export declare type RedisCallback<T> = (error: Error | null, result: T) => void;
/**
 * A minimal subset of the callback interface that is implemented by several Redis
 * clients.
 */
export interface CompatibleCallbackRedisClient {
    get(key: string, callback?: RedisCallback<string | null>): unknown;
    set(key: string, value: string, callback?: RedisCallback<unknown>): unknown;
    set(key: string, value: string, expiryMode: 'PX', time: number, callback?: RedisCallback<unknown>): unknown;
    del(key: string, callback?: RedisCallback<number>): unknown;
    on?(event: 'error', callback?: (error: Error) => unknown): unknown;
    sadd(key: string, member: string, callback?: RedisCallback<unknown>): unknown;
    srem(key: string, member: string, callback?: RedisCallback<unknown>): unknown;
    smembers(key: string, callback?: RedisCallback<string[]>): unknown;
    sismember(key: string, member: string, callback?: RedisCallback<number>): unknown;
}
/**
 * A minimal subset of the Promise interface that is implemented by several Redis clients.
 */
export interface CompatiblePromiseRedisClient {
    get(key: string): PromiseLike<string | null>;
    set(key: string, value: string): PromiseLike<unknown>;
    set(key: string, value: string, expiryMode: 'PX', time: number): PromiseLike<unknown>;
    del(key: string): PromiseLike<number>;
    on?(event: 'error', callback: (error: Error) => unknown): unknown;
    sadd(key: string, member: string): PromiseLike<unknown>;
    srem(key: string, member: string): PromiseLike<unknown>;
    smembers(key: string): PromiseLike<string[]>;
    sismember(key: string, member: string): PromiseLike<number | boolean>;
}
/**
 * A minimal subset of the Promise interface that is implemented by the “modern”
 * node-redis version 4.
 */
export interface CompatibleNodeRedisV4Client {
    get(key: string): Promise<string | null>;
    GET(key: string): Promise<string | null>;
    set(key: string, value: string, options?: {
        PX: number;
    }): Promise<unknown>;
    SET(key: string, value: string, options?: {
        PX: number;
    }): Promise<unknown>;
    del(key: string): Promise<number>;
    DEL(key: string): Promise<number>;
    on?(event: 'error', callback: (error: Error) => unknown): unknown;
    SADD(key: string, member: string): Promise<unknown>;
    SREM(key: string, member: string): Promise<unknown>;
    SMEMBERS(key: string): Promise<string[]>;
    SISMEMBER(key: string, member: string): Promise<number | boolean>;
}
export declare type CompatibleRedisClient = CompatibleCallbackRedisClient | CompatiblePromiseRedisClient | CompatibleNodeRedisV4Client;
export declare function isCompatiblePromiseRedisClient(client: CompatibleRedisClient): client is CompatiblePromiseRedisClient;
export declare function isCompatibleNodeRedisV4Client(client: CompatibleRedisClient): client is CompatibleNodeRedisV4Client;