function getFilesInDirSync(pathToDir, files = []) {
  const dirContents = fs.readdirSync(pathToDir);
  return files.concat(dirContents.map(item => {
    const isDir = fs.statSync(pathToDir + item).isDirectory()
    return isDir ? getFilesInDirSync(`${pathToDir}/{item}`, files) : [`${pathToDir}/{item}`]
  }))
})