changing eps to ai automatically by a script

I came across this while searching for similar solutions. Anyway, I added a few scripts to prompt the user to select whether they want to delete the original .eps files after all convert are complete.

var api = {
  getFiles: function (fo, aExtensions, bRecursive, aFiles, includeFolder) {
    var exts = aExtensions ? aExtensions.join('|') : '.+';
    var pattern = new RegExp('\\.(' + exts + ')$');
    !aFiles && (aFiles = []);
    var filterFunction = function (file) {
      return pattern.test(file.name);
    };

    if (bRecursive && fo.name.indexOf('.') != 0) {
      var foFiles = fo.getFiles();
      while ((f = foFiles.shift())) {
        if (f instanceof Folder) {
          if (includeFolder === true) aFiles[aFiles.length] = f;
          this.getFiles(f, aExtensions, true, aFiles);
        }
        if (f instanceof File && pattern.test(f.name) && f.name != '.DS_Store') {
          aFiles[aFiles.length] = f;
        }
      }
      return aFiles;
    } else {
      return fo.getFiles(filterFunction);
    }
  },

  deleteFiles: function (files) {
    for (var i = 0; i < files.length; i++) {
      files[i].remove();
    }
  },
};

// Main routine
var main = function () {
  var fo = Folder.selectDialog('Please select a folder'),
    files,
    n = 0,
    doc,
    nFile,
    opts = new IllustratorSaveOptions();
  // Settings options
  // opts.… = …

  // Exit if no selected folder
  if (!fo) return;

  // Getting AI files
  files = api.getFiles(fo, ['eps'], true);
  n = files.length;

  // Exit if no files found
  if (!n) {
    alert('No files found, sorry');
    return;
  }

  // Convert found files
  while (n--) {
    nFile = files[n];
    doc = app.open(nFile);
    doc.saveAs(File(nFile.parent + '/' + nFile.name.replace(/\.eps$/, '.ai')), opts);
    doc.close();
  }

  // Ask if the user wants to delete the original .eps files
  if (confirm('Do you want to delete the original .eps files?')) {
    api.deleteFiles(files);
  }
};

// Run
main();