[Bug]: exports from dev dependency bundle code but not types

[quentindutot]

Reproduction link or steps

https://stackblitz.com/edit/stackblitz-starters-fmqzdkjc

What is expected?

When exporting from an external package, the dts generation should generate the types matching the code bundled.

What is actually happening?

The code from the dev dependency gets bundled but not the types.

System Info

stackblitz

Any additional comments?

No response