--- /dev/null
+var $ = require('../internals/export');
+var fails = require('../internals/fails');
+var isObject = require('../internals/is-object');
+
+var nativeIsExtensible = Object.isExtensible;
+var FAILS_ON_PRIMITIVES = fails(function () { nativeIsExtensible(1); });
+
+// `Object.isExtensible` method
+// https://tc39.es/ecma262/#sec-object.isextensible
+$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {
+ isExtensible: function isExtensible(it) {
+ return isObject(it) ? nativeIsExtensible ? nativeIsExtensible(it) : true : false;
+ }
+});