[New] add eslint 9 support

This change adds support for eslint v9. All three example projects have been updated to use the latest eslint, and the root package's dev and peer deps have been updated.

In order to make this work with both v9 and older versions, I had to update the parser options helper to adjust the config passed into the `RuleTester`.

.flowconfig

@@ -3,5 +3,6 @@
 <PROJECT_ROOT>/lib/.*
 <PROJECT_ROOT>/docs/.*
 <PROJECT_ROOT>/reports/.*
+<PROJECT_ROOT>/examples/.*
 [options]
 suppress_type=$FlowFixMe

.github/workflows/node-4+.yml

@@ -25,13 +25,40 @@ jobs:
  matrix:
  node-version: ${{ fromJson(needs.matrix.outputs.latest) }}
  eslint:
+ - 9
  - 8
  - 7
  - 6
  - 5
  - 4
  - 3
  exclude:
+ - node-version: 16
+ eslint: 9
+ - node-version: 15
+ eslint: 9
+ - node-version: 14
+ eslint: 9
+ - node-version: 13
+ eslint: 9
+ - node-version: 12
+ eslint: 9
+ - node-version: 11
+ eslint: 9
+ - node-version: 10
+ eslint: 9
+ - node-version: 9
+ eslint: 9
+ - node-version: 8
+ eslint: 9
+ - node-version: 7
+ eslint: 9
+ - node-version: 6
+ eslint: 9
+ - node-version: 5
+ eslint: 9
+ - node-version: 4
+ eslint: 9
  - node-version: 15
  eslint: 8
  - node-version: 13
@@ -90,7 +117,7 @@ jobs:
  steps:
  - uses: actions/checkout@v4
  with:
-  fetch-depth: 0
+ fetch-depth: 0
  - uses: ljharb/actions/node/install@main
  name: 'nvm install ${{ matrix.node-version }} && npm install'
  env:

__tests__/__util__/nodeReexports/assert.js

@@ -0,0 +1,3 @@
+import assert from 'assert';
+
+export default assert;

__tests__/__util__/nodeReexports/fs-promises.js

@@ -0,0 +1,3 @@
+import fs from 'fs/promises';
+
+export default fs;

__tests__/__util__/nodeReexports/fs.js

@@ -0,0 +1,3 @@
+import fs from 'fs';
+
+export default fs;

__tests__/__util__/nodeReexports/path.js

@@ -0,0 +1,3 @@
+import path from 'path';
+
+export default path;

__tests__/__util__/nodeReexports/url.js

@@ -0,0 +1,3 @@
+import url from 'url';
+
+export default url;

__tests__/__util__/nodeReexports/util.js

@@ -0,0 +1,3 @@
+import util from 'util';
+
+export default util;

__tests__/__util__/parserOptionsMapper.js

@@ -1,26 +1,53 @@
+import { version as eslintVersion } from 'eslint/package.json';
+import semver from 'semver';
+
+const usingLegacy = semver.major(eslintVersion) < 9;
+
 const defaultParserOptions = {
- ecmaVersion: 2018,
  ecmaFeatures: {
  experimentalObjectRestSpread: true,
  jsx: true,
  },
 };
 
+const defaultLegacyParserOptions = {
+ ...defaultParserOptions,
+ ecmaVersion: 2018,
+};
+
+const defaultLanguageOptions = {
+ ecmaVersion: 'latest',
+ parserOptions: {
+ ...defaultParserOptions,
+ },
+};
+
 export default function parserOptionsMapper({
  code,
  errors,
  options = [],
- parserOptions = {},
- settings,
+ languageOptions = {},
+ settings = {},
 }) {
- return {
- code,
- errors,
- options,
- parserOptions: {
- ...defaultParserOptions,
- ...parserOptions,
- },
- settings,
- };
+ return usingLegacy
+ ? {
+ code,
+ errors,
+ options,
+ parserOptions: {
+ ...defaultLegacyParserOptions,
+ ...languageOptions,
+ },
+ settings,
+ }
+ : {
+ code,
+ errors,
+ options,
+ languageOptions: {
+ ...defaultLanguageOptions,
+ ...languageOptions,
+ },
+ settings,
+ };
 }

__tests__/src/rules/img-redundant-alt-test.js

@@ -67,8 +67,8 @@ ruleTester.run('img-redundant-alt', rule, {
  { code: '<img alt={imageAlt} />' },
  { code: '<img alt={imageAlt.name} />' },
  semver.satisfies(eslintVersion, '>= 6') ? [
- { code: '<img alt={imageAlt?.name} />', parserOptions: { ecmaVersion: 2020 } },
- { code: '<img alt="Doing cool things" aria-hidden={foo?.bar}/>', parserOptions: { ecmaVersion: 2020 } },
+ { code: '<img alt={imageAlt?.name} />', languageOptions: { ecmaVersion: 2020 } },
+ { code: '<img alt="Doing cool things" aria-hidden={foo?.bar}/>', languageOptions: { ecmaVersion: 2020 } },
  ] : [],
  { code: '<img alt="Photography" />;' },
  { code: '<img alt="ImageMagick" />;' },

__tests__/src/util/parserOptionsMapper-test.js

@@ -1,46 +1,88 @@
+import { version as eslintVersion } from 'eslint/package.json';
 import expect from 'expect';
+import semver from 'semver';
 import parserOptionsMapper from '../../__util__/parserOptionsMapper';
 
+const usingLegacy = semver.major(eslintVersion) < 9;
+
 describe('parserOptionsMapper', () => {
  it('should return an test case object', () => {
  const testCase = {
  code: '<div />',
  errors: [],
  options: {},
  };
- expect(parserOptionsMapper(testCase)).toEqual({
- code: '<div />',
- errors: [],
- options: {},
- parserOptions: {
- ecmaVersion: 2018,
- ecmaFeatures: {
- experimentalObjectRestSpread: true,
- jsx: true,
+
+ const expectedResult = usingLegacy
+ ? {
+ code: '<div />',
+ errors: [],
+ options: {},
+ parserOptions: {
+ ecmaVersion: 2018,
+ ecmaFeatures: {
+ experimentalObjectRestSpread: true,
+ jsx: true,
+ },
  },
- },
- });
+ settings: {},
+ }
+ : {
+ code: '<div />',
+ errors: [],
+ options: {},
+ languageOptions: {
+ ecmaVersion: 'latest',
+ parserOptions: {
+ ecmaFeatures: {
+ experimentalObjectRestSpread: true,
+ jsx: true,
+ },
+ },
+ },
+ settings: {},
+ };
+ expect(parserOptionsMapper(testCase)).toEqual(expectedResult);
  });
  it('should allow for overriding parserOptions', () => {
  const testCase = {
  code: '<div />',
  errors: [],
  options: {},
- parserOptions: {
+ languageOptions: {
  ecmaVersion: 5,
  },
  };
- expect(parserOptionsMapper(testCase)).toEqual({
- code: '<div />',
- errors: [],
- options: {},
- parserOptions: {
- ecmaVersion: 5,
- ecmaFeatures: {
- experimentalObjectRestSpread: true,
- jsx: true,
+
+ const expectedResult = usingLegacy
+ ? {
+ code: '<div />',
+ errors: [],
+ options: {},
+ parserOptions: {
+ ecmaVersion: 5,
+ ecmaFeatures: {
+ experimentalObjectRestSpread: true,
+ jsx: true,
+ },
  },
- },
- });
+ settings: {},
+ }
+ : {
+ code: '<div />',
+ errors: [],
+ options: {},
+ languageOptions: {
+ ecmaVersion: 5,
+ parserOptions: {
+ ecmaFeatures: {
+ experimentalObjectRestSpread: true,
+ jsx: true,
+ },
+ },
+ },
+ settings: {},
+ };
+ expect(parserOptionsMapper(testCase)).toEqual(expectedResult);
  });
 });

examples/flat-cjs/package.json

@@ -11,9 +11,9 @@
  "react-dom": "^18.2.0"
  },
  "devDependencies": {
- "@eslint/js": "^9.5.0",
+ "@eslint/js": "^9.9.1",
  "cross-env": "^7.0.3",
- "eslint": "^8.57.0",
+ "eslint": "^9.9.1",
  "eslint-plugin-jsx-a11y": "file:../..",
  "globals": "^15.6.0"
  }

examples/flat-esm/package.json

@@ -11,9 +11,9 @@
  "react-dom": "^18.2.0"
  },
  "devDependencies": {
- "@eslint/js": "^9.5.0",
+ "@eslint/js": "^9.9.1",
  "cross-env": "^7.0.3",
- "eslint": "^8.57.0",
+ "eslint": "^9.9.1",
  "eslint-plugin-jsx-a11y": "file:../..",
  "globals": "^15.6.0"
  }

examples/legacy/package.json

@@ -12,7 +12,7 @@
  },
  "devDependencies": {
  "cross-env": "^7.0.3",
- "eslint": "^8.57.0",
+ "eslint": "^9.9.1",
  "eslint-plugin-jsx-a11y": "file:../.."
  }
 }

package.json

@@ -22,7 +22,7 @@
  "create": "node ./scripts/create-rule",
  "flow": "flow",
  "lint:fix": "npm run lint -- --fix",
- "lint": "eslint --ext=js,mjs,cjs,ts,tsx .",
+ "lint": "npx eslint@8 --ext=js,mjs,cjs,ts,tsx .",
  "prepublish": "not-in-publish || npm run prepublishOnly",
  "prepublishOnly": "safe-publish-latest && npm run lint && npm run flow && npm run jest",
  "pretest": "npm run lint:fix && npm run flow",
@@ -34,7 +34,7 @@
  "test-example:legacy": "cd examples/legacy && npm install && npm run lint",
  "test-example:flat-esm": "cd examples/flat-esm && npm install && npm run lint",
  "test-example:flat-cjs": "cd examples/flat-cjs && npm install && npm run lint",
- "jest": "jest --coverage __tests__/**/*",
+ "jest": "jest --coverage __tests__",
  "pregenerate-list-of-rules": "npm run build",
  "generate-list-of-rules": "eslint-doc-generator --rule-doc-title-format prefix-name --rule-doc-section-options false --config-emoji recommended,☑️ --ignore-config flat/recommended --ignore-config flat/strict",
  "generate-list-of-rules:check": "npm run generate-list-of-rules -- --check",
@@ -51,7 +51,8 @@
  "babel-jest": "^24.9.0",
  "babel-plugin-add-module-exports": "^1.0.4",
  "babel-preset-airbnb": "^5.0.0",
- "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8",
+ "core-js": "^3.38.1",
+ "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9",
  "eslint-config-airbnb-base": "^15.0.0",
  "eslint-doc-generator": "^1.7.1",
  "eslint-plugin-eslint-plugin": "^4.3.0",
@@ -96,7 +97,7 @@
  "string.prototype.includes": "^2.0.0"
  },
  "peerDependencies": {
- "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8"
+ "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8 || ^9"
  },
  "jest": {
  "coverageReporters": [
@@ -111,7 +112,18 @@
  "testPathIgnorePatterns": [
  "__tests__/__util__/"
  ],
- "testEnvironment": "node"
+ "testEnvironment": "node",
+ "moduleNameMapper": {
+ "@eslint/config-array": "<rootDir>/node_modules/@eslint/config-array/dist/cjs/index.cjs",
+ "@eslint/object-schema": "<rootDir>/node_modules/@eslint/object-schema/dist/cjs/index.cjs",
+ "node:assert": "<rootDir>/__tests__/__util__/nodeReexports/assert.js",
+ "node:fs/promises": "<rootDir>/__tests__/__util__/nodeReexports/fs-promises.js",
+ "node:fs": "<rootDir>/__tests__/__util__/nodeReexports/fs.js",
+ "node:path": "<rootDir>/__tests__/__util__/nodeReexports/path.js",
+ "node:url": "<rootDir>/__tests__/__util__/nodeReexports/url.js",
+ "node:util": "<rootDir>/__tests__/__util__/nodeReexports/util.js"
+ },
+ "setupFilesAfterEnv": ["<rootDir>/setup.jest.js"]
  },
  "auto-changelog": {
  "output": "CHANGELOG.md",
@@ -132,7 +144,8 @@
  "/flow",
  "scripts/",
  "CONTRIBUTING.md",
- "/examples"
+ "/examples",
+ "setup.jest.js"
  ]
  }
 }

setup.jest.js

@@ -0,0 +1,2 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import 'core-js/stable/structured-clone';