Hi Christoph Gasser,
Thanks for your interest in Syncfusion Products.
You can generate JS file for specific controls from our online Custom Script Generator by selecting the required controls alone and you can use that file in your application.
Refer to the following link for the Custom Script Generator site:
Refer to the following link for the documentation:
Also, we have support for the Require JS, refer to the following documentation:
Let us know if you have any further queries.
Regards,
Koushik R