Potential side effect imports preserved in ESM .d.ts #391
Description
Reproduction link or steps
https://github.com/SuperchupuDev/tsdown-repro/tree/dts-import
What is expected?
Useless imports not being in the .d.ts file, just like .d.cts
What is actually happening?
They are preserved
Any additional comments?
I'm guessing it's probably caused by the fix for #273.
picomatch sets "sideEffects": false on its package.json, so it's not right for tsdown to detect it as a module that potentially produces side effects 🤔 but that's a separate issue