/**
 * Set keys in the cache with a value.
 *
 * @param keys - An iterable of keys to set in the cache.
 * @param value - The value to set for the keys. If null, it indicates that
 *                the marker was not found at that location.
 */
export declare const setKeys: (keys: Iterable<string>, value: string | null) => void;
/**
 * Get a value from the cache by key.
 *
 * @param key - The key to look up in the cache.
 * @returns The cached value or undefined if not found.
 */
export declare const getKey: (key: string) => string | null | undefined;
/**
 * Clear the entire cache.
 *
 * This will remove all entries from the cache, forcing any new lookups
 * to fetch fresh data. Consider using the `force` option for `ancesdir` or
 * `closesdir` to force fresh lookups on a case-by-case basis if you want
 * to avoid invalidating the entire cache.
 */
export declare const clearCache: () => void;