When creating an sfx bundle where every module in the tree is ES6, we can then take advantage of deep static optimizations.

The way to do this would be to call directly to a compiler like https://github.com/rollup/rollup in this optimization case.

@Rich-Harris as discussed before this would be very useful to allow users to actually author and distribute standalone ES6 projects through jspm - if you have any implementation tips or advice please do share here.

/cc @amcdnl