Summary

A namespace can export a member that gets trimmed away. If that namespace then gets exported, it still tries to export the trimmed member when generating the rollup.

Repro steps

Demo code:

// index.ts
import * as ns from './ns';
export { ns };

// ns.ts
/** @public */
export const PUBLIC = 'PUBLIC';

/** @internal */
export const INTERNAL = 'INTERNAL';

Expected result:

/** @public */
declare const PUBLIC = "PUBLIC";

declare namespace ns {
  export {
    PUBLIC
  }
}
export { ns }

Actual result:

/** @public */
declare const PUBLIC = "PUBLIC";

declare namespace ns {
  export {
    PUBLIC,
    INTERNAL
  }
}
export { ns }

As can be seen, while the declaration of INTERNAL is stripped, the namespace still tries to export it.

Details

Probably related to the recent import * as __ from __ feature (#1029/#1796) and maybe #1664?.

Standard questions

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