Import ThunderJS fails in webpack

[achille1789]

Hi, I am trying to import ThunderJS on my webapp as described on the README.md: import ThunderJS from 'ThunderJS'
My app uses webpack to build up and importing ThunderJS it crashes:

I don't have issues to import any other library.
Currently I have to import ThunderJS in this way: import ThunderJS from 'ThunderJS/module/thunderJS'

Can you advise if I am doing something wrong please? Thanks.

Side note: latest ThunderJS release is 1.2.5 but on the package.json the version is still 1.2.4