import type { AtUriString } from '@atproto/lex-schema';
import { app } from '../../../../lexicons/index.js';
type ActivityItem = app.bsky.unspecced.getAtmosphereTimeline.ActivityItem;
type ActivityGroup = app.bsky.unspecced.getAtmosphereTimeline.ActivityGroup;
export type TimelineActivity = {
    item: ActivityItem;
    sortedAt: number;
    target?: AtUriString;
    groupable: boolean;
};
/** Select the timeline gap and grouping window using the newer activity's age. */
export declare function atmosphereWindow(ageMs: number): number;
/** Attach article reactions, then group remaining activities at their newest position. */
export declare function groupAtmosphereActivities(activities: TimelineActivity[], now: number): (ActivityItem | ActivityGroup)[];
export {};
//# sourceMappingURL=atmosphere-grouping.d.ts.map