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type FilePathOptions = {  filename: string  root?: string  defaultDocument?: string}
export const getFilePath = (options: FilePathOptions): string | undefined => {  let filename = options.filename  const defaultDocument = options.defaultDocument || 'index.html'
  if (filename.endsWith('/')) {    // /top/ => /top/index.html    filename = filename.concat(defaultDocument)  } else if (!filename.match(/\.[a-zA-Z0-9]+$/)) {    // /top => /top/index.html    filename = filename.concat('/' + defaultDocument)  }
  const path = getFilePathWithoutDefaultDocument({    root: options.root,    filename,  })
  return path}
export const getFilePathWithoutDefaultDocument = (  options: Omit<FilePathOptions, 'defaultDocument'>) => {  let root = options.root || ''  let filename = options.filename
  if (/(?:^|[\/\\])\.\.(?:$|[\/\\])/.test(filename)) {    return  }
  // /foo.html => foo.html  filename = filename.replace(/^\.?[\/\\]/, '')
  // foo\bar.txt => foo/bar.txt  filename = filename.replace(/\\/, '/')
  // assets/ => assets  root = root.replace(/\/$/, '')
  // ./assets/foo.html => assets/foo.html  let path = root ? root + '/' + filename : filename  path = path.replace(/^\.?\//, '')
  return path}