import type { ArrayVector4D } from "./types.js";
/**
 * Checks if a 4D vector has NaN components.
 * @param {ArrayVector4D} xyzw - Vector as `[x, y, z, w]`
 * @returns {boolean} `true` if vector has `NaN` components, `false` otherwise
 */
export declare const isNan4D: (xyzw: ArrayVector4D) => boolean;