feat: add @nl-design-system/eslint-config

Add a new package @nl-design-system/eslint-config and immediately eat
our own dogfood by using it in the basis repo itself.

eslint-plugin-import was more or less replaced by
eslint-plugin-perfectionist that provides similar functionality and
more.

Rename config files for tools that support importing their config
instead of requiring it.

Improve lint-staged by running both prettier and eslint (and stylelint)
on files that support both.

.husky/pre-commit

@@ -1 +1 @@
-pnpm exec lint-staged
+lint-staged

eslint.config.mjs

@@ -0,0 +1 @@
+export { default } from '@nl-design-system/eslint-config';

lint-staged.config.mjs

@@ -0,0 +1,7 @@
+export default {
+  '*.{css,scss}': ['stylelint --allow-empty-input --fix', 'prettier --write'],
+  '*.{js,cjs,mjs,json,jsx,mdx,ts,tsx}': ['eslint --no-error-on-unmatched-pattern --fix', 'prettier --write'],
+  '*.{yml,yaml}': 'prettier --write',
+  '*.md': ['markdownlint', 'prettier --write'],
+  'package.json': 'npmPkgJsonLint --allowEmptyTargets',
+};

package.json

@@ -20,16 +20,12 @@
   },
   "devDependencies": {
     "@changesets/cli": "2.27.8",
+    "@nl-design-system/eslint-config": "workspace:*",
     "@nl-design-system/tsconfig": "workspace:*",
     "@types/node": "20.14.13",
     "@typescript-eslint/eslint-plugin": "8.6.0",
     "@typescript-eslint/parser": "8.6.0",
-    "eslint": "8.57.1",
-    "eslint-config-prettier": "9.1.0",
-    "eslint-plugin-import": "2.30.0",
-    "eslint-plugin-json": "3.1.0",
-    "eslint-plugin-mdx": "3.1.5",
-    "eslint-plugin-react": "7.36.1",
+    "eslint": "9.13.0",
     "husky": "9.1.6",
     "lint-staged": "15.2.10",
     "markdownlint-cli": "0.41.0",
@@ -48,13 +44,13 @@
     "clean": "pnpm --recursive run clean",
     "lint": "npm-run-all --continue-on-error lint:** lint-workspaces",
     "lint:css": "stylelint --allow-empty-input '**/*.{css,scss}'",
-    "lint:js": "eslint --ext .js,.cjs,.mjs,.json,.jsx,.mdx,.ts,.tsx --report-unused-disable-directives .",
+    "lint:js": "eslint",
     "lint:md": "markdownlint '**/*.md'",
     "lint:package-json": "npmPkgJsonLint .",
     "lint:package-lock": "pnpm ls --recursive",
     "lint-fix": "npm-run-all --continue-on-error lint-fix:** prettier",
     "lint-fix:css": "stylelint --fix '**/*.{css,scss}'",
-    "lint-fix:js": "eslint --ext .js,.cjs,.mjs,.json,.jsx,.mdx,.ts,.tsx --fix --report-unused-disable-directives .",
+    "lint-fix:js": "eslint --fix",
     "lint-fix:md": "markdownlint --fix '**/*.md'",
     "lint-workspaces": "pnpm --recursive --if-present run lint",
     "lint-build": "pnpm --recursive --if-present run lint-build",