How to use the memfs.fs.existsSync function in memfs

function rimraf(dirPath) {
  if (fs.existsSync(dirPath)) {
    fs.readdirSync(dirPath).forEach((entry) => {
      const entryPath = path.join(dirPath, entry);
      if (fs.lstatSync(entryPath).isDirectory()) {
        rimraf(entryPath);
      } else {
        fs.unlinkSync(entryPath);
      }
    });
    fs.rmdirSync(dirPath);
  }
}

dirNames.reduce((accumDir, currentdir) => {
    const jointDir = path.join(accumDir, currentdir);
    if (!fs.existsSync(jointDir)) {
      fs.mkdirSync(jointDir);
    }
    return jointDir;
  }, '');
}

fs.emptydirSync = (dir) => {
  if (!fs.existsSync(dir)) {
    createDir(dir);
  } else {
    rimraf(dir);
  }
};

files.forEach((file) => {
      const curSource = path.join(src, file);
      const curDest = path.join(dest, file);
      if (fs.lstatSync(curSource).isDirectory()) {
        if (!fs.existsSync(curDest)) {
          createDir(curDest);
        }
        copyDirSync(curSource, curDest);
      } else {
        copyFileSync(curSource, curDest);
      }
    });
  }