/**
 * Filesystem-based Response Cache for CLI
 *
 * Stores cached API responses as JSON files organized by hash prefix.
 * Cache entries never expire - they're kept forever.
 */
import type { CachedResponse, ResponseCache } from './types';
/**
 * Filesystem-based cache implementation for CLI usage.
 *
 * Directory structure:
 * ```
 * ./chat-to-map/cache/requests/
 * ├── ab/
 * │   └── abcd1234...json
 * ├── cd/
 * │   └── cdef5678...json
 * ```
 *
 * Uses first 2 chars of hash as subdirectory to avoid too many files in one dir.
 */
export declare class FilesystemCache implements ResponseCache {
    private readonly cacheDir;
    constructor(cacheDir: string);
    get<T = unknown>(hash: string): Promise<CachedResponse<T> | null>;
    set<T = unknown>(hash: string, response: CachedResponse<T>): Promise<void>;
    setPrompt(hash: string, prompt: string): Promise<void>;
    /**
     * Get the file path for a cache entry.
     * If key contains '/', use as subdirectory. Otherwise use first 2 chars as prefix.
     */
    private getCachePath;
    /**
     * Clear all cached entries (for testing or manual cleanup)
     */
    clear(): Promise<void>;
}
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