import type { OnApplicationShutdown, OnModuleDestroy } from '@nestjs/common';
import type { Response } from 'express';
import type { MastraModuleOptions } from '../mastra.module.js';
/**
 * Service that manages graceful shutdown.
 * Tracks in-flight requests and waits for them to complete before shutdown.
 */
export declare class ShutdownService implements OnModuleDestroy, OnApplicationShutdown {
    private readonly options;
    private readonly logger;
    private readonly activeRequests;
    private readonly sseClients;
    private isShuttingDown;
    private shutdownResolve;
    constructor(options: MastraModuleOptions);
    /**
     * Check if the service is shutting down.
     * Use this to reject new requests during shutdown.
     */
    get shuttingDown(): boolean;
    /**
     * Get the number of active requests.
     */
    get activeRequestCount(): number;
    /**
     * Register a new request.
     * Returns a unique request ID for tracking.
     */
    registerRequest(path: string): string;
    /**
     * Mark a request as complete.
     */
    completeRequest(requestId: string): void;
    /**
     * Register an SSE client for shutdown notifications.
     * Returns an unregister function.
     */
    registerSseClient(response: Response): () => void;
    /**
     * Notify all connected SSE clients about shutdown.
     */
    notifySseClients(): void;
    /**
     * Called when the module is being destroyed.
     * Marks the service as shutting down.
     */
    onModuleDestroy(): void;
    /**
     * Called when the application is shutting down.
     * Waits for in-flight requests to complete.
     */
    onApplicationShutdown(signal?: string): Promise<void>;
}
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