ES6 Re-exports doesn't resolve inner types

Hi there! Need some help with this plugin setup as I’m not able to get proper types. Not sure if it’s the plugin or a typescript config.

I’m trying to create a react component library with components namely exported from an entry file and each of them re-exported by their own barrel:

├── src
│   ├── Foo
│   │   ├── Foo.tsx
│   │   └── index.ts
│   ├── Bar
│   │   ├── Bar.tsx
│   │   └── index.ts
└── index.ts

And after compiling get two files: index.js and index.d.ts. But the d.ts file does not include the inner component types. It’s just a single line with an export.

export { default as Bar, default as Foo };

Reproduction

By having a project set up like:

// Foo/Foo.tsx
import { FC } from "react";

const Foo: FC<{
  name: string;
}> = ({ name }) => <h2>Foo {name}</h2>;

export default Foo;

// Foo/index.ts
export { default } from "./Foo";

// index.ts
export { default as Foo } from "./Foo";

// rollup.config.js
import ts from "rollup-plugin-ts";

export default {
  input: "./src/index.ts",
  output: {
    dir: "./build",
    format: "es",
  },
  external: ["react/jsx-runtime"],
  plugins: [ts()],
};

Results in a in a d.ts file like:

export { default as Foo };

But if instead of using re-export use import and then export works fine.

// Foo/index.ts
import Foo from "./Foo";
export default Foo

Expected Result

import { FC } from 'react';

interface BarProps {
    lastName: string;
}
declare const Bar: FC<BarProps>;

interface HelloWorldProps {
    name: string;
}
declare const Foo: FC<HelloWorldProps>;

export { Bar, Foo };

Actual Results

export { default as Bar, default as Foo };

Environment

• Version: 2.0.5
• Rollup Version: 2.70.2
• Operating System and version: macOS
• Node Version (npm version): node v16.14.2 (npm v8.5.0)
• Repo with bug reproduction: https://github.com/diego-toro/rollup-ts-reexport-bug

[wessberg]

That’s great, I’ll point to that issue in the release notes.

[diego-toro]

That’s awesome! and… Oh shut. Just filed a new issue for it https://github.com/wessberg/rollup-plugin-ts/issues/178 You can close it right away.