/** Minimal interface for a Redis client that supports eval */
export interface RedisLike {
    eval(script: string, numkeys: number, ...args: (string | number)[]): Promise<unknown>;
}
export interface SlidingWindowOptions {
    redis: RedisLike;
    limit: number;
    /** Window duration in milliseconds */
    windowMs: number;
    prefix: string;
    timeout?: number;
}
export interface LimitResult {
    success: boolean;
    limit: number;
    remaining: number;
    /** Unix timestamp in milliseconds when the window resets */
    reset: number;
}
export declare class SlidingWindowLimiter {
    private redis;
    private maxRequests;
    private windowMs;
    private prefix;
    private timeout;
    constructor(options: SlidingWindowOptions);
    limit(identifier: string): Promise<LimitResult>;
}
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