feat!: requires node >= 18 & eslint >= 8.23.0 (#456)

* feat!: required node >= 18 & eslint >= 8.23.0

* chore: switch to eslint flat-rule-tester

* build: split eslint-rule-tester

* build: fix npm install

* fix: npm scripts order

* fix: revert unexpected tests changes

* fix: npm scripts order

* chore: eslint-plugin-n v17.0.0

.github/workflows/main.yml

@@ -12,18 +12,17 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
+          - 21
           - 20
           - 18
-          - 16
-          - 14
         os:
           - ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - run: npm install
+      - run: npm install --force # ts-eslint does not support eslint v9 yet.
       - run: npm test
 
   lint:
@@ -32,18 +31,29 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
-      - run: npm install
+          node-version: "lts/*"
+      - run: npm install --force # ts-eslint does not support eslint v9 yet.
       - run: npm run lint
 
-  eslint7:
+  eslint8:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-node@v4
       with:
-        node-version: "18.x"
-    - run: npm install
-    - run: npm install --save-dev eslint@7
+        node-version: "lts/*"
+    - run: npm install --force # ts-eslint does not support eslint v9 yet.
+    - run: npm install --save-dev eslint@8
     - run: npm test
 
+  test-remote:
+    name: eslint-remote-tester
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "lts/*"
+      - run: npm install --force # ts-eslint does not support eslint v9 yet.
+      - run: npm install --save-dev eslint@8 # eslint-remote-tester does not support eslint v9.
+      - run: npm run test:remote

lib/rules/no-unused-placeholders.js

@@ -101,9 +101,12 @@ module.exports = {
               const PLACEHOLDER_MATCHER = /{{\s*([^{}]+?)\s*}}/g;
               const placeholdersInMessage = new Set();
 
-              messageValue.replace(PLACEHOLDER_MATCHER, (fullMatch, term) => {
-                placeholdersInMessage.add(term);
-              });
+              messageValue.replaceAll(
+                PLACEHOLDER_MATCHER,
+                (fullMatch, term) => {
+                  placeholdersInMessage.add(term);
+                }
+              );
 
               data.properties.forEach((prop) => {
                 const key = utils.getKeyName(prop);

lib/rules/require-meta-docs-url.js

@@ -62,7 +62,7 @@ module.exports = {
     const expectedUrl =
       !options.pattern || !ruleName
         ? undefined
-        : options.pattern.replace(/{{\s*name\s*}}/g, ruleName);
+        : options.pattern.replaceAll(/{{\s*name\s*}}/g, ruleName);
 
     /**
      * Check whether a given URL is the expected URL.

lib/utils.js

@@ -719,7 +719,7 @@ module.exports = {
       return fixer.replaceText(node, `{\n${propertyText}\n}`);
     }
     return fixer.insertTextAfter(
-      sourceCode.getLastToken(node.properties[node.properties.length - 1]),
+      sourceCode.getLastToken(node.properties.at(-1)),
       `,\n${propertyText}`
     );
   },

package.json

@@ -17,9 +17,9 @@
     "lint:js": "eslint --cache --ignore-pattern \"**/*.md\" .",
     "lint:js-docs": "eslint --no-inline-config \"**/*.md\"",
     "lint:package-json": "npmPkgJsonLint .",
-    "lint:remote": "eslint-remote-tester",
     "release": "release-it",
     "test": "nyc --all --check-coverage --include lib mocha tests --recursive",
+    "test:remote": "eslint-remote-tester",
     "update:eslint-docs": "eslint-doc-generator"
   },
   "files": [
@@ -52,29 +52,29 @@
   "devDependencies": {
     "@commitlint/cli": "^17.1.2",
     "@commitlint/config-conventional": "^17.1.0",
-    "@eslint/eslintrc": "^2.0.2",
-    "@eslint/js": "^8.57.0",
+    "@eslint/eslintrc": "^3.0.2",
+    "@eslint/js": "^9.0.0",
     "@release-it/conventional-changelog": "^4.3.0",
-    "@types/eslint": "^8.56.6",
+    "@types/eslint": "^8.56.7",
     "@types/estree": "^1.0.5",
-    "@typescript-eslint/parser": "^5.62.0",
-    "@typescript-eslint/utils": "^5.62.0",
+    "@typescript-eslint/parser": "^7.5.0",
+    "@typescript-eslint/utils": "^7.5.0",
     "chai": "^4.3.6",
     "dirty-chai": "^2.0.1",
-    "eslint": "^8.57.0",
+    "eslint": "^9.0.0",
     "eslint-config-not-an-aardvark": "^2.1.0",
     "eslint-config-prettier": "^8.5.0",
     "eslint-doc-generator": "^1.7.0",
     "eslint-plugin-eslint-comments": "^3.2.0",
     "eslint-plugin-eslint-plugin": "file:./",
     "eslint-plugin-markdown": "^3.0.0",
-    "eslint-plugin-n": "^16.6.2",
+    "eslint-plugin-n": "^17.0.0",
     "eslint-plugin-prettier": "^4.2.1",
-    "eslint-plugin-unicorn": "^46.0.0",
+    "eslint-plugin-unicorn": "^52.0.0",
     "eslint-remote-tester": "^3.0.1",
-    "eslint-scope": "^7.1.1",
-    "espree": "^9.4.0",
-    "globals": "^13.20.0",
+    "eslint-scope": "^8.0.1",
+    "espree": "^10.0.1",
+    "globals": "^15.0.0",
     "husky": "^8.0.1",
     "lodash": "^4.17.21",
     "markdownlint-cli": "^0.39.0",
@@ -87,10 +87,10 @@
     "typescript": "^5.4.3"
   },
   "peerDependencies": {
-    "eslint": ">=7.0.0"
+    "eslint": ">=8.23.0"
   },
   "engines": {
-    "node": "^14.17.0 || ^16.0.0 || >= 18.0.0"
+    "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
   },
   "release-it": {
     "git": {

tests/lib/eslint-rule-tester.js

@@ -0,0 +1,15 @@
+/**
+ * @fileoverview Helpers for tests.
+ * @author 唯然<[email protected]>
+ */
+
+'use strict';
+
+const eslintVersion = require('eslint/package.json').version;
+const { RuleTester } = require('eslint');
+const { FlatRuleTester } = require('eslint/use-at-your-own-risk');
+
+// greater than or equal to ESLint v9
+exports.gteEslintV9 = +eslintVersion.split('.')[0] >= 9;
+
+exports.RuleTester = exports.gteEslintV9 ? RuleTester : FlatRuleTester;

tests/lib/rules/consistent-output.js

@@ -10,15 +10,17 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/consistent-output');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 const ERROR = { messageId: 'missingOutput', type: 'ObjectExpression' };
 
 // ------------------------------------------------------------------------------
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester();
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 ruleTester.run('consistent-output', rule, {
   valid: [
     `

tests/lib/rules/fixer-return.js

@@ -10,13 +10,15 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/fixer-return');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 ruleTester.run('fixer-return', rule, {
   valid: [
     `

tests/lib/rules/meta-property-ordering.js

@@ -9,13 +9,15 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/meta-property-ordering');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 ruleTester.run('test-case-property-ordering', rule, {
   valid: [
     `
@@ -31,7 +33,7 @@ ruleTester.run('test-case-property-ordering', rule, {
           meta: {type, docs, fixable, schema, messages},
           create() {},
         };`,
-      parserOptions: { sourceType: 'module' },
+      languageOptions: { sourceType: 'module' },
     },
 
     `
@@ -124,13 +126,13 @@ ruleTester.run('test-case-property-ordering', rule, {
           },
           create() {},
         };`,
-      parserOptions: { sourceType: 'module' },
       errors: [
         {
           messageId: 'inconsistentOrder',
           data: { order: ['type', 'docs', 'fixable'].join(', ') },
         },
       ],
+      languageOptions: { sourceType: 'module' },
     },
     {
       code: `

tests/lib/rules/no-deprecated-context-methods.js

@@ -10,13 +10,15 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-deprecated-context-methods');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 ruleTester.run('no-deprecated-context-methods', rule, {
   valid: [
     `

tests/lib/rules/no-deprecated-report-api.js

@@ -10,13 +10,15 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-deprecated-report-api');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 ruleTester.run('no-deprecated-report-api', rule, {
   valid: [
     `

tests/lib/rules/no-identical-tests.js

@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-identical-tests');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 const ERROR_OBJECT_TEST = { messageId: 'identical', type: 'ObjectExpression' };
 const ERROR_STRING_TEST = { messageId: 'identical', type: 'Literal' };
@@ -19,7 +19,9 @@ const ERROR_STRING_TEST = { messageId: 'identical', type: 'Literal' };
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester();
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 ruleTester.run('no-identical-tests', rule, {
   valid: [
     `
@@ -232,8 +234,8 @@ ruleTester.run('no-identical-tests', rule, {
           });
         }
       `,
-      parserOptions: { ecmaVersion: 2015 },
       errors: [{ messageId: 'identical', type: 'TemplateLiteral' }],
+      languageOptions: { ecmaVersion: 2015 },
     },
   ],
 });

tests/lib/rules/no-missing-message-ids.js

@@ -5,13 +5,15 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-missing-message-ids');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 // ------------------------------------------------------------------------------
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 9 } });
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 
 ruleTester.run('no-missing-message-ids', rule, {
   valid: [
@@ -75,7 +77,7 @@ ruleTester.run('no-missing-message-ids', rule, {
           }
         };
       `,
-      parserOptions: { sourceType: 'module' },
+      languageOptions: { sourceType: 'module' },
     },
     // unrelated function 1
     `
@@ -321,14 +323,14 @@ ruleTester.run('no-missing-message-ids', rule, {
           }
         };
       `,
-      parserOptions: { sourceType: 'module' },
       errors: [
         {
           messageId: 'missingMessage',
           data: { messageId: 'foo' },
           type: 'Literal',
         },
       ],
+      languageOptions: { sourceType: 'module' },
     },
     {
       // Helper function with messageId parameter, inside rule, with missing messageId due to parameter reassignment.

tests/lib/rules/no-missing-placeholders.js

@@ -10,7 +10,7 @@
 // ------------------------------------------------------------------------------
 
 const rule = require('../../../lib/rules/no-missing-placeholders');
-const RuleTester = require('eslint').RuleTester;
+const RuleTester = require('../eslint-rule-tester').RuleTester;
 
 /**
  * Create an error for the given key
@@ -29,7 +29,9 @@ function error(missingKey, type, extra) {
 // Tests
 // ------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+const ruleTester = new RuleTester({
+  languageOptions: { sourceType: 'commonjs' },
+});
 ruleTester.run('no-missing-placeholders', rule, {
   valid: [
     `