modified

node_modules/has-property-descriptors/index.js

@@ -0,0 +1,33 @@
+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var $defineProperty = GetIntrinsic('%Object.defineProperty%', true);
+
+var hasPropertyDescriptors = function hasPropertyDescriptors() {
+	if ($defineProperty) {
+		try {
+			$defineProperty({}, 'a', { value: 1 });
+			return true;
+		} catch (e) {
+			// IE 8 has a broken defineProperty
+			return false;
+		}
+	}
+	return false;
+};
+
+hasPropertyDescriptors.hasArrayLengthDefineBug = function hasArrayLengthDefineBug() {
+	// node v0.6 has a bug where array lengths can be Set but not Defined
+	if (!hasPropertyDescriptors()) {
+		return null;
+	}
+	try {
+		return $defineProperty([], 'length', { value: 1 }).length !== 1;
+	} catch (e) {
+		// In Firefox 4-22, defining length on an array throws an exception.
+		return true;
+	}
+};
+
+module.exports = hasPropertyDescriptors;