import type { Redis } from "ioredis";
import type { Logger } from "pino";
import { ScheduleMap } from "..";
import { Closable } from "../Closable";
import type { Producer } from "../producer/producer";
import type { Acknowledger } from "./acknowledger";
export interface StaleCheckerConfig {
    interval?: number | "manual";
    staleAfter?: number;
}
export declare class StaleChecker<ScheduleType extends string> implements Closable {
    private readonly redis;
    private readonly acknowledger;
    private readonly producer;
    private readonly scheduleMap;
    private readonly logger?;
    private intervalId?;
    private readonly staleAfter;
    constructor(redis: Redis, acknowledger: Acknowledger<ScheduleType>, producer: Producer<ScheduleType>, scheduleMap: ScheduleMap<ScheduleType>, config?: StaleCheckerConfig, logger?: Logger | undefined);
    close(): void;
    private getMaxDate;
    private zremrangebyscoreandreturn;
    private parseJobDescriptor;
    check(): Promise<void>;
}
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