How to disable excess code splitting

[KristjanTammekivi]

Hi, I have a package hein.
I want to start using tsdown but while testing I ran into an issue where expect.types.ts gets split into chunks because there are multiple entry points, one of them being hein/expect.types. Hein can accept plugins that also augment modules via declare module 'hein/expect.types' { as seen here

Because expect.types gets split into several chunks the module that needs to be augmented is no longer expect.types but something like expect.types-cfe3trq or whatever, with expect.types just reexporting from the split off chunk.

I've tried adding a separate entry into the array of configurations but this means that the types that I want to augment get duplicated into index.js/index.cjs and augmenting expect.types won't do anything about the types in index.

Here's my tsdown config for now
https://github.com/KristjanTammekivi/hein/blob/esm-migration/packages/hein/tsdown.config.ts

[sxzz]

See rolldown/rolldown#4437

[sxzz]

You can set your configuration as an array with three items.

[KristjanTammekivi]

Thanks, preserveModules did the trick!

I tried splitting the configuration into multiple array items but then the code got duplicated and augmenting the types didn't have an effect on the actual code sadly.