Because:

1. Uglify is no longer maintained

2. Babel@7 (Use Babel@7 #11) is our doorway into ESM builds

3. Bundles with ES2015+ output are already failing

Unfortunately, these dependencies are still using UglifyJS:

• html-minify (via html-webpack-plugin) ~> [email protected]
• webpack@4 ~> [email protected] ❗️
• sw-precache-webpack-plugin ~> [email protected]