8000 Bug: error TS2742 in eslint.config.mjs with `"composite": true` and pnpm · Issue #10893 · typescript-eslint/typescript-eslint · GitHub
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Bug: error TS2742 in eslint.config.mjs with "composite": true and pnpm #10893

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andersk opened this issue Feb 27, 2025 · 4 comments
Open
4 tasks done

Bug: error TS2742 in eslint.config.mjs with "composite": true and pnpm #10893

andersk opened this issue Feb 27, 2025 · 4 comments
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accepting prs Go ahead, send a pull request that resolves this issue bug Something isn't working good first issue Good for newcomers package: typescript-eslint Issues related to the typescript-eslint package

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@andersk
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andersk commented Feb 27, 2025 •
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Before You File a Bug Report Please Confirm You Have Done The Following...

  • I have tried restarting my IDE and the issue persists.
  • I have updated to the latest version of the packages.
  • I have searched for related issues and found none that matched my issue.
  • I have read the FAQ and my problem is not listed.

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:

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

Versions

package version
@typescript-eslint/eslint-plugin 8.25.0
@typescript-eslint/parser 8.25.0
@typescript-eslint/scope-manager 8.25.0
@typescript-eslint/typescript-estree 8.25.0
@typescript-eslint/type-utils 8.25.0
@typescript-eslint/utils 8.25.0
TypeScript 5.7.3
ESLint 9.21.0
node 22.14.0
@andersk andersk added bug Something isn't working triage Waiting for team members to take a look labels Feb 27, 2025
@bradzacher
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This is very similar to an issue that eslint upstream also had. Pnpm's linking installs plays a bit funky with typescript so it needs the package to declare some additional type exports for it to work.

@bradzacher bradzacher added good first issue Good for newcomers accepting prs Go ahead, send a pull request that resolves this issue package: typescript-eslint Issues related to the typescript-eslint package and removed triage Waiting for team members to take a look labels Feb 27, 2025
@fdendorfer
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I had the same error, but using a slightly different setup without tseslint.config(). I solved it by adding "eslint.config.mjs" to the exclude array in my tsconfig.json.

@ntnyq
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ntnyq commented Mar 13, 2025

Upstream related issue:

eslint/eslint#19421

ESLint recommended workaround:
https://eslint.org/docs/latest/use/getting-started#manual-set-up

@fdendorfer
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Thanks for the hint @ntnyq

I can confirm this also works for me

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