import type { ArrayVector4D } from "./types.js";
/**
 * Subtracts two 4D vectors.
 * @param {ArrayVector4D} xyzw1 - First vector as `[x, y, z, w]`
 * @param {ArrayVector4D} xyzw2 - Second vector as `[x, y, z, w]`
 * @returns {ArrayVector4D} The difference of the vectors
 */
export declare const subtract4D: (xyzw1: ArrayVector4D, xyzw2: ArrayVector4D) => ArrayVector4D;