import { LocalStorageCache } from '../types/storage/LocalStorageCache';
/**
 * Creates a TTL-bounded localStorage cache for a single JSON-serializable value.
 *
 * Generalizes the per-widget option caches (e.g. the alerts channel-options
 * cache): entries older than `ttlMs` read as null, all access is guarded so it
 * never throws (storage disabled, quota, SSR), and malformed entries are
 * treated as a miss. The value is wrapped with a timestamp under `key`.
 * @template T The cached value type.
 * @param {string} key - The localStorage key.
 * @param {number} ttlMs - Time-to-live in milliseconds.
 * @returns {LocalStorageCache<T>} The cache handle (read/write/clear).
 */
export declare const createLocalStorageCache: <T>(key: string, ttlMs: number) => LocalStorageCache<T>;
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