feat!: drop eslint v7 & node.js < 18

.github/workflows/CI.yml

@@ -35,25 +35,19 @@ jobs:
         node: [18.x, 20.x]
         include:
           - os: ubuntu-latest
-            node: "16.0.x"
-            eslint: "8.x"
-          - os: ubuntu-latest
-            node: "16.x"
-            eslint: "8.x"
-          - os: ubuntu-latest
-            node: "19.x"
+            node: "21.x"
             eslint: "8.x"
           - os: ubuntu-latest
             node: "20.x"
-            eslint: "7.0.x"
+            eslint: "9.0.0-alpha.0"
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
         with:
           fetch-depth: 1
       - name: Install Node.js ${{ matrix.node }}
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node }}
       - name: Install Packages

README.md

@@ -18,8 +18,11 @@ Additional ESLint rules for Node.js
 npm install --save-dev eslint eslint-plugin-n
 ```
 
-- Requires Node.js `>=16.0.0`
-- Requires ESLint `>=7.0.0`
+| Version | Supported Node.js | Supported ESLint Version |
+|---------|-------------------|---------------------------|
+| 17.x   | `Node.js:^18.18.0 \|\| ^20.9.0 \|\| >=21.1.0`  | `ESLint>=8.23.0`          |
+| 16.x   | `Node.js>=16.0.0`   | `ESLint>=7.0.0`          |
+| 15.x   | `Node.js>=12.22.0`  | `ESLint>=7.0.0`          |
 
 **Note:** It recommends a use of [the "engines" field of package.json](https://docs.npmjs.com/files/package.json#engines). The "engines" field is used by `n/no-unsupported-features/*` rules.
 

eslint.config.js

@@ -13,6 +13,9 @@ module.exports = [
     {
         languageOptions: { globals: globals.mocha },
         linterOptions: { reportUnusedDisableDirectives: true },
+        settings: {
+            n: { allowModules: ["#eslint-rule-tester"] }, // the plugin does not support import-maps yet.
+        },
     },
     {
         ignores: [
@@ -27,7 +30,9 @@ module.exports = [
     nodeRecommended,
     eslintPluginConfig,
     prettierConfig,
-    { rules: { "eslint-plugin/require-meta-docs-description": "error" } },
+    {
+        rules: { "eslint-plugin/require-meta-docs-description": "error" },
+    },
     {
         // these messageIds were used outside
         files: ["lib/rules/prefer-global/*.js"],

package.json

@@ -3,15 +3,15 @@
     "version": "16.6.1",
     "description": "Additional ESLint's rules for Node.js",
     "engines": {
-        "node": ">=16.0.0"
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
     },
     "main": "lib/index.js",
     "files": [
         "lib/",
         "configs/"
     ],
     "peerDependencies": {
-        "eslint": ">=7.0.0"
+        "eslint": ">=8.23.0"
     },
     "dependencies": {
         "@eslint-community/eslint-utils": "^4.4.0",
@@ -31,7 +31,7 @@
         "@types/eslint": "^8.44.6",
         "@typescript-eslint/parser": "^5.60.0",
         "esbuild": "^0.18.7",
-        "eslint": "^8.56.0",
+        "eslint": "^8",
         "eslint-config-prettier": "^8.8.0",
         "eslint-doc-generator": "^1.6.1",
         "eslint-plugin-eslint-plugin": "^5.2.1",
@@ -111,5 +111,8 @@
     "lint-staged": {
         "*.js": "eslint --cache --fix",
         "*.{json,js}": "prettier --write --ignore-path .eslintignore"
+    },
+    "imports": {
+        "#eslint-rule-tester": "./tests/eslint-rule-tester.js"
     }
 }

tests/eslint-rule-tester.js

@@ -0,0 +1,41 @@
+/**
+ * @fileoverview Helpers for tests.
+ * @author 唯然<[email protected]>
+ */
+"use strict"
+const eslintVersion = require("eslint/package.json").version
+const RuleTester = require("eslint").RuleTester
+const unofficialApis = require("eslint/use-at-your-own-risk")
+const globals = require("globals")
+
+// greater than or equal to ESLint v9
+exports.gteEslintV9 = +eslintVersion.split(".")[0] >= 9
+
+exports.FlatRuleTester = exports.gteEslintV9
+    ? RuleTester
+    : unofficialApis.FlatRuleTester
+
+// to support the `env:{ es6: true, node: true}` rule-tester (env has been away in flat config.)
+// * enabled by default as it's most commonly used in the package.
+// * to disable the node.js globals: {languageOptions: {env: {node: false}}}.
+const defaultConfig = {
+    languageOptions: {
+        ecmaVersion: 6,
+        sourceType: "commonjs",
+        globals: globals.node,
+    },
+}
+exports.RuleTester = function (config = defaultConfig) {
+    if (config.languageOptions.env?.node === false)
+        config.languageOptions.globals = config.languageOptions.globals || {}
+    delete config.languageOptions.env
+
+    config.languageOptions = Object.assign(
+        {},
+        defaultConfig.languageOptions,
+        config.languageOptions
+    )
+
+    const ruleTester = new exports.FlatRuleTester(config)
+    return ruleTester
+}

tests/lib/configs/recommended.js → tests/lib/configs/eslintrc.js

@@ -2,9 +2,9 @@
 
 const assert = require("assert")
 const path = require("path")
-const { ESLint } = require("eslint")
+const { LegacyESLint } = require("eslint/use-at-your-own-risk")
+// const {ESLint} = require("eslint")
 const { gtEslintV8 } = require("../../helpers")
-
 const originalCwd = process.cwd()
 
 // this is needed as `recommended` config was cached
@@ -24,7 +24,7 @@ describe("node/recommended config", () => {
         beforeEach(() => {
             process.chdir(root)
             clearRequireCache()
-            linter = new ESLint({
+            linter = new LegacyESLint({
                 baseConfig: { extends: "plugin:n/recommended" },
                 useEslintrc: false,
             })
@@ -102,7 +102,7 @@ describe("node/recommended config", () => {
         beforeEach(() => {
             process.chdir(root)
             clearRequireCache()
-            linter = new ESLint({
+            linter = new LegacyESLint({
                 baseConfig: { extends: "plugin:n/recommended" },
                 useEslintrc: false,
             })

tests/lib/rules/callback-return.js

@@ -4,9 +4,9 @@
  */
 "use strict"
 
-const RuleTester = require("eslint").RuleTester
+const RuleTester = require("#eslint-rule-tester").RuleTester
 const rule = require("../../../lib/rules/callback-return")
-const ruleTester = new RuleTester({ env: { node: true, es6: true } })
+const ruleTester = new RuleTester()
 
 ruleTester.run("callback-return", rule, {
     valid: [