import type { ArrayVector3D } from "./types.js";
/**
 * Calculates the angle between two 3D vectors.
 * @param {ArrayVector3D} xyz1 - First vector as `[x, y, z]`
 * @param {ArrayVector3D} xyz2 - Second vector as `[x, y, z]`
 * @param {number} [m1] - Optional first vector magnitude (default: `magnitude3D(xyz1)`)
 * @param {number} [m2] - Optional second vector magnitude (default: `magnitude3D(xyz2)`)
 * @returns {number} Angle between the vectors in radians
 */
export declare const angleBetween3D: (xyz1: ArrayVector3D, xyz2: ArrayVector3D, m1?: number, m2?: number) => number;