codemods_blog_1.js

const transformer = (file, api) => {
  /* get the jscodeshift helper */
  const j = api.jscodeshift;

  /* create a js object representation of your source code */
  const root = j(file.source);

  return root
    .find(/* grab the code you want to update */)
    .forEach(/* do something to it */)
    .toSource(/* return the newly printed code */);
};