import { Logger } from 'egg-logger';
export declare class Limiter {
    private readonly logger;
    private readonly threshold;
    private readonly logPrefix;
    private lastTime;
    private discarded;
    constructor(logger: Logger, logPrefix: string, threshold: number);
    runSync(fn: () => void): void;
    run(fn: () => Promise<void>): Promise<void>;
    private shouldRun;
}