import { ChannelRegistry, ProjectionSpec } from "@langchain/langgraph-sdk/stream";

//#region src/use-projection.d.ts
/**
 * React-side primitive that composes {@link ChannelRegistry.acquire}
 * with {@link useSyncExternalStore}.
 *
 * Contract:
 *  - On mount (or when `key` changes) this hook acquires a
 *    ref-counted projection from the registry and subscribes to its
 *    store. React re-renders automatically whenever the store's
 *    snapshot changes.
 *  - On unmount (or when `key` changes) the previous acquisition is
 *    released. If this was the last consumer of that spec, the
 *    registry closes the underlying server subscription.
 *
 * The first render (before `useEffect` runs) returns `initialValue`.
 * Subsequent renders read from the acquired store.
 *
 * Framework bindings for Vue/Svelte/Angular follow the same shape —
 * acquire on setup/mount, release on scope-dispose/unmount — but use
 * their own reactivity primitive instead of `useSyncExternalStore`.
 */
declare function useProjection<T>(registry: ChannelRegistry | null | undefined, specFactory: () => ProjectionSpec<T>, key: string, initialValue: T): T;
//#endregion
export { useProjection };
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