import type { ArrayVector3D } from "./types.js";
/**
 * Checks if two 3D vectors are opposite.
 * @param {ArrayVector3D} xyz1 - First vector as `[x, y, z]`
 * @param {ArrayVector3D} xyz2 - Second vector as `[x, y, z]`
 * @returns {boolean} `true` if the vectors are opposite, `false` otherwise
 */
export declare const isOpposite3D: (xyz1: ArrayVector3D, xyz2: ArrayVector3D) => boolean;