import type { DispatchTask } from "../types.ts";
/**
 * Format the elapsed time of a task from startedAt to completedAt (or now).
 *
 * `formatDuration(…, "clock")`: `Xs` under a minute, `Xm Ys` under an hour,
 * `Xh Ym` above (the old ladder pinned everything to minutes).
 */
export declare function formatDuration(task: DispatchTask): string;
/**
 * Format a millisecond duration as a human-readable age string.
 *
 * `formatDuration(…, "monitor")` after clamping negatives to zero: `0ms` for
 * negatives (unchanged) and the `?` sentinel — never `NaNm NaNs` — for
 * non-finite input. Exact-minute ages lose the trailing zero seconds
 * (`1m 0s` → `1m`), the monitor style's documented shape.
 */
export declare function formatAge(ms: number): string;
/**
 * Format the duration between two explicit Date values.
 * Used by task-export where both start and end are known.
 *
 * Same `"clock"` ladder as {@link formatDuration}: `Xm Ys` rolls up to
 * `Xh Ym` past the hour instead of staying pinned to minutes.
 */
export declare function formatDurationBetween(start: Date, end: Date): string;
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