import type { ArrayVector4D } from "./types.js";
/**
 * Checks if two 4D vectors are approximately equal within epsilon.
 * @param {ArrayVector4D} xyzw1 - First vector as `[x, y, z, w]`
 * @param {ArrayVector4D} xyzw2 - Second vector as `[x, y, z, w]`
 * @param {number} epsilon - Maximum difference (default: `Number.EPSILON`)
 * @returns {boolean} `true` if vectors are approximately equal, `false` otherwise
 */
export declare const isEqualApprox4D: (xyzw1: ArrayVector4D, xyzw2: ArrayVector4D, epsilon?: number) => boolean;