function serialize(name, val, options) {
  var opt = options || {};
  var enc = opt.encode || encode;

  if (typeof enc !== 'function') {
    throw new TypeError('option encode is invalid');
  }

  if (!fieldContentRegExp.test(name)) {
    throw new TypeError('argument name is invalid');
  }

  var value = enc(val);

  if (value && !fieldContentRegExp.test(value)) {
    throw new TypeError('argument val is invalid');
  }

  var str = name + '=' + value;

  if (null != opt.maxAge) {
    var maxAge = opt.maxAge - 0;
    if (isNaN(maxAge)) throw new Error('maxAge should be a Number');
    str += '; Max-Age=' + Math.floor(maxAge);
  }

  if (opt.domain) {
    if (!fieldContentRegExp.test(opt.domain)) {
      throw new TypeError('option domain is invalid');
    }

    str += '; Domain=' + opt.domain;
  }

  if (opt.path) {
    if (!fieldContentRegExp.test(opt.path)) {
      throw new TypeError('option path is invalid');
    }

    str += '; Path=' + opt.path;
  }

  if (opt.expires) {
    if (typeof opt.expires.toUTCString !== 'function') {
      throw new TypeError('option expires is invalid');
    }

    str += '; Expires=' + opt.expires.toUTCString();
  }

  if (opt.httpOnly) {
    str += '; HttpOnly';
  }

  if (opt.secure) {
    str += '; Secure';
  }

  if (opt.sameSite) {
    var sameSite = typeof opt.sameSite === 'string'
      ? opt.sameSite.toLowerCase() : opt.sameSite;

    switch (sameSite) {
      case true:
        str += '; SameSite=Strict';
        break;
      case 'lax':
        str += '; SameSite=Lax';
        break;
      case 'strict':
        str += '; SameSite=Strict';
        break;
      case 'none':
        str += '; SameSite=None';
        break;
      default:
        throw new TypeError('option sameSite is invalid');
    }
  }

  return str;
}
Serialize data into a cookie header.

Serialize the a name value pair into a cookie string suitable for
http headers. An optional options object specified cookie parameters.

serialize('foo', 'bar', { httpOnly: true })
  => "foo=bar; httpOnly"

@param {string} name
@param {string} val
@param {object} [options]
@return {string}
@public