import type { MapScale } from './map.types';
/**
 * Maps a data value to a pixel size for proportional symbology.
 *
 * @description
 * Nine of the sixteen surveyed applications hand-rolled this same calculation
 * before plotting circles. It lives here so that a marker's radius and the size
 * key in `MapLegend` are guaranteed to come from identical math — a legend that
 * disagrees with the symbols it describes is worse than no legend.
 *
 * `'sqrt'` is the default because it makes the rendered *area* proportional to
 * the value. `'linear'` scales the radius directly and therefore exaggerates
 * large values; use it only when the mark is a bar or a line, not a disc.
 *
 * Degenerate inputs collapse to `range[0]` rather than producing `NaN`:
 * a zero-width domain, a non-finite value, and (for `'log'`) any non-positive
 * bound or value.
 */
export declare function resolveScale(scale: MapScale): number;
/**
 * Default marker radius, in pixels, when `shape: 'circle'` is used with neither
 * `radiusPx` nor `scale`. Sized to read as a deliberate dot next to the 32px
 * pin without competing with it.
 */
export declare const DEFAULT_MARKER_RADIUS_PX = 8;