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npm i https://pkg.pr.new/sxzz/rolldown-plugin-dts@72

commit: 2c35f85

Technically there is one. I have no idea how it didn't fail before. (source-map.test.ts/tsc)

Ok, after some playing around I found the following weird behavior:

This is the basic.ts file that is compiled in source-map.test.ts:

export const foo: number = 42

type SomeType<T> = T
type FooType = string
interface Interface {}

export function fn(arg0: SomeType<FooType>, opt: Interface): void {}

export enum Enum {
  A = 0,
  B = 1,
  C = 2,
}

export class Cls {
  foo: string
  fn(e: Enum): void {}
}

When I compile this without my fix there is no second source map comment.

As you see, this file includes 3 types that are not exported but still have to be included for the function fn, namely SomeType, FooType and Interface. If I change the types such that all members are exported by either exporting those 3 as well, changing the function to use string directly or completely removing the function, the superfluous comment appears.

It seams the bug get resolved in some other way already, when there are non exported types in the .d.ts file.

Thanks for your PR, but I fixed it in 7ca1234 using a much more robust approach instead of a regex.