import { LangChainBaseMessage } from "./types.js";
import { ForkCheckpointClient } from "./findForkCheckpointInHistory.js";
//#region src/resolveForkCheckpoint.d.ts
type MessageMetadataSnapshot = ReadonlyMap<string, {
  readonly parentCheckpointId: string | undefined;
}> | undefined;
/**
 * Hydration seeds every message with the head's parent checkpoint, so only the
 * head's recorded fork checkpoint is reliable; older turns are matched against
 * server history by message id. A `null` `parentId` edits the first human
 * message and forks from the thread's initial (empty-message) checkpoint.
 */
declare const resolveForkCheckpoint: (client: ForkCheckpointClient, threadId: string, messages: readonly LangChainBaseMessage[], parentId: string | null, sourceId: string | null | undefined, metadata: MessageMetadataSnapshot, messagesKey: string) => Promise<string | null>;
//#endregion
export { resolveForkCheckpoint };
//# sourceMappingURL=resolveForkCheckpoint.d.ts.map