/**
 * File system operations for prompt cache (Browser version).
 *
 * This stub is used in browser builds via the package.json browser field.
 * File operations are not supported in browser environments.
 */
/**
 * Dump cache entries to a JSON file.
 * @throws Error - Always throws in browser environments.
 */
export declare function dumpCache(_filePath: string, _entries: Record<string, unknown>): void;
/**
 * Load cache entries from a JSON file.
 * @throws Error - Always throws in browser environments.
 */
export declare function loadCache(_filePath: string): Record<string, unknown> | null;