import type { AggregateHealth, HealthCheck, HealthRegistry } from '../types/observability.js';
/**
 * Aggregates registered health checks. Worst status wins — one unhealthy check
 * makes the whole system unhealthy. Use timeouts so a slow probe can't stall
 * the response.
 */
export declare class DefaultHealthRegistry implements HealthRegistry {
    private checks;
    private readonly timeoutMs;
    constructor(opts?: {
        timeoutMs?: number | undefined;
    });
    register(check: HealthCheck): void;
    unregister(name: string): void;
    run(): Promise<AggregateHealth>;
    private runOne;
}
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