/**
 * `useVendoState` — the `$state` binding, in code-land (blueprint §5.4).
 *
 * The same keyed store the renderer resolves `{ $state: "tab" }` against
 * (`@vendoai/vendo/ui/kit`'s `useKeyedState`, owned by the provider): one namespace
 * per app instance, `Json` values, `[value, setValue]`. An unwritten key reads
 * as its `initial` — the fallback is a READ, never a write, so mounting a
 * component can never mutate the app's state.
 */
import type { Json } from "../../core/index.js";
export declare function useVendoState<T extends Json = Json>(key: string, initial?: T): [T | undefined, (value: T) => void];