import http from 'http';
import { RateLimiterMemory } from 'rate-limiter-flexible';
export declare class RateLimiter {
    static readonly DEFAULT_IP_HEADER = "x-forwarded-for";
    static getIP(request: http.IncomingMessage): string;
    /**
     * Rate limit without risking leaking information on error
     */
    static rateLimitSafe(rateLimiter: RateLimiterMemory, key: string, pointsToConsume?: number): Promise<void>;
}