import { LatLong } from './latLong';
/**
 * Calculate the distance between two lat long points
 * @param lat1
 * @param lon1
 * @param lat2
 * @param lon2
 *
 * @signature
 *    U.distance(lat1, long1, lat2, long2)
 *
 * @example
 *    distance(1, 1, 2, 2) // => 157.22543203805722;
 */
export declare function distance(lat1: number, lon1: number, lat2: number, lon2: number): number;
/**
 * Calculate the distance between two lat long points
 * @param latLong1
 * @param latLong2
 *
 * @signature
 *    U.distance(latLong1, latLong2)
 *
 * @example
 *
 *    const a: U.LatLong = new LatLong(1, 1);
 *    const b: U.LatLong = new LatLong(2, 2);
 *    U.distance(a, b) // => 157.22543203805722
 *
 */
export declare function distance(latLong1: LatLong, latLong2: LatLong): number;
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