export interface RateLimiterOptions {
    limit: number;
    intervalMs: number;
}
export interface RateLimiterResult {
    allowed: boolean;
    retryAfterMs?: number;
}
export declare class SlidingWindowRateLimiter {
    private readonly timestamps;
    readonly limit: number;
    readonly intervalMs: number;
    constructor(options: RateLimiterOptions);
    tryAcquire(now?: number): RateLimiterResult;
}