/**
 * The clock's little formatters, shared by the terminal and the markdown
 * renderings so the two cannot drift — the same reason `formatUsd` lives once.
 */
/** A gap, in the coarsest unit that keeps one significant figure honest. */
export declare function formatGap(ms: number): string;
/** `YYYY-MM-DD`, UTC — the same bucketing the core's spendByDay uses. */
export declare const dayOf: (ms: number) => string;
/** The span's length in days, one decimal. */
export declare const spanDays: (fromMs: number, toMs: number) => string;
/**
 * The median of a list, the yardstick a spike cannot inflate.
 *
 * A mean would let the most expensive day raise the bar it is measured
 * against; the median holds still. Returns 0 for an empty list.
 */
export declare function median(values: readonly number[]): number;
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