/**
 * Convert from radians to degrees
 *
 * @param {number} radians
 * @returns {number} degrees
 */
export declare function radiansToDegrees(radians: number): number;
/**
 * Convert from degrees to radians
 *
 * @param {number} degrees
 * @returns {number} radians
 */
export declare function degreesToRadians(degrees: number): number;
/**
 * Normalize an arbitrary angle to the interval [-180, 180)
 *
 * @param {number} n
 * @returns {number}
 */
export declare function normalizeHalf(n: any): number;
/**
 * Normalize an arbitrary angle to the interval [0, 360)
 *
 * @param {number} n
 * @returns {number}
 */
export declare function normalize(n: any): number;
/**
 * Gets the shortest direction to rotate to another angle
 *
 * @param {number} from
 * @param {number} to
 * @returns {number}
 */
export declare function shortestDirection(from: any, to: any): 1 | 0 | -1;
/**
 * Checks if an angle is between two other angles
 *
 * @param {number} n
 * @param {number} a
 * @param {number} b
 * @returns {boolean}
 */
export declare function between(n: any, a: any, b: any): boolean;
/**
 * Calculates the angular difference between two angles
 * @param {number} a
 * @param {number} b
 * @returns {number}
 */
export declare function diff(a: any, b: any): number;
/**
 * Calculate the minimal distance between two angles
 *
 * @param {number} a
 * @param {number} b
 * @returns {number}
 */
export declare function distance(a: any, b: any): number;
/**
 * Calculate radians from current angle
 *
 * @param {number} n
 * @returns {number}
 */
export declare function toRad(n: any): number;
/**
 * Calculate degrees from current angle
 *
 * @param {number} n
 * @returns {number}
 */
export declare function toDeg(n: any): number;
/**
 * Calculate gons from current angle
 *
 * @param {number} n
 * @returns {number}
 */
export declare function toGon(n: any): number;
/**
 * Given the sine and cosine of an angle, what is the original angle?
 *
 * @param {number} sin
 * @param {number} cos
 * @returns {number}
 */
export declare function fromSinCos(sin: any, cos: any): number;
/**
 * What is the angle of two points making a line
 *
 * @param {Array} p1
 * @param {Array} p2
 * @returns {number}
 */
export declare function fromSlope(p1: any, p2: any): number;
/**
 * Returns the quadrant
 *
 * @param {number} x The point x-coordinate
 * @param {number} y The point y-coordinate
 * @param {number=} k The optional number of regions in the coordinate-system
 * @param {number=} shift An optional angle to rotate the coordinate system
 * @returns {number}
 */
export declare function quadrant(x: any, y: any, k: any, shift: any): number;
/**
 * Calculates the compass direction of the given angle
 *
 * @param {number} angle
 * @returns {string}
 */
export declare function compass(course: any): string;
/**
 * Calculates the linear interpolation of two angles
 *
 * @param {number} a Angle one
 * @param {number} b Angle two
 * @param {number} p Percentage
 * @param {number} dir Direction (either 1 [=CW] or -1 [=CCW])
 * @returns {number}
 */
export declare function lerp(a: any, b: any, p: any, dir: any): any;