Using webpack in development and rollup in production

Ionic Framework ionic-v3
#1

Can anyone suggest how to use rollup in production instead of webpack ?

I think by default ionic2 uses webpack(not sure if it changed in recent release).
and also how much improvement in performance can be experienced after implementation of rollup?

Thanks in advance.

#2

Why do you want to do that?

#3

Instead of using default module bundler(that is webpack) i want to use rollup module bundler in production. Because the build created after rollup is much smaller than webpack.
So how to shift to rollup?