Is tree shaking possible when building a lib with tsup?

I know tsup is powered by esbuild which supports tree shaking by default. However, I don't see much details about this part on the doc sites. So I was wondering if tsup inherits this good nature and what I can reference to make a lib bundled with tsup tree shakable. Thanks!

Review the tsup documentation and the esbuild tree-shaking documentation referenced by the issue. Determine whether tsup inherits esbuild's behavior and what library authors should configure or reference; the documentation is done when this guidance is clearly explained.

Written by the indexing model from the issue text.