/**
 * TLS certificate expiry diagnostic check.
 *
 * Reads a TLS certificate from the configured path and checks
 * the not-after date. Warns if expiring within 30 days, fails if expired.
 */
import type { DiagnosticDeps, DiagnosticResult } from '../types.js';
export declare function checkCertificateExpiry(deps: DiagnosticDeps): Promise<DiagnosticResult>;
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