function ls(curdir:any):string {
    var buf = "";
    buf += "Files in the current directory:\n";
    //list only first level files
    for (var key in curdir) {
        //buf += key + "\n";
        //also print if it is a directory or file
        if (typeof curdir[key] == "string") {
            buf += key + " (file)\n";
        }
        else if (typeof curdir[key] == "object") {
            buf += key + " (directory)\n";
        }
        else {
            buf += key + " (unknown)\n";
        }
    }
    return buf;
}
export { ls };