Because rollup doesn't (yet?) have good support for .ts files as config files, all of the
rollup.config files in the repo, as well as the in-repo code that they use, are written in .js.
Because rollup doesn't (yet?) have good support for .ts files as config files, all of the
rollup.config files in the repo, as well as the in-repo code that they use, are written in .js.