import type { RateLimiter } from '../RateLimiter';
export declare class NullRateLimiter<Req, Res> implements RateLimiter<Req, Res> {
    private readonly _callback;
    constructor(_callback: (req: Req) => Promise<Res>);
    request(req: Req): Promise<Res>;
    clear(): void;
    pause(): void;
    resume(): void;
}