import type { MapScaleUnits } from './units';
/**
 * Picks the largest "nice" distance that still fits inside `maxWidthPx`.
 *
 * A bar labelled 1.37 km is useless for estimating anything; the whole point is
 * that the reader can halve it or triple it by eye.
 */
export declare function niceScaleDistance(metersPerPixel: number, maxWidthPx: number, units: MapScaleUnits): {
    distance: number;
    widthPx: number;
    label: string;
} | null;