Doing TDD with OpenFL and detecting file changes

Is there a Haxe tool which can detect file changes? In other projects I have used Ruby’s Guard or with JS I have used Grunts plug-in to achieve this.

Anyone know if I can do this using Haxe?

… Edit
A while back I wrote this Guardfile for MUnit.

In our tools, we detect based on the file modified date. I’d like to have some kind of file watcher, so we could automatically deploy changes for live asset reloading and other-such workflows. I think that file watching is largely platform-specific, so I’ve held off until there’s a bigger push/effort to support this cleanly cross-platform