/**
 * Custom hook to sync state with localStorage
 *
 * ## Business Perspective
 *
 * Enables widgets to remember user preferences and settings across browser
 * sessions, improving user experience by maintaining personalized configurations.
 * This is particularly valuable for security officers who configure specific
 * security levels and want their settings persisted. 💾
 *
 * ## Technical Perspective
 *
 * Provides a React state hook that automatically syncs with localStorage,
 * handling JSON serialization/deserialization and SSR compatibility. Uses
 * the same API as useState for familiarity.
 *
 * @template T - Type of the stored value
 * @param key - localStorage key to use for storage
 * @param initialValue - Initial value if key doesn't exist in localStorage
 * @returns Tuple of [storedValue, setValue] similar to useState
 *
 * @example
 * ```tsx
 * // Store user's preferred theme
 * const [theme, setTheme] = useLocalStorage('theme', 'light');
 *
 * return (
 *   <button onClick={() => setTheme(theme === 'light' ? 'dark' : 'light')}>
 *     Toggle Theme
 *   </button>
 * );
 * ```
 *
 * @example
 * ```tsx
 * // Store security level preferences
 * const [savedLevels, setSavedLevels] = useLocalStorage('securityLevels', {
 *   availability: 'Moderate',
 *   integrity: 'Moderate',
 *   confidentiality: 'Moderate'
 * });
 * ```
 *
 * @example
 * ```tsx
 * // Store widget visibility preferences
 * const [widgetPrefs, setWidgetPrefs] = useLocalStorage('widgetPreferences', {
 *   showDetails: true,
 *   expandedSections: ['overview', 'metrics']
 * });
 * ```
 */
export declare function useLocalStorage<T>(key: string, initialValue: T): [T, (value: T | ((prev: T) => T)) => void];
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