import type { CachedOutput, EvaluationCache } from './cache.js';
/**
 * Target outputs as JSON files in a directory, one per key, so a CI job keeps them between runs by
 * caching the directory. Writes go through a temporary file and a rename, so a reader never sees half
 * an entry. Outputs must survive `JSON.stringify()`.
 */
export declare class FileEvaluationCache implements EvaluationCache {
    private readonly directory;
    constructor(directory: string);
    /** The output under a key, or `undefined` when there is none or its file cannot be read. */
    get(key: string): Promise<CachedOutput | undefined>;
    /** Writes an output under a key. */
    set(key: string, value: CachedOutput): Promise<void>;
    private fileOf;
}