Summary

We have an unexported interface declaration in one of our namespaces:

export namespace foo {
  interface Bar {
    name: string;
  }

  export interface BarEx extends Bar {
    score: number;
  }
}

This results in the following API report:

// @public (undocumented)
export namespace foo {
    // (undocumented)
    export interface Bar {
        // (undocumented)
        name: string;
    }
    // (undocumented)
    export interface BarEx extends Bar {
        // (undocumented)
        score: number;
    }
        {};
}

Notice the empty {}; line at the end. Exporting the interface Bar makes it go away.

Repro steps

See above.

Standard questions

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