import { V3 } from '@hscmap/angle';
export declare function clamp(x: number, a: number, b: number): number;
export declare function range(start: number, end?: number): number[];
export declare function square(x: number): number;
export declare function thetaphi2xyz(theta: number, phi: number): V3;
export declare function xyz2thetaphi(x: number, y: number, z: number): number[];
export declare function dot(a: V3, b: V3): number;
export declare function diff(a: V3, b: V3): V3;