import type { DelegatedActivity, Session } from "../shared/types.js";
/**
 * Build the derived "work still happening below me" summary for every parent.
 * Active sessions propagate through the entire ancestor chain; graph cycles are
 * contained and an active session is never counted as its own descendant.
 */
export declare function buildDelegatedActivityIndex(sessions: readonly Session[], activeSessionIds: ReadonlySet<string>): Map<string, DelegatedActivity>;
//# sourceMappingURL=delegated-activity.d.ts.map