Error using nested namespaces "UnsupportedSyntaxError: namespace must have a "ModuleBlock" body."

[danielpza]

Problem

I get this error when trying to compile the following with pkgroll:

UnsupportedSyntaxError: namespace must have a "ModuleBlock" body.

declare namespace foo.bar {
  interface A {
    b: string;
  }
}

export { foo };

Seems related to Swatinem/rollup-plugin-dts#246

Expected behavior

bundles it as is, same output as typescript compiler

Minimal reproduction URL

https://github.com/danielpza/pkgroll-namespace-issue

See https://github.com/danielpza/pkgroll-namespace-issue/actions/runs/10288771843/job/28474986787

Version

2.4.2

Node.js version

22.4.1

Package manager

npm

Operating system

Linux

Bugs are expected to be fixed by those affected by it

• I'm interested in working on this issue

Compensating engineering work financially will speed up resolution

• I'm willing to offer financial support

[privatenumber]

Can't open your reproduction repo. Is it private?

I'm curious if this isn't something that can be solved with declare module 'file' {}

[danielpza]

Can't open your reproduction repo. Is it private?

yes, sorry. Made it public now

[wighawag]

I have a similar issue and it seems it indeed related to rollup-plugin-dts

for my case I have an issue similar to Swatinem/rollup-plugin-dts#162

It is tagged as wontfix. is there a way to disable rollup-plugin-dts and still benefit from dts ?