var walkSync = function(dir, recurse, filelist) {
  var fs = fs || require('fs'),
      files = fs.readdirSync(dir);
  
  filelist = filelist || [];
  recurse = recurse || false;

  files.forEach(function(file) {
    if (fs.statSync(dir + file).isDirectory()) {
      if(recurse){
        filelist = walkSync(dir + file + '/', recurse, filelist);
      }
    }
    else {
      filelist.push(dir+file);
    }
  });
  return filelist;
};

console.log(walkSync("./", true));