import type { ArrayVector3D } from "./types.js";
/**
 * Gets the angle between a 3D vector and the positive x-axis in radians.
 * @param {ArrayVector3D} xyz - Vector as `[x, y, z]`
 * @returns {number} Angle in radians, always in the range [0, 2π)
 */
export declare const angleX3D: (xyz: ArrayVector3D) => number;