import type { TimelineGroup } from "../timeline/types.js";
export type TimelineSettlement = {
    element: HTMLElement;
    top: number;
};
/** Capture only a retained answer at a real live→settled boundary, never history load. */
export declare function captureTimelineSettlement(scroller: HTMLElement, groups: readonly {
    key: string;
    group: TimelineGroup;
}[]): TimelineSettlement | null;
/**
 * Folding earlier prose can clamp scrollTop before paint. Keep the retained
 * answer visually continuous after the normal scroll authority has run. This
 * is one local position transition, not a new scroll writer or a presence tree.
 */
export declare function animateTimelineSettlement(snapshot: TimelineSettlement): Animation | null;