/**
 * 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 was originally sourced from here, then remixed to add punycode support:
 * https://www.oreilly.com/library/view/regular-expressions-cookbook/9781449327453/ch08s15.html
 */
export declare function isValidDomain(hostname: string): boolean;
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