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+/*!
+ * static-extend <https://github.com/jonschlinkert/static-extend>
+ *
+ * Copyright (c) 2016, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+'use strict';
+
+var copy = require('object-copy');
+var define = require('define-property');
+var util = require('util');
+
+/**
+ * Returns a function for extending the static properties,
+ * prototype properties, and descriptors from the `Parent`
+ * constructor onto `Child` constructors.
+ *
+ * ```js
+ * var extend = require('static-extend');
+ * Parent.extend = extend(Parent);
+ *
+ * // optionally pass a custom merge function as the second arg
+ * Parent.extend = extend(Parent, function(Child) {
+ *   Child.prototype.mixin = function(key, val) {
+ *     Child.prototype[key] = val;
+ *   };
+ * });
+ *
+ * // extend "child" constructors
+ * Parent.extend(Child);
+ *
+ * // optionally define prototype methods as the second arg
+ * Parent.extend(Child, {
+ *   foo: function() {},
+ *   bar: function() {}
+ * });
+ * ```
+ * @param {Function} `Parent` Parent ctor
+ * @param {Function} `extendFn` Optional extend function for handling any necessary custom merging. Useful when updating methods that require a specific prototype.
+ *   @param {Function} `Child` Child ctor
+ *   @param {Object} `proto` Optionally pass additional prototype properties to inherit.
+ *   @return {Object}
+ * @api public
+ */
+
+function extend(Parent, extendFn) {
+  if (typeof Parent !== 'function') {
+    throw new TypeError('expected Parent to be a function.');
+  }
+
+  return function(Ctor, proto) {
+    if (typeof Ctor !== 'function') {
+      throw new TypeError('expected Ctor to be a function.');
+    }
+
+    util.inherits(Ctor, Parent);
+    copy(Ctor, Parent);
+
+    // proto can be null or a plain object
+    if (typeof proto === 'object') {
+      var obj = Object.create(proto);
+
+      for (var k in obj) {
+        Ctor.prototype[k] = obj[k];
+      }
+    }
+
+    // keep a reference to the parent prototype
+    define(Ctor.prototype, '_parent_', {
+      configurable: true,
+      set: function() {},
+      get: function() {
+        return Parent.prototype;
+      }
+    });
+
+    if (typeof extendFn === 'function') {
+      extendFn(Ctor, Parent);
+    }
+
+    Ctor.extend = extend(Ctor, extendFn);
+  };
+};
+
+/**
+ * Expose `extend`
+ */
+
+module.exports = extend;