Building custom jquery-ui

Building custom jquery-ui

Hi,
Is there an instruction on how to build jquery-ui in a similar way to building custon jquery ( https://github.com/jquery/jquery).
When I am trying to run npm run build I am getting an error : pm ERR! missing script: build?
There is build.js in subfolder: jquery-ui\build\tasks.
Is there also a list of modules that can be excluded from a build to create smallerjquery-ui?
Kind Regards,
Janusz