Use WHATWG URL for url and email validation

Via universal-url as it covers far more edge cases such as IDNAs and IPv6 than a simple regex will.

const isEmail = email => {
  try {
    const url = new URL(`mailto:${email}`);
    return url.search === '';
  } catch (error) {
    return false;
  }
};

const isURL = url => {
  try {
    url = new URL(url);
    return url.protocol === 'http' || url.protocol === 'https' || url.protocol === 'ftp';
  } catch (error) {
    return false;
  }
};

[stevenvachon]

mailto:a@b is a valid URL as well, but I would think that a@:*&^: is not a valid email address. However: https://github.com/jsdom/whatwg-url/issues/98

universal-url is, to my knowledge, 100% TR46 compliant. universal-url-lite has two shims, one with incomplete TR46 and one that relies on the native browser implementation, which all are currently incomplete.

[stevenvachon]

That’s all I can think of at the moment.