/**
 * Redis Session Persistence
 * Production-grade session storage for collaborative development
 */
import Redis from 'ioredis';
import { SessionPersistence } from './session-manager';
import { CollaborationSession, CodeChange } from './websocket-server';
export interface RedisSessionPersistenceOptions {
    redis?: Redis;
    redisUrl?: string;
    keyPrefix?: string;
    sessionTTL?: number;
    historyTTL?: number;
    maxHistoryItems?: number;
}
export declare class RedisSessionPersistence implements SessionPersistence {
    private redis;
    private keyPrefix;
    private sessionTTL;
    private historyTTL;
    private maxHistoryItems;
    constructor(options?: RedisSessionPersistenceOptions);
    private setupEventHandlers;
    saveSession(session: CollaborationSession): Promise<void>;
    loadSession(sessionId: string): Promise<CollaborationSession | null>;
    deleteSession(sessionId: string): Promise<void>;
    listSessions(userId?: string): Promise<CollaborationSession[]>;
    saveCodeHistory(sessionId: string, change: CodeChange): Promise<void>;
    getCodeHistory(sessionId: string, file?: string): Promise<CodeChange[]>;
    getSessionStats(): Promise<{
        totalSessions: number;
        activeSessions: number;
        totalUsers: number;
        memoryUsage: string;
    }>;
    cleanupExpiredSessions(): Promise<number>;
    shutdown(): Promise<void>;
    private getSessionKey;
    private getHistoryKey;
}
export default RedisSessionPersistence;
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