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//  triple-slash reference needs no module loading, only references at the top of consuming files

// geometry.ts will transpile into a plain .js

  class Square {
    constructor(public sideLength: number = 0) {
    }
    area() {
      return Math.pow(this.sideLength, 2);
    }
  }

//  main.ts needs a reference to geometry.ts for the class definition
//  this is done by a triple-slash reference

  ///	<reference path="geometry.ts" />
  var square = new Square(5);

// modules can export classes
module Geometry {
  export class Square {
    constructor(public sideLength: number = 0) {
    }
    area() {
      return Math.pow(this.sideLength, 2);
    }
  }
}

//  '.' can be used as separator for sub modules
var square = new Geometry.Square(5);

// upon import, local alias can be defined for referencing a module
import Geom = Geometry;
var square = new Geom.Square(10);

//  imports and exports across files need module loading (AMD, commonJS)
//  the chosen loader has to be added to the project stack separately

//  geometry.ts will transpile into a module with a syntax depending on the chosen loader

  export class Square {
    constructor(public sideLength: number = 0) {
    }
    area() {
      return Math.pow(this.sideLength, 2);
    }
  }

//  main.ts needs a reference to the class definition
//  this is done by using the same syntax as used in geometry.ts

  import { Square as SC } from "./geometry";
  square = new SC(4);