🐛 Unused export * from "./b" line not reported

[guillaumebrunerie]

Prerequisites

• I'm using the latest version
• I've read the relevant documentation
• I've searched for existing issues
• I've checked the list of known issues
• I've read the issue reproduction guide

Reproduction url

https://codesandbox.io/p/devbox/wp5lv3

Reproduction access

• I've made sure the reproduction is publicly accessible

Description of the issue

I found a situation in which an export * from "./b"; line is unused (removing it makes no difference), but Knip doesn’t report anything:

// a.ts
export const a = "a";

// b.ts
export const b = "b";

// aAndB.ts
export * from "./a";
export * from "./b"; // Unused line?

// index.ts
import { a } from "./aAndB";
import { b } from "./b";
console.log(a, b);

Note that both a and b are used, but b is imported directly rather than being imported from the barrel file. This is a sign of a potential issue, that maybe b was meant to be imported from aAndB instead.

It’s not a big issue, as there isn’t any actual code that is unused (except from the export * line which will most likely disappear after bundling anyway), and supporting this use case would maybe require a whole new category of things that can be potentially unused, but I felt like I should report it anyway if you feel like it should be fixed.

[webpro]

Oh, interesting. It's simply not supported yet, but I guess it could be. Won't be trivial at first thought though, because that * in the barrel file is not an exporteded identifier (yet).

Edit: and the * is also often not unique either (like in the example).