/**
 * Shared URL helpers.
 */
/**
 * True when `url`'s hostname is exactly `domain` or a subdomain of it.
 * Avoids substring/suffix checks like `hostname.endsWith("senate.gov")`,
 * which also match look-alikes such as `evilsenate.gov`.
 * Returns false for missing or unparseable URLs.
 */
export declare function isHostOrSubdomain(url: string | URL | null | undefined, domain: string): boolean;
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