Supporting vaadin 14 production mode

"The addon only work in development mode, but in production mode it is not showing."
See: Michele Casagranda2's comments at Vaadin Driectory discussion:
https://vaadin.com/directory/component/wysiwyg-e-rich-text-editor-component-for-java/discussions

I have the same issue :/ Is there any idea what would be the cause? I'am fairly new at this node/bower version of vaadin.
