What version of Oxlint are you using?

1.50.0

What command did you run?

oxlint

What does your .oxlintrc.json (or oxlint.config.ts) config file look like?

import { defineConfig } from "oxlint";
// @ts-expect-error @pandacss/eslint-plugin has no type declarations
import pandacss from "@pandacss/eslint-plugin";

export default defineConfig({
  jsPlugins: [{ name: "@pandacss", specifier: "@pandacss/eslint-plugin" }],
  rules: {
    ...pandacss.configs.recommended.rules,
    "@pandacss/no-escape-hatch": "warn",
    "@pandacss/no-important": "warn",
    "@pandacss/prefer-longhand-properties": "warn",
    "@pandacss/prefer-atomic-properties": "warn",
  },
});

What happened?

When using jsPlugins with a plugin that internally uses synckit (such as @pandacss/eslint-plugin), oxlint silently drops all warnings from that plugin when more than one thread is used (the default).

No diagnostic is emitted — the output simply shows Found 0 warnings and 0 errors.

Steps to Reproduce

1. Install @pandacss/eslint-plugin and configure it via jsPlugins:

   // oxlint.config.ts
   import { defineConfig } from "oxlint";
   import pandacss from "@pandacss/eslint-plugin";
   
   export default defineConfig({
     jsPlugins: [{ name: "@pandacss", specifier: "@pandacss/eslint-plugin" }],
     rules: {
       ...pandacss.configs.recommended.rules,
       "@pandacss/prefer-atomic-properties": "warn",
     },
   });

2. Create a source file with a violation:

   // src/App.tsx
   import { css } from "./styled-system/css";
   
   export function App() {
     return <div className={css({ background: "red", padding: "4" })} />;
   }

3. Run oxlint (default: uses multiple threads):

   Found 0 warnings and 0 errors.
   

   Expected warnings are silently missing. The same occurs with --threads=2, confirming any thread count above 1 triggers the issue.

4. Run oxlint --threads=1:

   ! @pandacss(prefer-atomic-properties): Use atomic properties instead of `background`. ...
   ! @pandacss(prefer-atomic-properties): Use atomic properties instead of `padding`. ...
   Found 2 warnings and 0 errors.
   

   Warnings appear correctly.

Expected Behavior

Warnings from @pandacss/eslint-plugin are reported correctly regardless of the number of threads, as they are with --threads=1.

Actual Behavior

Warnings are silently dropped. No diagnostic output or error message appears, so the failure is completely invisible to the user.

Environment

Workaround

Add --threads=1 to the oxlint command:

{
  "scripts": {
    "lint": "oxlint --threads=1"
  }
}