Recursively return folders in Node.js

get_folders.js

const getFolders = (dir) => {
  const paths = [dir];
  const scan = (dir) => {
    fs.readdirSync(dir).forEach((item) => {
      if (fs.statSync(path.join(dir, item)).isDirectory()) {
        const subdir = `${dir + item}/`;
        paths.push(subdir);
        scan(subdir);
      }
    });
  };
  scan(dir);
  return paths;
};