import type { ArrayVector2D } from "./types.js";
/**
 * Adds one 2D vectors.
 * @param {ArrayVector2D} xy1 - First vector as `[x, y]`
 * @param {ArrayVector2D} xy2 - Second vector as `[x, y]`
 * @returns {ArrayVector2D} The sum of the vectors
 */
export declare const add2D: (xy1: ArrayVector2D, xy2: ArrayVector2D) => ArrayVector2D;