npm and error messages

node_modules/es5-ext/function/#/not.js

@@ -0,0 +1,14 @@
+"use strict";
+
+var callable     = require("../../object/valid-callable")
+  , defineLength = require("../_define-length")
+
+  , apply = Function.prototype.apply;
+
+module.exports = function () {
+	var fn = callable(this);
+
+	return defineLength(function () {
+		return !apply.call(fn, this, arguments);
+	}, fn.length);
+};