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/**
* A simple test to determine if a hostname is a properly-formatted domain name
*
* A "valid domain" is defined here: https://url.spec.whatwg.org/#valid-domain
*
* Regex sourced from here:
* https://www.oreilly.com/library/view/regular-expressions-cookbook/9781449327453/ch08s15.html
*/
export function isValidDomain(hostname: string): boolean {
return (
// Consider localhost valid as well since it's okay wrt Secure Contexts
hostname === 'localhost' || /^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$/i.test(hostname)
);
}
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