import { Position } from "geojson";
/**
 * Creates a function for fast geodesic distance approximation using local scaling constants
 * based on a reference latitude. Useful for city-scale distances.
 *
 * @param {number} lat - Reference latitude in degrees
 * @returns {(a: Position, b: Position) => number} - Function that computes distance between two points
 *
 * @example
 * const distance = createCheapRuler(50.5);
 * const d = distance([30.5, 50.5], [30.51, 50.49]);
 *
 */
export declare function createCheapRuler(lat: number): (a: Position, b: Position) => number;