import { HttpPlugin, HttpApp, RequestMethod } from '../types';
import { Logger } from '../../../common';
export interface HealthCheckOptions {
    path?: string;
    method?: RequestMethod;
    checks?: HealthCheck[];
    timeout?: number;
    responseFormat?: 'json' | 'text';
}
export interface HealthCheck {
    name: string;
    check: () => Promise<HealthCheckResult> | HealthCheckResult;
    timeout?: number;
    critical?: boolean;
}
export interface HealthCheckResult {
    status: 'healthy' | 'unhealthy' | 'degraded';
    message?: string;
    data?: any;
    timestamp?: string;
}
export interface HealthCheckResponse {
    status: 'ok' | 'error' | 'degraded';
    timestamp: string;
    uptime: number;
    checks: Record<string, HealthCheckResult>;
    version?: string;
    environment?: string;
}
export declare class HealthCheckPlugin implements HttpPlugin {
    readonly name = "health-check";
    private options;
    private startTime;
    private logger;
    constructor(options?: HealthCheckOptions, logger?: Logger);
    install<Framework>(app: HttpApp<Framework>, options?: Record<string, any>): Promise<void>;
    uninstall<Framework>(app: HttpApp<Framework>): void;
    beforeStart<Framework>(app: HttpApp<Framework>): void;
    afterStart<Framework>(app: HttpApp<Framework>): void;
    beforeStop<Framework>(app: HttpApp<Framework>): void;
    afterStop<Framework>(app: HttpApp<Framework>): void;
    gracefulShutdown<Framework>(app: HttpApp<Framework>, signals?: string[]): Promise<void>;
    addHealthCheck(check: HealthCheck): void;
    removeHealthCheck(name: string): void;
    getHealthChecks(): HealthCheck[];
    private addDefaultHealthChecks;
    private registerHealthCheckRoute;
    private performHealthChecks;
    private runHealthCheck;
    private formatTextResponse;
}