export declare class DataStore {
    private client;
    private prefix;
    constructor(namespace?: string);
    start(): Promise<void>;
    stop(): Promise<void>;
    get(key: string): Promise<string | null>;
    set(key: string, value: string): Promise<string | null>;
    del(key: string): Promise<boolean>;
    expire(key: string, seconds: number): Promise<boolean>;
    ttl(key: string): Promise<number>;
    incr(key: string): Promise<number>;
    decr(key: string): Promise<number>;
    slice(list: string, start?: number, end?: number): Promise<string[]>;
    push(list: string, value: string): Promise<number>;
    unshift(list: string, value: string): Promise<number>;
    pop(list: string): Promise<string | null>;
    shift(list: string): Promise<string | null>;
}