/**
 * Sliding-window rate limiter using fixed-window approximation.
 * No external dependencies.
 */
export declare class SlidingWindowLimiter {
    private readonly maxRequests;
    private readonly windowMs;
    private readonly windows;
    constructor(maxRequests: number, windowMs: number);
    check(key: string): {
        allowed: true;
    } | {
        allowed: false;
        retryAfterMs: number;
    };
    cleanup(): void;
}
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