--- /dev/null
+'use strict';
+var nativePropertyIsEnumerable = {}.propertyIsEnumerable;
+var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
+
+// Nashorn ~ JDK8 bug
+var NASHORN_BUG = getOwnPropertyDescriptor && !nativePropertyIsEnumerable.call({ 1: 2 }, 1);
+
+// `Object.prototype.propertyIsEnumerable` method implementation
+// https://tc39.github.io/ecma262/#sec-object.prototype.propertyisenumerable
+exports.f = NASHORN_BUG ? function propertyIsEnumerable(V) {
+ var descriptor = getOwnPropertyDescriptor(this, V);
+ return !!descriptor && descriptor.enumerable;
+} : nativePropertyIsEnumerable;