/**
 * Reads a cached value from IndexedDB by key.
 *
 * @param key - Unique cache key
 * @returns The cached value, or `undefined` if not found
 */
export declare const readFromCache: <T>(key: string) => Promise<T | undefined>;
/**
 * Writes a value to IndexedDB under the given cache key.
 *
 * @param value - Object to store; must include `id` and `namespace`
 */
export declare const writeToCache: <T extends {
    namespace: string;
    id: string;
}>(value: T) => Promise<void>;
/**
 * Serializes a value into a stable string for cache key generation.
 *
 * - Recursively handles arrays and objects
 * - Skips functions, promises and undefined values
 * - Omits keys listed in `ignoreKeys` (only for objects)
 * - Ensures consistent key ordering for objects
 *
 * @param obj - The input to serialize (can be primitive, array, or object)
 * @param ignoreKeys - Keys to exclude from object serialization
 * @returns A stable, stringified representation
 */
export declare const stableSerialize: (obj: unknown, ignoreKeys: string[]) => string;
/**
 * Generates a consistent 64-bit hash key for caching based on input arguments.
 *
 * - Serializes objects using `stableSerialize`
 * - Combines all arguments into a single stable string
 *
 * @param ignoreKeys - Keys to exclude from object serialization
 * @param args - Values to base the cache key on (objects, arrays, or primitives)
 * @returns A stable 64-bit hash string
 */
export declare const generateCacheKey: (ignoreKeys: string[], ...args: unknown[]) => Promise<string>;
/**
 * Configuration options for the persistent caching utility.
 *
 * @template TResult - Result type returned by the generator function.
 */
interface BaseCacheConfig<TResult> {
    /**
     * Keys to exclude when generating a stable cache key from input arguments.
     */
    ignoreKeys?: string[];
    /**
     * In-memory cache object, useful for cache sharing across plugins/tabs.
     */
    cache?: Record<string, Promise<TResult>>;
}
interface MemoryOnlyCacheConfig<TResult> extends BaseCacheConfig<TResult> {
    /**
     * Store only in RAM (fast, temporary). No IndexedDB fallback.
     */
    cacheMode: "memory";
    /**
     * No parallel computation needed since memory cache is synchronous.
     */
    parallel?: never;
}
interface IdbOrBothCacheConfig<TResult> extends BaseCacheConfig<TResult> {
    /**
     * Store in IndexedDB, or both memory and IndexedDB.
     */
    cacheMode: "idb" | "both";
    /**
     * If true, read from cache and compute in parallel.
     * Defaults to true.
     */
    parallel?: boolean;
}
/**
 * Type-safe configuration for createPersistentCache utility.
 */
export type CacheConfigType<TResult> = MemoryOnlyCacheConfig<TResult> | IdbOrBothCacheConfig<TResult>;
/**
 * Creates a cached version of an async function with memory and/or persistent caching capabilities.
 *
 * ## Features:
 * - Prevents redundant computations across sessions or concurrent calls
 * - Shares results between tabs or plugins (Pass external cache object to share in-memory cache across plugins)
 * - Supports in-memory, IndexedDB, or both as cache targets
 * - Optional parallel execution of cache read and function compute
 * - Useful for data generation, API fetches, or any expensive computation
 * *
 * ## Parameters
 * @template Args - Argument types of the generator function
 * @template Result - Return type of the generator function
 *
 * @param generator - The async function to cache (e.g., a fetcher or processor)
 * @param namespace - A tag used to group related cached entries for cleanup or metrics
 * @param config - Optional configuration:
 *   - `ignoreKeys` _(string[])_ — Keys to exclude from cache key generation (default: `[]`)
 *   - `cache` _(Record<string, Promise<Result>>)_ — External in-memory cache object to sync across plugins/tabs (default: internal default cache)
 *   - `cacheTarget` _(`"memory"` | `"idb"` | `"both"`)_ — Where to store the result:
 *       - `"memory"`: RAM-only; fast but temporary
 *       - `"idb"`: stores in IndexedDB only; avoids memory usage; Useful for processing large data
 *       - `"both"` (default): caches in both RAM and IndexedDB
 *   - `parallel` _(boolean)_ — If true, reads from cache and computes in parallel (default: `true`);
 *       ignored when `cacheTarget` is `"memory"`
 *
 * @returns A memoized async function that handles caching automatically.
 *
 * @example
 * const fetchWithCache = createPersistentCache(fetchJson, "remote-data");
 * await fetchWithCache("https://example.com/api/data");
 */
export declare const createPersistentCache: <TArgs extends unknown[], TResult>(generator: (...args: TArgs) => Promise<TResult>, namespace: string, config?: CacheConfigType<TResult>) => ((...args: TArgs) => Promise<TResult>);
/**
 * Deletes stale cache entries from IndexedDB based on age and namespace.
 *
 * - Only entries with matching `namespace` are considered
 * - Entries older than `maxAgeMinutes` (based on `last-accessed` field) are deleted
 *
 * Requirements for each entry:
 * - `namespace: string` set in `createPersistentCache`
 * - `last-accessed: number` is automatically set by `writeToCache`
 *
 * @param maxAgeMinutes - Age threshold in minutes; entries older than this will be removed
 * @param namespace - Namespace tag to limit cleanup scope
 */
export declare const simpleCleanup: (maxAgeMinutes: number, namespace: string) => Promise<void>;
export {};