require-stylelint-extends-packages-installed

Require top-level Stylelint extends package specifiers to be listed in workspace dependencies.

Targeted pattern scope

This rule targets Stylelint config modules such as stylelint.config.ts, stylelint.config.mjs, and .stylelintrc.js.

It focuses on top-level exported config objects, including configs wrapped in defineConfig(...).

What this rule reports

Reports package-backed extends entries that do not resolve to a declared dependency in the nearest workspace package.json.

Why this rule exists

Shared Stylelint configs should reference installed packages explicitly. Missing dependency declarations create non-reproducible lint behavior across machines and CI jobs.

❌ Incorrect

export default {
    extends: ["stylelint-config-does-not-exist"],
    rules: {},
};

✅ Correct

export default {
    extends: ["stylelint-config-standard"],
    rules: {},
};

Behavior and migration notes

This rule reports unresolved package references and does not auto-fix because dependency installation strategy is repository-specific.

ESLint flat config example

import stylelint2 from "eslint-plugin-stylelint-2";

export default [stylelint2.configs.configuration];

When not to use it

Do not use this rule if your repository intentionally resolves extends packages through non-package-manager mechanisms.

Package documentation

Stylelint package documentation:

Rule catalog ID: R033

Further reading

• Stylelint extends