import { Vec3 } from 'quaternion';
declare global {
    interface Array<T> {
        norm: () => number;
        normsq: () => number;
        normalize: () => Array<T>;
    }
}
/**
 * Degree to radian conversion
 */
export declare const deg2rad: number;
/**
 * Radian to degree conversion
 */
export declare const rad2deg: number;
/**
 *
 * @param {Number} a angle in degrees
 * @returns Sin of angle
 */
export declare const sind: (a: number) => number;
/**
 *
 * @param {Number} a angle in degrees
 * @returns Tangent of angle
 */
export declare const tand: (a: number) => number;
/**
 *
 * @param {Number} a angle in degrees
 * @returns Cos of angle
 */
export declare const cosd: (a: number) => number;
/**
 *
 * @param {Array} a 1st Vector for cross product
 * @param {Array} b 2nd vector for cross product
 * @returns cross product of a & b
 */
export declare const cross: (a: Vec3, b: Vec3) => Vec3;
/**
 *
 * @param v1 vector 1
 * @param v2 vector 2
 * @returns vector dot product
 */
export declare const dot: (v1: Array<number>, v2: Array<number>) => number;
/**
 *
 * @param v1 vector 1
 * @param v2 vector 2
 * @returns vector with element-wise addition of 2 vectors
 */
export declare const eadd: (v1: Array<number>, v2: Array<number>) => Array<number>;
/**
 *
 * @param {Array} v1 Vector 1, a 3-element vector
 * @param {Array} v2 Vector 2, a 3-element vector
 * @returns Angle in radians between v1 and v2
 */
export declare const angleBetweenVectors: (v1: Vec3, v2: Vec3) => number;
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