import { EventEmitter } from 'node:events';
import type { Redis } from 'ioredis';
import type { WatcherEvent } from './consants';
import type { WatcherOptions } from './types';
export declare class Watcher extends EventEmitter {
    protected client: Redis;
    protected subscriberClient: Redis | undefined;
    protected subscribePatterns: string[];
    protected options: WatcherOptions;
    constructor(client: Redis, options?: WatcherOptions);
    on(event: `${WatcherEvent}`, listener: (key: string) => any): this;
    on(event: 'error', listener: (error: Error) => any): this;
    start(): Promise<void>;
    stop(): Promise<void>;
}