webpack: Spread Operator bug?

Bug. I’m requiring a file with the following statement (using require because I’ll be using both on node and browser):

const user = require('skeemas/complexUser');

The working complexUser:

const user = require('./user');
const individual = require('./individual');
const company = require('./company');
const credential = require('./credential');

const complexUser = {
    type: {
        type: 'text',
        values: ['individual', 'company'],
        predefined: 'individual',
    }
}

Object.assign(complexUser, user, individual, company, credential);

module.exports = complexUser;

The NOT working complexUser:

const user = require('./user');
const individual = require('./individual');
const company = require('./company');
const credential = require('./credential');

module.exports = {
    type: {
        type: 'text',
        values: ['individual', 'company'],
        predefined: 'individual',
    },
    ...user,
    ...individual,
    ...company,
    ...credential,
};

Error thrown by Webpack:

 ERROR in ./node_modules/skeemas/complexUser.js
    Module parse failed: /Users/damz/Desktop/repmemo/node_modules/skeemas/complexUser.js Unexpected token (12:4)
    You may need an appropriate loader to handle this file type.
    |         predefined: 'individual',
    |     },
    |     ...user,
    |     ...individual,
    |     ...company,
     @ ./models/user.js 1:13-43
     @ ./models/userPresenter.js
     @ ./apps/user/components/profileForm.js
     @ ./apps/user/router.js
     @ ./apps/user/index.js

Both babel and node do not complain if running the file directly (https://goo.gl/E3ZSEq).