How can widgets use UI frameworks such as ANTD and Bootstrap
@kingkiller are you referring to existing widgets or your new custom ones?
For existing widgets it will require some substantial effort from your part to migrate to a different UI framework as the project currently uses React.
For new custom extensions you are free to use whichever UI framework you require or are comfortable with.
You can see past discussions on the subject:
Thank you. It means a lot to me