/**
 * The keyed `$state` store — ONE implementation, two venues.
 *
 * `$state` is a tree binding (`core/genui/tree-node.ts`), and the renderer
 * resolves it against a keyed `Record<string, Json>` owned by
 * `StatefulTreeView`. A code-land app needs the same store with the same
 * semantics, so it lives HERE — in the bundle both venues already share, the
 * way `reshape` does — instead of being written twice.
 *
 * Semantics (the renderer's, unchanged): one namespace per instance, `Json`
 * values, last write wins per key, and other keys stand.
 */
import type { Json } from "../../core/index.js";
/** A `$state` namespace: keys the tree (or the app's code) binds to. */
export type KeyedState = Record<string, Json>;
/** The store, as a hook: `[state, setKey]`. */
export declare function useKeyedState(): [KeyedState, (key: string, value: Json) => void];