Node.js ES6 how to export class from module?

Question

I'm trying to export an ES6 class from a CommonJS module in Node.js 6.2.0

class MyClass{
    //class contents here
}

exports = MyClass;

Then import it in another module:

var MyClass = require('/path/to/module.js')
var instance = new MyClass();

However I'm getting the following exception:

TypeError: MyClass is not a constructor

How can I properly do it?

Please note that I'm not using Babel/Tranceur it's pure JS as implemented in the latest Node 6.2.0 which according to Kangax implements ES6 in 93%.

//Edit: this is not a problem with exports vs module.exports. While using exports alone I'm getting some object with __proto__ set.

Try logging what you get after requiring the module. _If it isn't a constructor, what is it?_ — sdgluck, May 23 '16 at 15:38
*"this is not a problem with exports vs module.exports"* Yes it is! `exports = MyClass;` doesn't export anything. It's a noop. `module.exports = ...;` is the way to export a single value from a module. The duplicate explains why `exports = ...;` doesn't work. — Felix Kling, May 23 '16 at 21:03
You should mark @Bergi answer as correct (by click on gray 'ceck' button on left side of his answer) — Kamil Kiełczewski, Dec 29 '16 at 21:27

score 37 · Answer 1 · answered May 23 '16 at 15:48

37

You will need to assign to module.exports, not the local exports variable.

answered May 23 '16 at 15:48

Bergi

2

@kubal5003: From that very article: "*`require` returns an object, which references the value of `module.exports` for a given file*". How is my answer wrong? Have you tried using `module.exports = MyClass`? – Bergi May 23 '16 at 19:14
2

@kubal5003: This answer is correct. If you don't believe that then you need to spend more time learning about Node/CommonJS modules. – Felix Kling May 23 '16 at 21:05
This worked for me. This should be accepted as solution. – Sarath Kumar Jan 10 '18 at 06:06

1 Answers1