import type { TimelineGroup } from "./types.js";
/** Every durable event sequence a group renders, nested work included. */
export declare function timelineGroupSequences(group: TimelineGroup): number[];
/**
 * The index of the group to land on for `sequence`: the group that holds it,
 * else the last group that starts before it. -1 when every loaded group is
 * later (the moment is in older history) or nothing is loaded.
 */
export declare function timelineGroupIndexAtSequence(groups: readonly TimelineGroup[], sequence: number): number;