This content is part of a third party extension that is not supported by the Cake project. For more information about this extension see Cake.Watch.

public static void Watch(this ICakeContext context, string pattern, Action<IEnumerable<FileChange>> fileChanged)

Watch("*.html", changes => {
    changes.ToList().ForEach(change => {
        Console.WriteLine(change.FullPath);        
    });
});