/**
 * Adds two vec4's.
 */
export function add(out: number[], a: number[], b: number[]): number[];

/**
 * Creates a new vec4 initialized with values from an existing vector.
 */
export function clone(a: number[]): number[];

/**
 * Copy the values from one vec4 to another.
 */
export function copy(out: number[], a: number[]): number[];

/**
 * Creates a new, empty vec4.
 */
export function create(): number[];

/**
 * Calculates the euclidian distance between two vec4's.
 */
export function distance(a: number[], b: number[]): number;

/**
 * Divides two vec4's.
 */
export function divide(out: number[], a: number[], b: number[]): number[];

/**
 * Calculates the dot product of two vec4's.
 */
export function dot(a: number[], b: number[]): number;

/**
 * Creates a new vec4 initialized with the given values.
 */
export function fromValues(x: number, y: number, z: number, w: number): number[];

/**
 * Returns the inverse of the components of a vec4.
 */
export function inverse(out: number[], a: number[]): number[];

/**
 * Calculates the length of a vec4.
 */
export function length(a: number[]): number;

/**
 * Performs a linear interpolation between two vec4's.
 */
export function lerp(out: number[], a: number[], b: number[], t: number): number[];

/**
 * Returns the maximum of two vec4's.
 */
export function max(out: number[], a: number[], b: number[]): number[];

/**
 * Returns the minimum of two vec4's.
 */
export function min(out: number[], a: number[], b: number[]): number[];

/**
 * Multiplies two vec4's.
 */
export function multiply(out: number[], a: number[], b: number[]): number[];

/**
 * Negates the components of a vec4.
 */
export function negate(out: number[], a: number[]): number[];

/**
 * Normalize a vec4.
 */
export function normalize(out: number[], a: number[]): number[];

/**
 * Generates a random vector with the given scale.
 */
export function random(out: number[], scale: number): number[];

/**
 * Scales a vec4 by a scalar number.
 */
export function scale(out: number[], a: number[], b: number): number[];

/**
 * Adds two vec4's after scaling the second operand by a scalar value.
 */
export function scaleAndAdd(out: number[], a: number[], b: number[], scale: number): number[];

/**
 * Set the components of a vec4 to the given values.
 */
export function set(out: number[], x: number[], y: number[], z: number, w: number): number[];

/**
 * Calculates the squared euclidian distance between two vec4's.
 */
export function squaredDistance(a: number[], b: number[]): number;

/**
 * Calculates the squared length of a vec4.
 */
export function squaredLength(a: number[]): number;

/**
 * Subtracts vector b from vector a.
 */
export function subtract(out: number[], a: number[], b: number[]): number[];

/**
 * Transforms the vec4 with a mat4..
 */
export function transformMat4(out: number[], a: number[], m: number[]): number[];

/**
 * Transforms the vec4 with a quat.
 */
export function transformQuat(out: number[], a: number[], q: number[]): number[];