error when build for production

[woyehenni]

Thank you for your work.
There hava a error when build for production

ionic build --prod

ERROR in : Unexpected value 'BackButtonTabsModule in demo-ionic-tabs-back-button/node_modules/ion-back-button-tabs/bundles/ion-back-button-tabs.umd.js' imported by the module 'GlobalPageTwoPageModule indemo-ionic-tabs-back-button/src/app/global-page-two/global-page-two.module.ts'. Please add a @NgModule annotation.

[ERROR] An error occurred while running subprocess ng.

This can be reproduced in your demo project.
https://github.com/servrox/demo-ionic-tabs-back-button

[woyehenni]

Maybe missed the index.d.ts file which should publish to npm?