Crash for master branch when extending "plugin:react/all" in eslintrc

[golopot]

In master branch of this plugin, extending plugin:react/all in eslintrc cause a crash. This bug comes from #3429.

Reproduction:

mkdir demo-config-bug
cd demo-config-bug
npm init --yes
npm i eslint jsx-eslint/eslint-plugin-react#master
touch a.js
echo '{"extends": ["plugin:react/all"]}' > .eslintrc.json
npx eslint .

Result:
Oops! Something went wrong! :(

ESLint: 8.25.0

Error: ESLint configuration in .eslintrc.json » plugin:react/all is invalid:
- Unexpected top-level property "languageOptions".

@jjangga0214

[ljharb]

Thanks for catching that. The hope was that we can use the same imports in both config systems.

[ljharb]

@golopot can you try changing node_modules/eslint-plugin-react/configs/all.js to add Object.defineProperty(module.exports, 'languageOptions', { enumerable: false }); as the last line, and try again?

I'm wondering if making it non-enumerable will "hide" it from the legacy config's validation.

[golopot]

@ljharb Adding that line fixed the bug.

[ljharb]

Thanks@

@jjangga0214 can you confirm that with that line added, the new config system still works?