/**
 * Health Check System
 *
 * Provides health and readiness checks for the application
 */
export type HealthStatus = 'healthy' | 'degraded' | 'unhealthy';
export interface HealthCheck {
    name: string;
    check: () => Promise<HealthCheckResult>;
    critical?: boolean;
    timeout?: number;
}
export interface HealthCheckResult {
    status: HealthStatus;
    message?: string;
    details?: Record<string, unknown>;
    duration?: number;
    timestamp?: string;
}
export interface SystemHealth {
    status: HealthStatus;
    checks: Record<string, HealthCheckResult>;
    timestamp: string;
    uptime: number;
    version?: string;
}
export declare class HealthCheckSystem {
    private checks;
    private startTime;
    /**
     * Register a health check
     */
    register(check: HealthCheck): void;
    /**
     * Unregister a health check
     */
    unregister(name: string): void;
    /**
     * Run all health checks
     */
    checkHealth(): Promise<SystemHealth>;
    /**
     * Run check with timeout
     */
    private runWithTimeout;
    /**
     * Get uptime in seconds
     */
    getUptime(): number;
}
/**
 * Default health check system
 */
export declare const healthCheck: HealthCheckSystem;
/**
 * Database health check
 */
export declare function createDatabaseHealthCheck(queryFn: () => Promise<void>): HealthCheck;
/**
 * Memory health check
 */
export declare function createMemoryHealthCheck(thresholdPercent?: number): HealthCheck;
/**
 * Disk health check
 */
export declare function createDiskHealthCheck(thresholdPercent?: number): HealthCheck;
/**
 * API endpoint health check
 */
export declare function createAPIHealthCheck(url: string, expectedStatus?: number): HealthCheck;
/**
 * Custom health check
 */
export declare function createCustomHealthCheck(name: string, checkFn: () => Promise<HealthCheckResult>, critical?: boolean): HealthCheck;
/**
 * Create health check endpoint handler
 */
export declare function createHealthEndpoint(): () => Promise<Response>;
/**
 * Create readiness check endpoint handler
 */
export declare function createReadinessEndpoint(): () => Promise<Response>;
/**
 * Create liveness check endpoint handler
 */
export declare function createLivenessEndpoint(): () => Response;
/**
 * Monitor health and log status changes
 */
export declare function monitorHealth(intervalMs?: number, onStatusChange?: (status: HealthStatus) => void): Promise<NodeJS.Timeout>;
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