/**
 * Rate Limiter Storage - SMI-730, SMI-1189
 *
 * Storage implementations for rate limiting.
 */
import type { RateLimitStorage, TokenBucket } from './types.js';
/**
 * In-memory storage implementation
 */
export declare class InMemoryRateLimitStorage implements RateLimitStorage {
    private store;
    private cleanupInterval;
    constructor(cleanupIntervalMs?: number);
    get(key: string): Promise<TokenBucket | null>;
    set(key: string, value: TokenBucket, ttlMs: number): Promise<void>;
    delete(key: string): Promise<void>;
    clear(): Promise<void>;
    /**
     * Clean up expired entries
     */
    private cleanup;
    /**
     * Dispose of resources
     */
    dispose(): void;
    /**
     * Get storage stats (for testing/monitoring)
     */
    getStats(): {
        size: number;
        keys: string[];
    };
}
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