import type { ArrayVector2D } from "./types.js";
/**
 * Projects one 2D vector onto another.
 * @param {ArrayVector2D} xy1 - Vector to project
 * @param {ArrayVector2D} xy2 - Vector to project onto
 * @param {number} [m1] - Optional magnitude of the first vector (default: `magnitude2D(xy1)`)
 * @param {number} [m2] - Optional magnitude of the second vector (default: `magnitude2D(xy2)`)
 * @returns {ArrayVector2D} The projected vector
 */
export declare const project2D: (xy1: ArrayVector2D, xy2: ArrayVector2D, m1?: number, m2?: number) => ArrayVector2D;