🛠 Tooling: Closure Compiler

[JoshuaKGoldberg]

Tooling Report Checklist

• [X] I have tried restarting my IDE and the issue persists.
• [X] I have pulled the latest main branch of the repository.
• [X] I have searched for related issues and found none that matched my issue.

Overview

Google's Closure Compiler for many years was considered best-in-class for JavaScript minification+uglification. It might be useful for making distributed bundles even smaller.

Additional Info

https://www.npmjs.com/package/google-closure-library-webpack-plugin looks like the current Webpack 5 latest-and-greatest.