import { TransformFunction } from 'ol/proj';
/**
 * whether two coordinates are equivalent
 * @param c1 {number[]} coordinate 1
 * @param c2 {number[]} coordinate 2
 * @return {boolean} equals or not
 * */
export declare const coordsEquals: (c1: number[], c2: number[]) => boolean;
/**
 * transform a coordinate between more than two projection
 * projection1 -(f1)-> projection2 -(f2)-> projection3
 *
 * @param f1 {TransformFunction} the first transform
 * @param f2 {TransformFunction} the sconed transform
 * @return {TransformFunction} a new transformation func which can transform a coordinate from projection a to projection b and then projection c
 * */
export declare const transformChain: (f1: TransformFunction, f2: TransformFunction) => (p0: number[], p1?: number[], p2?: number) => number[];