module.exports = function (file, api, options) {
  const { source, path } = file;
  // `source` is the source code in file at `path`

  const { jscodeshift, stats } = api;
  // use `jscodeshift` to access the API
  // `stats` is a function to collect statistics
  // during --dry runs

  // do some magic here...

  // return the changed source as string
  return source;
};