feat!: update all rules and switch to eslint@9

.editorconfig

@@ -1,9 +1,20 @@
-# editorconfig.org
+root = true
 
 [*]
-indent_style = space
+indent_style = tab
 indent_size = 2
 end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+max_line_length = 80
+
+[*.{yml,yaml,json}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.snap]
+trim_trailing_whitespace = false

.github/workflows/test.yml

@@ -0,0 +1,32 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        node-version: [20.x, 22.x, 24.x]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          architecture: ${{ steps.calculate_architecture.outputs.result }}
+          cache: "npm"
+      - run: npm ci
+      - run: npm run lint
+      - uses: codecov/codecov-action@v5
+        with:
+          flags: integration
+          token: ${{ secrets.CODECOV_TOKEN }}

.gitignore

@@ -8,6 +8,9 @@ pids
 *.pid
 *.seed
 
+# IDE
+.idea
+
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov
 
@@ -28,10 +31,10 @@ build/Release
 
 # Dependency directories
 node_modules
-jspm_packages
 
-# Optional npm cache directory
+# Cache directories
 .npm
+.eslintcache
 
 # Optional REPL history
 .node_repl_history

.prettierrc.js

@@ -0,0 +1 @@
+export { default } from "./prettier-config.js";

README.md

@@ -1,7 +1,6 @@
 [![npm][npm]][npm-url]
 [![test][test]][test-url]
-[![coverage][cover]][cover-url]
-[![chat][chat]][chat-url]
+[![discussions](https://img.shields.io/github/discussions/webpack/webpack)](https://github.com/webpack/webpack/discussions)
 
 <div align="center">
   <!-- replace with accurate logo e.g from https://worldvectorlogo.com/ -->
@@ -14,56 +13,32 @@
   <p>Provides Webpacks's .eslintrc as an extensible shared config.<p>
 </div>
 
-<h2 align="center">Install</h2>
+# eslint-config-webpack
+
+## Install
 
 ```bash
 npm i -D eslint-config-webpack
 ```
 
-<h2 align="center">Usage</h2>
-
-Webpack's eslint config contains all of our ESLint rules, including ECMAScript 6+ and is similar to [Airbnb's ESLint base rules](https://github.com/airbnb/javascript/tree/master/packages/eslint-config-airbnb-base). It requires `eslint` and `eslint-plugin-import`.
+## Usage
 
-<h2 align="center">eslint setup</h2>
+Webpack's eslint config contains all of our ESLint rules.
 
-_In your .eslintrc.js || .yml || .json add ..._
+_In your eslint.config.js add ..._
 
 ```js
-// Add to your .eslintrc
-
-"extends": "webpack"
+import { defineConfig } from "eslint/config";
+import config from "eslint-config-webpack";
+
+export default defineConfig([
+	{
+		extends: [config]
+	}
+]);
 ```
 
-<h2 align="center">Maintainers</h2>
-
-<table>
-  <tbody>
-    <tr>
-      <td align="center">
-        <img width="150" height="150"
-        src="https://avatars2.githubusercontent.com/u/8420490?v=3&s=150">
-        </br>
-        <a href="https://github.com/d3viant0ne">Joshua Wiens</a>
-      </td>
-      <td align="center">
-        <img width="150" height="150"
-        src="https://avatars3.githubusercontent.com/u/166921?v=3&s=150">
-        </br>
-        <a href="https://github.com/bebraw">Juho Vepsäläinen</a>
-      </td>
-    </tr>
-  <tbody>
-</table>
-
-
-[npm]: https://img.shields.io/npm/v/@webpack-contrib/eslint-config-webpack.svg
-[npm-url]: https://npmjs.com/package/@webpack-contrib/eslint-config-webpack
-
-[chat]: https://img.shields.io/badge/gitter-webpack%2Fwebpack-brightgreen.svg
-[chat-url]: https://gitter.im/webpack/webpack
-
-[test]: http://img.shields.io/travis/webpack-contrib/eslint-config-webpack.svg
-[test-url]: https://travis-ci.org/webpack-contrib/eslint-config-webpack
-
-[cover]: https://coveralls.io/repos/github/webpack-contrib/eslint-config-webpack/badge.svg?branch=master
-[cover-url]: https://coveralls.io/github/webpack-contrib/eslint-config-webpack?branch=master
+[npm]: https://img.shields.io/npm/v/eslint-config-webpack.svg
+[npm-url]: https://npmjs.com/package/eslint-config-webpack
+[test]: https://github.com/webpack-contrib/eslint-config-webpack/actions/workflows/test.yml/badge.svg
+[test-url]: https://github.com/webpack-contrib/eslint-config-webpack/actions/workflows/test.yml

configs.js

@@ -0,0 +1,208 @@
+import fs from "node:fs";
+import path from "node:path";
+// eslint-disable-next-line import/no-unresolved
+import { globalIgnores } from "eslint/config";
+import semver from "semver";
+import configs from "./configs/index.js";
+import ignorePaths from "./ignore-paths.js";
+
+const SKIP_TIME = 5000;
+
+class Cache {
+	/**
+	 * Initialize this cache instance.
+	 */
+	constructor() {
+		this.map = new Map();
+	}
+
+	/**
+	 * Get the cached value of the given key.
+	 * @param {string} key The key to get.
+	 * @returns {import('type-fest').JsonObject} The cached value or null.
+	 */
+	get(key) {
+		const entry = this.map.get(key);
+		const now = Date.now();
+
+		if (entry) {
+			if (entry.expire > now) {
+				entry.expire = now + SKIP_TIME;
+				return entry.value;
+			}
+			this.map.delete(key);
+		}
+		return null;
+	}
+
+	/**
+	 * Set the value of the given key.
+	 * @param {string} key The key to set.
+	 * @param {import('type-fest').JsonObject} value The value to set.
+	 * @returns {void}
+	 */
+	set(key, value) {
+		const entry = this.map.get(key);
+		const expire = Date.now() + SKIP_TIME;
+
+		if (entry) {
+			entry.value = value;
+			entry.expire = expire;
+		} else {
+			this.map.set(key, { value, expire });
+		}
+	}
+}
+
+const cache = new Cache();
+
+/**
+ * Reads the `package.json` data in a given path.
+ *
+ * Don't cache the data.
+ * @param {string} dir The path to a directory to read.
+ * @returns {import('type-fest').JsonObject|null} The read `package.json` data, or null.
+ */
+function readPackageJson(dir) {
+	const filePath = path.join(dir, "package.json");
+	try {
+		const text = fs.readFileSync(filePath, "utf8");
+		const data = JSON.parse(text);
+
+		if (
+			data !== null &&
+			typeof data === "object" &&
+			Array.isArray(data) === false
+		) {
+			data.filePath = filePath;
+			return data;
+		}
+		// eslint-disable-next-line unicorn/prefer-optional-catch-binding
+	} catch (_err) {
+		// do nothing.
+	}
+
+	return null;
+}
+
+/**
+ * Gets a `package.json` data.
+ * The data is cached if found, then it's used after.
+ * @param {string=} startPath A file path to lookup.
+ * @returns {import('type-fest').JsonObject | null} A found `package.json` data or `null`.
+ * This object have additional property `filePath`.
+ */
+function getPackageJson(startPath = "a.js") {
+	const startDir = path.dirname(path.resolve(startPath));
+	let dir = startDir;
+	let prevDir = "";
+	let data = null;
+
+	do {
+		data = cache.get(dir);
+		if (data) {
+			if (dir !== startDir) {
+				cache.set(startDir, data);
+			}
+			return data;
+		}
+
+		data = readPackageJson(dir);
+		if (data) {
+			cache.set(dir, data);
+			cache.set(startDir, data);
+			return data;
+		}
+
+		// Go to next.
+		prevDir = dir;
+		dir = path.resolve(dir, "..");
+	} while (dir !== prevDir);
+
+	cache.set(startDir, null);
+	return null;
+}
+
+const packageJson = getPackageJson();
+const isModule =
+	packageJson !== null &&
+	typeof packageJson === "object" &&
+	"type" in packageJson &&
+	packageJson.type === "module";
+
+/**
+ * @returns {Record<string, string>} javascript configuration
+ */
+function getJavascriptConfig() {
+	if (packageJson.engines && packageJson.engines.node) {
+		const minVersion = semver.minVersion(packageJson.engines.node).major;
+
+		// https://node.green/
+		switch (minVersion) {
+			case 8:
+			case 9:
+				return configs["javascript/es2017"];
+			case 10:
+			case 11:
+				return configs["javascript/es2018"];
+			case 12:
+			case 13: {
+				const languageOptions = {
+					...configs["javascript/es2019"].languageOptions,
+				};
+
+				languageOptions.globals.Promise = false;
+				languageOptions.globals.BigInt = false;
+
+				return { ...configs["javascript/es2019"], languageOptions };
+			}
+			case 14:
+				return configs["javascript/es2020"];
+
+			case 15:
+				return configs["javascript/es2021"];
+			case 16:
+			case 17:
+			case 18:
+			case 19:
+				return configs["javascript/es2022"];
+			case 20:
+			case 21:
+				return configs["javascript/es2023"];
+			case 22:
+			case 23:
+				return configs["javascript/es2024"];
+			case 24:
+			case 25:
+				return configs["javascript/es2025"];
+			default:
+				return configs["javascript/recommended"];
+		}
+	}
+
+	return configs["javascript/recommended"];
+}
+
+configs.recommended = [
+	globalIgnores(ignorePaths),
+	isModule
+		? configs["node/mixed-module-and-commonjs"]
+		: configs["node/mixed-commonjs-and-module"],
+	getJavascriptConfig(),
+	configs["typescript/jsdoc"],
+	configs["jest/recommended"],
+	configs["markdown/recommended"],
+	configs["stylistic/recommended"],
+];
+
+configs["recommended-dirty"] = [
+	globalIgnores(ignorePaths),
+	configs["node/mixed-dirty"],
+	getJavascriptConfig(),
+	configs["typescript/jsdoc"],
+	configs["jest/recommended"],
+	configs["markdown/recommended"],
+	configs["stylistic/recommended"],
+];
+
+export { default } from "./configs/index.js";

configs/browser.js

@@ -0,0 +1,13 @@
+import globals from "globals";
+
+const recommendedBrowserConfig = {
+	languageOptions: {
+		globals: {
+			...globals.browser,
+		}
+	},
+};
+
+export default {
+	"browser/recommended": recommendedBrowserConfig,
+};