/**
 * Secure Client-Side Session Service
 *
 * Manages wallet sessions with cryptographically secure token generation
 * Uses Web Crypto API for secure random generation
 */
export interface WalletSession {
    walletAddress: string;
    merchantId: string;
    chainId: string;
    sessionToken: string;
    expiresAt: number;
    createdAt: number;
    lastActiveAt: number;
}
export interface SessionOptions {
    persistent?: boolean;
    ttl?: number;
}
export declare class SecureSessionService {
    private static readonly SESSION_KEY_PREFIX;
    private static readonly DEFAULT_TTL;
    /**
     * Generate cryptographically secure session token
     */
    private static generateSecureToken;
    /**
     * Create a new wallet session with secure token
     */
    static createSession(walletAddress: string, merchantId: string, chainId: string, options?: SessionOptions): Promise<WalletSession>;
    /**
     * Get current active session
     */
    static getSession(persistent?: boolean): WalletSession | null;
    /**
     * Get session by token
     */
    static getSessionByToken(sessionToken: string, persistent?: boolean): WalletSession | null;
    /**
     * Update session
     */
    static updateSession(sessionToken: string, updates: Partial<WalletSession>, persistent?: boolean): WalletSession | null;
    /**
     * Delete session
     */
    static deleteSession(sessionToken: string, persistent?: boolean): boolean;
    /**
     * Delete all sessions
     */
    static clearAllSessions(): void;
    /**
     * Delete sessions for a specific wallet address
     */
    static clearWalletSessions(walletAddress: string): void;
    /**
     * Check if user has active session
     */
    static hasActiveSession(): boolean;
    /**
     * Get all active sessions (for debugging)
     */
    static getAllSessions(): WalletSession[];
    /**
     * Refresh session expiry
     */
    static refreshSession(sessionToken: string, ttl?: number, persistent?: boolean): Promise<WalletSession | null>;
    /**
     * Clean up expired sessions
     */
    static cleanupExpiredSessions(): number;
    private static getSessionKey;
    private static saveSession;
    private static clearSessionsFromStorage;
    private static clearWalletSessionsFromStorage;
}
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