/** Returns the cached value (which may itself be null), or undefined on miss/expiry. */
export declare function readCache<T>(name: string, ttlMs: number): T | undefined;
export declare function writeCache(name: string, value: unknown): void;
/** Sanitize an arbitrary string into a filename-safe cache key part. */
export declare function safeKey(s: string): string;
/** Short stable hash for keys that may be long or contain path separators. */
export declare function hashKey(s: string): string;