Jest: Cannot use export default in module

[syropian]

Apologies if this is a setup question, and not a bug, but it feels like a bug so...

I'm having a weird issue where Jest does not seem to work when using export default on a module. I've created a sample repo to reproduce the issue: https://github.com/syropian/jest-test

jest version: ^20.0.4
babel-jest version: ^20.0.3

The gist of it is, given this module:

const a = {
  greet () {
    return 'Hello World'
  }
}

const b = {
  foo () {
    return 'bar'
  }
}

export default {
  a,
  b
}

This works:

import myModule from '../src'

describe('My module', () => {
  it('works if I import the whole module', () => {
    const greeting = myModule.a.greet()
    const foo = myModule.b.foo()
    expect(greeting).toBe('Hello World')
    expect(foo).toBe('bar')
  })
})

but this results in a and b being undefined:

import { a, b } from '../src'

describe('My module', () => {
  it('works if I import individual exports', () => {
    const greeting = a.greet()
    const foo = b.foo()
    expect(greeting).toBe('Hello World')
    expect(foo).toBe('bar')
  })
})

Using node 7.3.0 and npm 5.0.0. Also tried node 8.0.0 with no luck.

[jgburet]

export const a = {
  greet: () => 'hello world',
};

export const b = {
  foo: () => 'bar',
};

export default function throwThat(that) {
  throw new Error(that);
}


// other file
import throwMessage, { a, b } from '../';

[syropian]

@etrnljg I know that's a workaround, but it does not explain why I can't pull in individual pieces from the default export. It works fine in other testing frameworks like Ava.

[SimenB]

It's not valid ESM. You export an object with two props, not different exports.

If it works in AVA, that's a bug there.

[jgburet]

I'm not sure you can destructure an object on an import.

Edit: yeah, exactly what @SimenB said.

[syropian]

@etrnljg @SimenB Oh you're right, I had to check the MDN on exports. I can optionally do:

export { a, b }

if I know I only want to pull in the individual exports. I did not realize it didn't work with default exports, since it had always worked with AVA. TIL!