[api-extractor] Re-exporting of module "namespaces" across package boundaries yields malformed type roll-ups

[Josmithr]

Summary

See this repo for a repro of the issue: https://github.com/Josmithr/api-extractor-playground/tree/re-export-module-namespace

The repo contains 2 packages, package-a and package-b.
package-b depends on package-a, and both are configured with API-Extractor.

In this scenario, package-a contains a single root export, which is a "namespace" generated via:

import * as A from './NamespaceModule.js';
export { A };

It's type rollup, generated by API-Extractor looks like this:

declare namespace A {
	export { Foo, bar, Baz };
}
export { A };

/** @public */
declare const bar = 5;

/** @public */
declare interface Baz {
	value: string;
}

/** @public */
declare class Foo {}

export {};

package-b also contains a single root export, which is simply a re-export of namespace A from package-a.
It is also configured with package-a specified in its bundledPackages.
Its export looks like this:

export { A } from 'package-a';

I would expect package-b's type roll-up to look identical to that of package-a, but instead, a malformed rollup is generated:

export declare namespace A {
	{
		Foo, bar, Baz;
	}
}

export {};

Notice that the necessary imports are missing for Foo, bar, and Baz.

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
@microsoft/api-extractor version?	7.47.0
Operating system?	Linux (GitHub Codespace)
API Extractor scenario?	reporting (.api.md) / rollups (.d.ts) / docs (.api.json)
Would you consider contributing a PR?	Yes
TypeScript compiler version?	5.5.2
Node.js version (node -v)?	20.12.1

[iclanton]

@octogonz