JSFileApi

var dir = new File("/path"); // /path on unix
var subdir = new File(dir, "name.txt") // /path/name.txt on unix

//readdir throws an exception if it isn't a directory
for each [file,type] in file.readdir() {
 // here type is a directory|file.
 i = file.stat()
 // i = { size: 1, lastModified:...}
}