var global = require('../internals/global');
+var isCallable = require('../internals/is-callable');
var inspectSource = require('../internals/inspect-source');
var WeakMap = global.WeakMap;
-module.exports = typeof WeakMap === 'function' && /native code/.test(inspectSource(WeakMap));
+module.exports = isCallable(WeakMap) && /native code/.test(inspectSource(WeakMap));