/**
 * Human-readable elapsed times.
 *
 * The CLI reports durations in three unrelated places — cache age, trace timings, and
 * runstate phase spans — and each grew its own formatter. These are the shared ones.
 */
export declare const SECONDS_PER_MINUTE = 60;
export declare const SECONDS_PER_HOUR = 3600;
export declare const SECONDS_PER_DAY = 86400;
export declare const MILLIS_PER_SECOND = 1000;
/**
 * Seconds as the largest two units that carry information: `45s`, `5m 3s`, `2h 14m`,
 * `1d 3h`.
 *
 * Two units because one is too coarse to compare runs (`2h` hides 59 minutes) and three is
 * noise at these magnitudes. Negative input keeps its sign rather than being clamped —
 * a backwards span is a real signal (see `runstate-stats`), not a rendering accident.
 */
export declare function formatDuration(seconds: number): string;
/** A duration for a table cell: human form plus the raw seconds it was derived from. */
export declare function formatDurationCell(seconds: number | null): string;
/**
 * An age as a single rounded unit: `45s`, `3m`, `2h`, `9d`.
 *
 * Coarser than {@link formatDuration} on purpose — "how stale is this cache entry" needs
 * one glanceable unit, not a precise span. `suffix` appends e.g. `' ago'`.
 */
export declare function formatAge(ageMs: number, suffix?: string): string;
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