Find Files in Google Drive with Apps Script

You can specify the MIME Type of files that you wish to find in Google Drive and the script, using the getFilesByType() method, will list all the matching files.

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function searchFiles() {
  var results = [];
  var types = [MimeType.GOOGLE_SHEETS, MimeType.GOOGLE_DOCS];
  for (var t in types) {
    var files = DriveApp.getFilesByType(types[t]);
    while (files.hasNext()) {
      var file = files.next();
      results.push(file);
      Logger.log([file.getDateCreated(), file.getName(), file.getUrl()].join());
    }
  }
}