export interface UseLocalStorageOptions<T> {
    /**
     * Runtime shape check applied to every value decoded from storage — the
     * first read and each cross-tab update. Returning false discards the stored
     * value and falls back to `initialValue`.
     *
     * Without it the stored JSON is trusted to be a `T`, which only holds while
     * nothing else writes the key and the persisted shape never changes. Pass a
     * guard for anything whose shape has versions.
     *
     * Keep the identity stable (module scope or `useCallback`) — an inline
     * predicate re-subscribes the cross-tab listeners on every render.
     */
    validate?: (parsed: unknown) => parsed is T;
}
/**
 * Hook to use localStorage with state
 * @param key - localStorage key
 * @param initialValue - Initial value if key doesn't exist
 * @param options - Optional `validate` guard for the stored payload
 * @returns [storedValue, setValue] tuple
 */
export declare function useLocalStorage<T>(key: string, initialValue: T, options?: UseLocalStorageOptions<T>): [T, (value: T | ((val: T) => T)) => void];
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