/**
 * Sliding Window Rate Limiter
 *
 * Implements the sliding window counter algorithm for rate limiting.
 * Uses two adjacent fixed-window counters with weighted interpolation
 * to approximate a true sliding window with O(1) storage per check.
 *
 * Built entirely on StorageAdapter interface (incr, mget, expire) —
 * works with Memory, Redis, Vercel KV, Upstash backends.
 */
import type { StorageAdapter } from '@frontmcp/utils';
import type { RateLimitResult } from './types';
export declare class SlidingWindowRateLimiter {
    private readonly storage;
    constructor(storage: StorageAdapter);
    /**
     * Check whether a request is allowed under the rate limit.
     * If allowed, the counter is atomically incremented.
     */
    check(key: string, maxRequests: number, windowMs: number): Promise<RateLimitResult>;
    /**
     * Reset the rate limit counters for a key.
     */
    reset(key: string, windowMs: number): Promise<void>;
}