So siehts ganz gut aus !

node_modules/es5-ext/boolean/index.js

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = {
+	isBoolean: require("./is-boolean")
+};

node_modules/es5-ext/boolean/is-boolean.js

@@ -0,0 +1,10 @@
+"use strict";
+
+var objToString = Object.prototype.toString, id = objToString.call(true);
+
+module.exports = function (value) {
+	return (
+		typeof value === "boolean" ||
+		(typeof value === "object" && (value instanceof Boolean || objToString.call(value) === id))
+	);
+};