circular reference in namespace export due to invalid import name

[IlyaSemenov]

A code like this:

import { Foo as Foo1 } from "./foo"

export namespace bar {
  export type Foo = Foo1
}

generates invalid d.ts:

type Foo = string;

declare namespace bar {
    type Foo = Foo; // Type alias 'Foo' circularly references itself. ts(2456)
}

export { bar };

Reproduction: https://stackblitz.com/edit/node-497knk

Run tsup bar.ts --dts and examine dist/bar.d.ts.

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[await-ovo]

It looks like a rollup-plugin-dts issue: Swatinem/rollup-plugin-dts#223