TypeScript Namespaces & Modules Cheat Sheet

// math.tsexport function add(a: number, b: number): number { return a + b; }export const PI = 3.14159;export default class Calculator { /* ... */ } // default export// app.tsimport Calculator, { add, PI } from './math';import * as MathUtils from './math'; // namespace import// Re-exportingexport { add as sum } from './math';export * from './math';

namespace Geometry {  export interface Point { x: number; y: number; }  export function distance(a: Point, b: Point): number {    return Math.sqrt((a.x - b.x) ** 2 + (a.y - b.y) ** 2);  }  // Nested namespaces  export namespace Shapes {    export class Circle { constructor(public radius: number) {} }  }}const p1: Geometry.Point = { x: 0, y: 0 };const c = new Geometry.Shapes.Circle(5);

// Attach static members/types to a class or function via a same-named namespaceclass Album {  constructor(public title: string) {}}namespace Album {  export function create(title: string): Album {    return new Album(title);  }}const a = Album.create('Abbey Road');