import { QueryProfiler, QuerySpan } from "./storage.mjs";
/**
 * Build a {@link QueryProfiler} that records each closed span to `sink`.
 *
 * `start(name, meta)` stamps the open time and returns an `end` thunk; calling
 * `end(extra)` records `{ name, ms, meta }` with `extra` merged over the
 * open-time `meta` (so completion-only facts — row counts, buffered-file
 * counts — land on the same span). `now` is injectable for deterministic
 * tests; it defaults to `Date.now`.
 */
declare function createQueryProfiler(sink: (span: QuerySpan) => void, now?: () => number): QueryProfiler;
/**
 * A profiler that accumulates closed spans into an array — for tests, the CLI
 * `query` command, or any ad-hoc "where did the time go" probe. The returned
 * `spans` array is filled as spans close, in completion order.
 */
declare function collectSpans(now?: () => number): {
  profiler: QueryProfiler;
  spans: QuerySpan[];
};
export { collectSpans, createQueryProfiler };