@langchain/langgraph-sdk/dist/stream/store.d.ts

Client library for interacting with the LangGraph API

//#region src/stream/store.d.ts
/**
 * Minimal observable store backing every framework binding.
 *
 * The shape is intentionally tiny:
 *
 *  - `subscribe(listener) → unsubscribe` lines up with React's
 *    `useSyncExternalStore`.
 *  - `getSnapshot()` returns a referentially-stable value for
 *    unchanged state so React can bail out of renders.
 *  - Vue/Svelte/Angular bindings wrap `subscribe` + `getSnapshot` in
 *    their own reactivity primitive (`shallowRef` / `writable` /
 *    `signal`) in ~10 lines.
 *
 * Snapshot identity matters: a listener is only useful if
 * `getSnapshot()` returns a *different* reference when state changes.
 * Callers MUST pass a freshly-constructed value to {@link setState};
 * mutating the previous snapshot in place will break React's bail-out
 * and cause infinite re-renders.
 */
type StoreListener = () => void;
declare class StreamStore<T> {
  #private;
  constructor(initial: T);
  subscribe: (listener: StoreListener) => () => void;
  getSnapshot: () => T;
  /** Replace the snapshot and notify every listener. */
  setValue: (next: T) => void;
  /**
   * Functional update. The `updater` receives the current snapshot and
   * MUST return a new object. Returning the same reference is a no-op.
   */
  setState: (updater: (previous: T) => T) => void;
}
//#endregion
export { StoreListener, StreamStore };
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