import type { ArrayVector4D } from "./types.js";
/**
 * Calculates the squared magnitude of a 4D vector.
 * Faster than magnitude for comparisons.
 * @param {ArrayVector4D} xyzw - Vector as `[x, y, z, w]`
 * @returns {number} The squared magnitude
 */
export declare const magnitudeSq4D: (xyzw: ArrayVector4D) => number;