import { EventEnvelope, TreeNode } from "./types.js";
/** Pair promptStart events with their terminators — a promptCompletion,
 *  an error event with errorType "llmError", or a promptCancelled — by
 *  span and order: the nth start in a span pairs with the nth
 *  terminator. Returns the set of PAIRED starts; anything not in the
 *  set never completed (a hung, killed, or in-flight call — in follow
 *  mode this is the live in-flight indicator). Paired starts are hidden
 *  from the tree: the terminator row already carries the interesting
 *  data, and doubling every call's rows would make the common case
 *  worse to read. */
export declare function pairedPromptStarts(events: EventEnvelope[]): Set<EventEnvelope>;
export declare function buildForest(events: EventEnvelope[]): TreeNode[];