/**
 * Koa Server Adapter
 * Server adapter implementation using Koa framework
 * Koa is known for its elegant middleware composition using async/await
 */
import type { NeuroLink } from "../../neurolink.js";
import { BaseServerAdapter } from "../abstract/baseServerAdapter.js";
import type { MiddlewareDefinition, RouteDefinition, ServerAdapterConfig } from "../../types/index.js";
/**
 * Koa-specific server adapter
 * Leverages Koa's middleware composition for clean request handling
 */
export declare class KoaServerAdapter extends BaseServerAdapter {
    private app;
    private router;
    private server?;
    private frameworkInitialized;
    private rateLimitStore;
    private rateLimitCleanupInterval?;
    private sockets;
    constructor(neurolink: NeuroLink, config?: ServerAdapterConfig);
    /**
     * Initialize Koa framework
     * Called by base class but actual initialization happens in initializeFrameworkAsync
     */
    protected initializeFramework(): void;
    /**
     * Initialize Koa framework with async imports
     */
    private initializeFrameworkAsync;
    /**
     * Create rate limiter middleware for Koa
     */
    private createRateLimiter;
    /**
     * Periodically clean up expired rate limit entries
     */
    private cleanupRateLimitStore;
    /**
     * Override initialize to ensure async framework setup
     */
    initialize(): Promise<void>;
    /**
     * Register route with Koa
     */
    protected registerFrameworkRoute(route: RouteDefinition): void;
    /**
     * Handle streaming response using Server-Sent Events
     */
    private handleStreamingResponse;
    /**
     * Register middleware with Koa
     */
    protected registerFrameworkMiddleware(middleware: MiddlewareDefinition): void;
    /**
     * Start the Koa server
     */
    start(): Promise<void>;
    /**
     * Stop the Koa server with graceful shutdown
     */
    stop(): Promise<void>;
    /**
     * Stop accepting new connections
     */
    protected stopAcceptingConnections(): Promise<void>;
    /**
     * Close the underlying server
     */
    protected closeServer(): Promise<void>;
    /**
     * Force close all active connections
     */
    protected forceCloseConnections(): Promise<void>;
    /**
     * Get the Koa app instance
     */
    getFrameworkInstance(): unknown;
}