npm and error messages

node_modules/es5-ext/function/invoke.js

@@ -0,0 +1,15 @@
+"use strict";
+
+var isCallable = require("../object/is-callable")
+  , value      = require("../object/valid-value")
+
+  , slice = Array.prototype.slice, apply = Function.prototype.apply;
+
+module.exports = function (name/*, …args*/) {
+	var args = slice.call(arguments, 1), isFn = isCallable(name);
+	return function (obj) {
+		value(obj);
+		return apply.call(isFn ? name : obj[name], obj,
+			args.concat(slice.call(arguments, 1)));
+	};
+};