/**
 * Shared domain/hostname validation (8P.3, 8J.3, 8J.4).
 *
 * Validates a bare hostname like "example.com" — rejects URLs, ports,
 * wildcards, protocol prefixes, and enforces DNS label (63-char) and
 * hostname (253-char) length limits.
 *
 * The length limit is checked FIRST (fail-fast) so oversized input is
 * rejected before any pattern matching, and error messages never echo
 * the full oversized value.
 */
/**
 * Validate a domain string is a plausible hostname. Throws
 * `ValidationError` on invalid input.
 */
export declare function validateDomain(domain: string): void;
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