/**
 * @typedef {object} RedisStoreOptions
 * @property {string} [keyPrefix='chall:']   Prepended to every key.
 */
/**
 * @param {any} client
 * @param {RedisStoreOptions} [options]
 * @returns {import('./index.js').IncrStore}
 */
export function redisStore(client: any, options?: RedisStoreOptions): import("./index.js").IncrStore;
export type RedisStoreOptions = {
    /**
     * Prepended to every key.
     */
    keyPrefix?: string | undefined;
};