/**
 * For every workflow a NEWER event on the same Todo has already started, the id
 * of that event.
 *
 * Supersession picks the newest qualifying event, and the pending list answers
 * that for siblings still waiting their turn. It cannot answer it for one that
 * has already run: a settled event is no longer pending, and past the page's own
 * limit an unsettled one is not there either. So an event that re-enters the
 * drain later — a deferral released when its label finally landed — would see an
 * empty gate and start a second run on a lane a newer event has already taken.
 *
 * "Newer" is strict, and by the same `created_at, rowid` key the pending list
 * orders on, so every event named here is truthfully newer than the one asking.
 */
export declare function startedAfterEvent(eventId: string): Map<string, string>;
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