Update stylelint to 16.0.0-3 and migrate test files to ESM

__tests__/engines.test.js → __tests__/engines.test.mjs

@@ -1,7 +1,7 @@
-'use strict';
+import { execFileSync } from 'node:child_process';
+import { readFileSync } from 'node:fs';
 
-const { execFileSync } = require('child_process');
-const pkg = require('../package.json');
+const pkg = JSON.parse(readFileSync(new URL('../package.json', import.meta.url), 'utf8'));
 
 describe('engines.node', () => {
 	it("is the same as stylelint's one", () => {

__tests__/index.test.js → __tests__/index.test.mjs

@@ -1,8 +1,6 @@
-'use strict';
-
-const config = require('../');
-const fs = require('fs');
-const stylelint = require('stylelint');
+import config from '../index.js';
+import fs from 'node:fs';
+import stylelint from 'stylelint';
 
 describe('flags no warnings with valid css', () => {
 	const validCss = fs.readFileSync('./__tests__/valid.css', 'utf-8');

package.json

@@ -23,8 +23,8 @@
     "lint": "npm-run-all --parallel lint:*",
     "release": "np",
     "pretest": "npm run lint",
-    "test": "jest",
-    "watch": "jest --watch"
+    "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
+    "watch": "npm test --ignore-scripts -- --watch"
   },
   "lint-staged": {
     "*.js": "eslint --cache --fix",
@@ -46,6 +46,9 @@
       "@stylelint/remark-preset"
     ]
   },
+  "jest": {
+    "testRegex": ".*\\.test\\.m?js$"
+  },
   "dependencies": {
     "stylelint-config-recommended": "github:stylelint/stylelint-config-recommended#prepare-14.0.0"
   },
@@ -62,10 +65,10 @@
     "npm-run-all": "^4.1.5",
     "prettier": "^2.8.8",
     "remark-cli": "^11.0.0",
-    "stylelint": "^16.0.0-0"
+    "stylelint": "^16.0.0-3"
   },
   "peerDependencies": {
-    "stylelint": "^16.0.0-0"
+    "stylelint": "^16.0.0-3"
   },
   "engines": {
     "node": ">=18.12.0"