Reproduction link or steps

Minimal reproduction repo:
Example Repo with problem

This monorepo is based on the template from typescript-monorepo.

This is the tsconfig base: codecompose

Steps to reproduce:

1. Clone the reproduction repo
2. Run pnpm install and pnpm build
3. Open this file packages/core/src/db-refs.ts
4. Click "Go to Definition" on a property (e.g mutation_count) of variable counter. Line: 14
5. Observe it navigates to wrong file/location

What is expected?

I expect that the generated maps are correct. And that when i use "Go To Declaration" it takes me to the correct file and line.

What is actually happening?

1. The index.d.mts.map has sourcesContent as an empty array []
2. When clicking "Go to Definition" on a type name, it navigates to the correct folder but a random file
3. When clicking on a property of that type, it navigates to a completely unrelated file and highlights an unrelated property

Note: This worked correctly in tsdown 0.14.2, but that version had issues with the syntax:

export * as types from './types.ts'

The latest version does not have that issue that export syntax but has broken sourcemaps.

Output:

{
  "version": 3,
  "file": "index.d.mts",
  "names": [],
  "sources": [
    "../src/are-we-there-yet.ts",
    "../src/document-types.ts",
    "../src/utils/get-error-message.ts",
    "../src/utils/invariant.ts",
    "../src/utils/is-empty.ts",
    "../src/utils/is-present.ts",
    "../src/utils/unique.ts"
  ],
  "sourcesContent": [],
  "mappings": ";;;;iBACgB,aAAA,CAAA;;;;;;AAAhB;;KCIY,OAAA;;EAAA,UAAO,EAEL,WAAA;;;;;;;;;ADNd;iBEIgB,eAAA;;;iBCLA,SAAA;;;;;;AHChB;iBIGgB,OAAA;;;iBCJA,gBAAgB,4BAA4B;iBAI5C,gBAAgB,qBAAqB;iBAIrC,eAAe,gBAAgB;;;iBCN/B,4CAA4C,IAAC,0CAAA,CAAA,QAAA"
}

Any additional comments?

• Empty sourcesContent: [] suggests source files aren't being embedded
• The sources array has correct relative paths
• The mappings field exists but appears to map to wrong locations

Is there a version between 0.14.2 and 0.18.4 that:

• Supports export * as types from './types.ts' syntax
• Generates correct sourcemaps with populated sourcesContent

Or is there a config option to fix the sourcemap generation?