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Issue Description

In a project configured with "composite": true and installed with pnpm, TypeScript flags error TS2742 in this minimal eslint.config.mjs.

// @ts-check
import tseslint from "typescript-eslint";
export default tseslint.config(tseslint.configs.recommended);

eslint.config.mjs:3:1 - error TS2742: The inferred type of 'default' cannot be named without a reference to '.pnpm/@typescript-eslint+utils@8.25.0_eslint@9.21.0_typescript@5.7.3/node_modules/@typescript-eslint/utils/ts-eslint'. This is likely not portable. A type annotation is necessary.

Full tsconfig.json:

{
  "compilerOptions": {
    "allowJs": true,
    "composite": true,
    "module": "nodenext",
    "noEmit": true,
    "strict": true
  }
}

The error is not shown without "composite": true, nor is it shown when using npm instead of pnpm.

Related:

• Docs: add type annotation for tseslint.config() usage examples #10508
• fix(typescript-eslint): export types so that declarations can be named for dts files #10513 (merged in v8.18.2)

Reproduction Repository Link

https://gist.github.com/andersk/44d8dd0d3c2508f758bf51e5cbf12c2f

Repro Steps

$ git clone https://gist.github.com/andersk/44d8dd0d3c2508f758bf51e5cbf12c2f test
$ cd test
$ pnpm i
Packages: +116
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Progress: resolved 116, reused 116, downloaded 0, added 116, done

dependencies:
+ eslint 9.21.0
+ typescript 5.7.3
+ typescript-eslint 8.25.0

Done in 1.9s using pnpm v10.5.1

$ pnpm exec tsc
eslint.config.mjs:3:1 - error TS2742: The inferred type of 'default' cannot be named without a reference to '.pnpm/@typescript-eslint+utils@8.25.0_eslint@9.21.0_typescript@5.7.3/node_modules/@typescript-eslint/utils/ts-eslint'. This is likely not portable. A type annotation is necessary.

3 export default tseslint.config(tseslint.configs.recommended);
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Found 1 error in eslint.config.mjs:3

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