/**
 * CesiumPlus cache module
 * In-memory cache with optional TTL support
 */
/**
 * Generic cache class with TTL support
 */
export declare class Cache<T> {
    private cache;
    private ttl;
    /**
     * Create a new cache
     * @param ttl - Time to live in milliseconds (0 = no expiration)
     */
    constructor(ttl?: number);
    /**
     * Check if a key exists and is not expired
     */
    has(key: string): boolean;
    /**
     * Get a value from cache
     * Returns undefined if not found or expired
     */
    get(key: string): T | undefined;
    /**
     * Set a value in cache
     */
    set(key: string, value: T): void;
    /**
     * Delete a key from cache
     */
    delete(key: string): boolean;
    /**
     * Clear all cached entries
     */
    clear(): void;
    /**
     * Get cache size
     */
    get size(): number;
    /**
     * Check if an entry is expired
     */
    private isExpired;
    /**
     * Clean up expired entries
     */
    cleanup(): void;
}
/**
 * Profile cache manager
 * Manages separate caches for profiles and avatars
 */
export declare class ProfileCacheManager {
    private profileCache;
    private avatarCache;
    constructor(ttl?: number);
    /**
     * Get profile cache
     */
    get profiles(): Cache<unknown>;
    /**
     * Get avatar cache
     */
    get avatars(): Cache<string | null>;
    /**
     * Clear all caches
     */
    clearAll(): void;
    /**
     * Clear cache for a specific pubkey/address
     */
    clearFor(pubkey: string, address?: string): void;
    /**
     * Clean up expired entries in all caches
     */
    cleanup(): void;
}