Inferring return types with import attributes causes debug assertion.

[dragomirtitian]

🔎 Search Terms

infer return type import attributes

🕗 Version & Regression Information

• This is a crash

⏯ Playground Link

Playground Link

💻 Code

// @module: NodeNext

// @filename: node_modules/inner/index.d.mts
export const esm = true;

// @filename: node_modules/inner/package.json
{ "name": "inner", "exports": { "./mjs": "./index.mjs" } }

// @filename: foo.ts
export /*a*/function/*b*/ fn() {
    return import("inner/mjs")
}

🙁 Actual behavior

Using infer return type on fn will cause a debug assertion.

🙂 Expected behavior

Should infer the return type.

Additional information about the issue

Found while working on isolated declaration.

It's caused by ImportAttributes not going through the full emit pipeline and thus not having their position assigned if they are part of an import type node.

[SarthakNikhal]

Hey! Can I work on this issue?

[jakebailey]

This already has a PR: #56395

Also, see https://github.com/microsoft/TypeScript/blob/main/CONTRIBUTING.md#issue-claiming