function file(options, callback) {
  const
    args = _parseArguments(options, callback),
    opts = args[0],
    cb = args[1];

  // gets a temporary filename
  tmpName(opts, function _tmpNameCreated(err, name) {
    /* istanbul ignore else */
    if (err) return cb(err);

    // create and open the file
    fs.open(name, CREATE_FLAGS, opts.mode || FILE_MODE, function _fileCreated(err, fd) {
      /* istanbu ignore else */
      if (err) return cb(err);

      if (opts.discardDescriptor) {
        return fs.close(fd, function _discardCallback(possibleErr) {
          // the chance of getting an error on close here is rather low and might occur in the most edgiest cases only
          return cb(possibleErr, name, undefined, _prepareTmpFileRemoveCallback(name, -1, opts, false));
        });
      } else {
        // detachDescriptor passes the descriptor whereas discardDescriptor closes it, either way, we no longer care
        // about the descriptor
        const discardOrDetachDescriptor = opts.discardDescriptor || opts.detachDescriptor;
        cb(null, name, fd, _prepareTmpFileRemoveCallback(name, discardOrDetachDescriptor ? -1 : fd, opts, false));
      }
    });
  });
}
Creates and opens a temporary file.

@param {(Options|null|undefined|fileCallback)} options the config options or the callback function or null or undefined
@param {?fileCallback} callback