/**
 * The run-event fold: turn a persisted run log into a `RunProjection`.
 *
 * @module @nhtio/adk/batteries/orchestration/runs
 */
import type { RunEvent, RunProjection } from "./types";
/**
 * Fold a sequence of run events into a single {@link RunProjection}.
 *
 * The projection is derived entirely from the events themselves — no graph, no store, and no
 * side channel. It is deterministic and total: the same event list always folds to the same
 * projection.
 *
 * @param events - The ordered run events to fold.
 * @returns The projected state of the run.
 * @throws If the first event is not `run_started` (a malformed event list).
 */
export declare function foldRun(events: RunEvent[]): RunProjection;