* remove closure-compiler, the current rollup plugin isn't really maintained and we were seeing frequent issues with metro and bundles compiled by closure

* add changeset

* Update curvy-bobcats-fry.md

* Remove hoist options from Terser

* Remove version from ephemeral package.json

* Remove babel-plugin-closure-elimination

* Add transformation to clean up function expressions

Buble/Babel (and transformers in general) like to transform
arrow functions to function expressions on variable declarations.
At the toplevel of modules we can clean this up by replacing them
with function declarations, which leads to cleaner minifier output.

* Expand function expression transformer to more safe cases
Co-authored-by: Phil Pluckthun <phil@kitten.sh>