import Client from 'ioredis';
export type CachedResult = {
    type: 'error';
    error: string;
} | {
    type: 'value';
    value?: string;
};
export declare class RedisCache {
    private readonly redis;
    /**
     * Constructs an instance of RedisCache.
     * @param redis A RedisClientType instance for Redis operations.
     */
    constructor(redis: Client);
    /**
     * Retrieves a cached result by key.
     * @param key The cache key to retrieve the value for.
     * @returns A promise that resolves to a CachedResult or null if the key is not found.
     */
    get(key: string): Promise<CachedResult | null>;
    /**
     * Sets a value in the cache.
     * @param key The cache key to set the value for.
     * @param value The CachedResult to store.
     * @returns A promise that resolves when the operation is complete.
     */
    set(key: string, value: CachedResult): Promise<void>;
}