function stringify (cookie) {
  if (cookie.name.length === 0) {
    return null
  }

  validateCookieName(cookie.name)
  validateCookieValue(cookie.value)

  const out = [`${cookie.name}=${cookie.value}`]

  // https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-cookie-prefixes-00#section-3.1
  // https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-cookie-prefixes-00#section-3.2
  if (cookie.name.startsWith('__Secure-')) {
    cookie.secure = true
  }

  if (cookie.name.startsWith('__Host-')) {
    cookie.secure = true
    cookie.domain = null
    cookie.path = '/'
  }

  if (cookie.secure) {
    out.push('Secure')
  }

  if (cookie.httpOnly) {
    out.push('HttpOnly')
  }

  if (typeof cookie.maxAge === 'number') {
    validateCookieMaxAge(cookie.maxAge)
    out.push(`Max-Age=${cookie.maxAge}`)
  }

  if (cookie.domain) {
    validateCookieDomain(cookie.domain)
    out.push(`Domain=${cookie.domain}`)
  }

  if (cookie.path) {
    validateCookiePath(cookie.path)
    out.push(`Path=${cookie.path}`)
  }

  if (cookie.expires && cookie.expires.toString() !== 'Invalid Date') {
    out.push(`Expires=${toIMFDate(cookie.expires)}`)
  }

  if (cookie.sameSite) {
    out.push(`SameSite=${cookie.sameSite}`)
  }

  for (const part of cookie.unparsed) {
    if (!part.includes('=')) {
      throw new Error('Invalid unparsed')
    }

    const [key, ...value] = part.split('=')

    out.push(`${key.trim()}=${value.join('=')}`)
  }

  return out.join('; ')
}
@see https://www.rfc-editor.org/rfc/rfc6265#section-4.1.1
@param {import('./index').Cookie} cookie