/**
 * Humanized time. Three questions, three functions: how long is this
 * duration (`span`, or `coarseSpan` for one unit only), how long ago was
 * this instant (`ago` — and its raw-duration twin `since`), how long
 * until this instant (`until`).
 *
 * `ago` degrades by distance instead of stacking units: fresh instants are
 * relative ("now", "3m ago", "2h 15m ago"), older ones snap to the clock the
 * reader would check — "10:30" earlier today, "yst 22:15" yesterday,
 * "Mon 09:00" within a week, "07/28" beyond. Relative wording past a few
 * hours ("19h ago") makes the reader do calendar math; a clock time doesn't.
 *
 * Accepts `Date | ISO string | epoch ms | null | undefined` and renders "—"
 * for null/undefined, same contract as ./format. Epoch numbers are
 * MILLISECONDS only — a seconds heuristic would silently misread dates near
 * the boundary, and a wrong timestamp should scream, not shift by 1000×.
 * Weekday/date fallbacks are en-pinned like every formatter here.
 */
export type Dateish = Date | string | number | null | undefined;
/** Duration in ms → "45s", "47m", "1h 40m", "2d 3h". Negative clamps to "0s". */
export declare function span(ms: number): string;
/**
 * Duration in ms → its coarsest single unit: "45s", "47min", "3h", "2d".
 * For a line that has room for one number and no column to align it in
 * (a notification, a list row); reach for `span` when the remainder
 * matters. Minutes are spelled in full here because the value stands
 * alone with no neighbouring unit to read "m" against.
 */
export declare function coarseSpan(ms: number): string;
/** Elapsed since an instant, as a bare duration: "47m", "1h 40m" (no "ago"). */
export declare function since(d: Dateish, now?: Dateish): string;
/**
 * Past instant, humanized: "now" (<1m), "3m ago", "2h 15m ago" (<6h), then
 * clock time — "10:30" today, "yst 22:15" yesterday, "Mon 09:00" within 7
 * days, "07/28" beyond. Future inputs render "now".
 */
export declare function ago(d: Dateish, now?: Dateish): string;
/** Future instant, humanized: "now", "in 40m", "in 5h 12m", "in 3d 13h". */
export declare function until(d: Dateish, now?: Dateish): string;
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