import { BaseCache } from "@langchain/core/caches";
import { Generation } from "@langchain/core/outputs";
/**
 * A cache that uses the local filesystem as the backing store.
 * This is useful for local development and testing. But it is not recommended for production use.
 */
export declare class LocalFileCache extends BaseCache {
    private cacheDir;
    private constructor();
    /**
     * Create a new cache backed by the local filesystem.
     * It ensures that the cache directory exists before returning.
     * @param cacheDir
     */
    static create(cacheDir?: string): Promise<LocalFileCache>;
    /**
     * Retrieves data from the cache. It constructs a cache key from the given
     * `prompt` and `llmKey`, and retrieves the corresponding value from the
     * cache files.
     * @param prompt The prompt used to construct the cache key.
     * @param llmKey The LLM key used to construct the cache key.
     * @returns An array of Generations if found, null otherwise.
     */
    lookup(prompt: string, llmKey: string): Promise<any>;
    /**
     * Updates the cache with new data. It constructs a cache key from the
     * given `prompt` and `llmKey`, and stores the `value` in a specific
     * file in the cache directory.
     * @param prompt The prompt used to construct the cache key.
     * @param llmKey The LLM key used to construct the cache key.
     * @param generations The value to be stored in the cache.
     */
    update(prompt: string, llmKey: string, generations: Generation[]): Promise<void>;
}