/**
 * Set Operations Implementation
 * Provides Redis-compatible set operations (SADD, SREM, SMEMBERS, SISMEMBER)
 * Requirements: 1.12
 */
import { CacheEngine } from './CacheEngine.js';
/**
 * SetOperations provides Redis-compatible set operations.
 * Sets are stored as JSON-serialized arrays of base64-encoded strings.
 * Uses a Set internally for O(1) membership checks.
 *
 * Requirements:
 * - 1.12: Support SADD, SREM, SMEMBERS, and SISMEMBER commands for set operations
 */
export declare class SetOperations {
    private readonly cacheEngine;
    constructor(cacheEngine: CacheEngine);
    /**
     * Serialize a Set of Buffer values to a JSON string for storage.
     * Each Buffer is encoded as base64.
     */
    private serializeSet;
    /**
     * Deserialize a stored JSON string back to a Set of base64-encoded strings.
     */
    private deserializeSet;
    /**
     * Get the current set stored at key, or an empty Set if not exists.
     */
    private getSet;
    /**
     * Save a set to the cache.
     */
    private saveSet;
    /**
     * Add one or more members to a set stored at key.
     * If the key doesn't exist, a new set is created.
     *
     * @param key - The cache key
     * @param members - Members to add to the set
     * @returns The number of members that were added (not already present)
     */
    sadd(key: string, ...members: Buffer[]): Promise<number>;
    /**
     * Remove one or more members from a set stored at key.
     *
     * @param key - The cache key
     * @param members - Members to remove from the set
     * @returns The number of members that were removed
     */
    srem(key: string, ...members: Buffer[]): Promise<number>;
    /**
     * Get all members of the set stored at key.
     *
     * @param key - The cache key
     * @returns Array of all members in the set
     */
    smembers(key: string): Promise<Buffer[]>;
    /**
     * Check if a member exists in the set stored at key.
     *
     * @param key - The cache key
     * @param member - The member to check for
     * @returns true if the member exists in the set
     */
    sismember(key: string, member: Buffer): Promise<boolean>;
}
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