING }, { |
| preventExtensions: function preventExtensions(it) { |
| return nativePreventExtensions && isObject(it) ? nativePreventExtensions(onFreeze(it)) : it; |
| } |
| }); |