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node_modules/is-extendable/index.js

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+/*!
+ * is-extendable <https://github.com/jonschlinkert/is-extendable>
+ *
+ * Copyright (c) 2015, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+'use strict';
+
+module.exports = function isExtendable(val) {
+  return typeof val !== 'undefined' && val !== null
+    && (typeof val === 'object' || typeof val === 'function');
+};