Hyperstack doesn't work in production

**Reproduction steps:**

- create a new hyperstack project

- compile assets with `bundle exec rake assets:precompile`

- start server in production environnment

- Open your browser on localhost:3000

**Expected result**

Page should load without javascript errors

**Actual result:**

The page is blank with the following error:

`Uncaught ReferenceError: require is not defined`

**Solution**

I think this is due to the following line:

hyper-component-1.0.alpha1.8/lib/hyper-component.rb:7

`Hyperstack.js_import 'react_ujs', defines: 'ReactRailsUJS'`

sprockets-rails opens node_modules/react_ujs/package.json in order to determine the file to insert in application.js.
Unfortunally "main" is equal to react_ujs/index.js and this file contains "var React=require("react")"
I don't understand why "main" is not equal to react_ujs/dist/react_ujs.js.

My solution is to replace hyper-component-1.0.alpha1.8/lib/hyper-component.rb:7 by:

`Hyperstack.js_import 'react_ujs/react_ujs/dist/react_ujs.js', defines: 'ReactRailsUJS'`