npm and error messages

node_modules/es5-ext/object/is-integer.js

@@ -0,0 +1,10 @@
+"use strict";
+
+var isInteger = require("../number/is-integer")
+  , isValue   = require("./is-value");
+
+module.exports = function (arg) {
+	if (!isValue(arg)) return false;
+	arg = Number(arg);
+	return isInteger(arg);
+};