Reproduction link or steps

https://repl.rolldown.rs/#eNptkE0OwiAUhK/y8jaoaeqexJXHEGOoUlODD0Op1jTcXcD+2NgVZL6ZCUOHJfIOrdH6Yl6Unw2V1TV3dVQJ+RLJ8BxAdX8Y66CDiyorUvuEwUNpzR3YEGOCBKk2WYNRNjqdY2DVCQJQrVOWpOZwYMOdHbOIKno0jkOyBSM5+z5JDqy/5beaJd/AipEVkUXkBfm1IPQZTqlh34/y3dU/dtMPybeztnFM+I7agYQdMMmm6mibVydlsXpc+ldbxNoi6OhD8zNEtXSqdug/FZGSyQ==

What is expected?

Output bundle does not contain rollup/runtime code

What is actually happening?

Output bundle contains rollup/runtime code, which is not actually used!

System Info

Rollup Repl

Any additional comments?

If you comment export * from 'external' - rolldown/runtime is disappears from output