1 var fails = require('../internals/fails');
2 var isObject = require('../internals/is-object');
3 var classof = require('../internals/classof-raw');
4 var ARRAY_BUFFER_NON_EXTENSIBLE = require('../internals/array-buffer-non-extensible');
6 // eslint-disable-next-line es/no-object-isextensible -- safe
7 var $isExtensible = Object.isExtensible;
8 var FAILS_ON_PRIMITIVES = fails(function () { $isExtensible(1); });
10 // `Object.isExtensible` method
11 // https://tc39.es/ecma262/#sec-object.isextensible
12 module.exports = (FAILS_ON_PRIMITIVES || ARRAY_BUFFER_NON_EXTENSIBLE) ? function isExtensible(it) {
13 if (!isObject(it)) return false;
14 if (ARRAY_BUFFER_NON_EXTENSIBLE && classof(it) == 'ArrayBuffer') return false;
15 return $isExtensible ? $isExtensible(it) : true;