How to solve the "module has no exported member" error?

I am following instructions from the this answer, but cannot make the solution work.

Overview

I want to use import { Type } from "Module" instead of /// <reference path="..." />

Structure

-app\ -ViewModel.ts -Program.ts 

ViewModel.ts

export module Demo { export class ViewModel { constructor(public test: string) { } } } 

Program.ts

import { ViewModel } from "ViewModel"; 

Module 'C:/DemoApp/app/ViewModel' has no exported member 'ViewModel'.

and...

Only 'amd' and 'system' modules are supported alongside --outFile.

Goal

I want to be able to reference dependencies so that they compile to a single file in order.

If I add "module": "system" I still get the 1st of the aforementioned errors.

As per the 1st solution, I do not want to lose namespaces.

3 Answers

Remove the line below from your statement

export module Demo 

and use it like

export class ViewModel { constructor(public test: string) { } } 

Edit: For namespace, just do something like

namespace Demo { export class ViewModel { constructor(public test: string) { } } } 

One reason can be typo.

export const Demo = () => {} cannot be exported if it does not return a value. export const Demo =()=> () can be exported without return. 

May not be or check the module which you're using there.

export a () => { console.log("Hello world!"); }