import { QueueAdapter } from '../common/typing';
/**
 * Use sort set to keep queue in order and keep same value only insert once
 */
export declare class RedisQueueAdapter implements QueueAdapter {
    private readonly redis;
    private getQueueName;
    private getQueueScoreName;
    /**
     * If queue has the same item, return false
     * If queue not has the same item, return true
     */
    push<T>(key: string, item: T): Promise<boolean>;
    pop<T>(key: string): Promise<T | null>;
    length(key: string): Promise<number>;
}