Comment by runjake

No, it does parsing and a bunch more. The Bun founder says it best in this comment:

"Bun is a batteries-included JavaScript & CSS transpiler (parser), minifier, bundler, npm-like package manager, Jest-like test runner, as well as runtime APIs like a builtin Postgres, MySQL and Redis client. This is naturally a ton of code."

https://news.ycombinator.com/item?id=48140921