It would be great if ncc build supported an option such as --filename to allow naming the generated file to something other than index.js.

It looks like the application was built to support this option in the future with the following lines already in place:

https://github.com/zeit/ncc/blob/0ad6971d202ee5896310f65e9aedfd1156184346/src/index.js#L39

https://github.com/zeit/ncc/blob/0ad6971d202ee5896310f65e9aedfd1156184346/src/index.js#L53

https://github.com/zeit/ncc/blob/0ad6971d202ee5896310f65e9aedfd1156184346/src/index.js#L131-L134