feat: support ESLint 8.x

.github/workflows/node-4+.yml

@@ -26,6 +26,7 @@ jobs:
       matrix:
         node-version: ${{ fromJson(needs.matrix.outputs.latest) }}
         eslint:
+          - '^8.0.0-0'
           - 7
           - 6
           - 5
@@ -43,24 +44,46 @@ jobs:
             babel-eslint: 10
           - node-version: 4
             babel-eslint: 9
+          - node-version: 15
+            eslint: '^8.0.0-0'
+          - node-version: 13
+            eslint: '^8.0.0-0'
+          - node-version: 11
+            eslint: '^8.0.0-0'
+          - node-version: 11
+            eslint: 7
+          - node-version: 10
+            eslint: '^8.0.0-0'
+          - node-version: 9
+            eslint: '^8.0.0-0'
           - node-version: 9
             eslint: 7
+          - node-version: 8
+            eslint: '^8.0.0-0'
           - node-version: 8
             eslint: 7
+          - node-version: 7
+            eslint: '^8.0.0-0'
           - node-version: 7
             eslint: 7
           - node-version: 7
             eslint: 6
+          - node-version: 6
+            eslint: '^8.0.0-0'
           - node-version: 6
             eslint: 7
           - node-version: 6
             eslint: 6
+          - node-version: 5
+            eslint: '^8.0.0-0'
           - node-version: 5
             eslint: 7
           - node-version: 5
             eslint: 6
           - node-version: 5
             eslint: 5
+          - node-version: 4
+            eslint: '^8.0.0-0'
           - node-version: 4
             eslint: 7
           - node-version: 4
@@ -74,7 +97,7 @@ jobs:
         name: 'nvm install ${{ matrix.node-version }} && npm install'
         with:
           node-version: ${{ matrix.node-version }}
-          after_install: npm install --no-save "eslint@${{ matrix.eslint }}" "@typescript-eslint/parser@${{ matrix.node-version >= 10 && '4.0' || (matrix.node-version >= 8 && '3' || '2') }}" "babel-eslint@${{ matrix.babel-eslint }}"
+          after_install: npm install --no-save "eslint@${{ matrix.eslint }}" "@typescript-eslint/parser@${{ matrix.node-version >= 10 && '^5.0.0-0' || (matrix.node-version >= 8 && '3' || '2') }}" "babel-eslint@${{ matrix.babel-eslint }}"
           skip-ls-check: true
         env:
           NPM_CONFIG_LEGACY_PEER_DEPS: true

package.json

@@ -43,18 +43,18 @@
     "string.prototype.matchall": "^4.0.5"
   },
   "devDependencies": {
-    "@types/eslint": "=7.2.10",
-    "@types/estree": "^0.0.47",
-    "@types/node": "^14.14.37",
-    "@typescript-eslint/parser": "^2.34.0 || ^3.10.1 || ~4.0",
+    "@types/eslint": "^7.28.0",
+    "@types/estree": "^0.0.50",
+    "@types/node": "^14.17.12",
+    "@typescript-eslint/parser": "^2.34.0 || ^3.10.1 || ^4.0.0 || ^5.0.0-0",
     "aud": "^1.1.5",
     "babel-eslint": "^8 || ^9 || ^10.1.0",
-    "eslint": "^3 || ^4 || ^5 || ^6 || ^7",
+    "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8.0.0-0",
     "eslint-config-airbnb-base": "^14.2.1",
-    "eslint-plugin-eslint-plugin": "^2.3.0 || ^3.3.1",
+    "eslint-plugin-eslint-plugin": "^2.3.0 || ^3.5.3",
     "eslint-plugin-import": "^2.24.2",
     "eslint-remote-tester": "^1.3.0",
-    "eslint-remote-tester-repositories": "^0.0.2",
+    "eslint-remote-tester-repositories": "^0.0.3",
     "espree": "^3.5.4",
     "istanbul": "^0.4.5",
     "markdown-magic": "^2.5.2",
@@ -65,7 +65,7 @@
     "typescript-eslint-parser": "^20.1.1"
   },
   "peerDependencies": {
-    "eslint": "^3 || ^4 || ^5 || ^6 || ^7"
+    "eslint": "^3 || ^4 || ^5 || ^6 || ^7 || ^8.0.0-0"
   },
   "engines": {
     "node": ">=4"

tests/helpers/getESLintCoreRule.js

@@ -0,0 +1,11 @@
+'use strict';
+
+const version = require('eslint/package.json').version;
+const semver = require('semver');
+
+const isESLintV8 = semver.major(version) >= 8;
+
+// eslint-disable-next-line global-require, import/no-dynamic-require, import/no-unresolved
+const getESLintCoreRule = (ruleId) => (isESLintV8 ? require('eslint/use-at-your-own-risk').builtinRules.get(ruleId) : require(`eslint/lib/rules/${ruleId}`));
+
+module.exports = getESLintCoreRule;

tests/lib/rules/jsx-no-undef.js

@@ -28,8 +28,8 @@ const parserOptions = {
 // -----------------------------------------------------------------------------
 
 const ruleTester = new RuleTester({parserOptions});
-const linter = ruleTester.linter || eslint.linter;
-linter.defineRule('no-undef', require('eslint/lib/rules/no-undef'));
+const linter = ruleTester.linter || eslint.linter || eslint.Linter;
+linter.defineRule('no-undef', require('../../helpers/getESLintCoreRule')('no-undef'));
 
 ruleTester.run('jsx-no-undef', rule, {
   valid: [{

tests/lib/rules/jsx-no-useless-fragment.js

@@ -8,12 +8,10 @@
 // Requirements
 // -----------------------------------------------------------------------------
 
-const eslint = require('eslint');
+const RuleTester = require('eslint').RuleTester;
 const rule = require('../../../lib/rules/jsx-no-useless-fragment');
 const parsers = require('../../helpers/parsers');
 
-const RuleTester = eslint.RuleTester;
-
 const parserOptions = {
   ecmaVersion: 2018,
   ecmaFeatures: {

tests/lib/rules/jsx-uses-react.js

@@ -10,7 +10,7 @@
 // -----------------------------------------------------------------------------
 
 const eslint = require('eslint');
-const rule = require('eslint/lib/rules/no-unused-vars');
+const rule = require('../../helpers/getESLintCoreRule')('no-unused-vars');
 
 const RuleTester = eslint.RuleTester;
 
@@ -35,7 +35,7 @@ const settings = {
 // -----------------------------------------------------------------------------
 
 const ruleTester = new RuleTester({parserOptions});
-const linter = ruleTester.linter || eslint.linter;
+const linter = ruleTester.linter || eslint.linter || eslint.Linter;
 linter.defineRule('jsx-uses-react', require('../../../lib/rules/jsx-uses-react'));
 
 ruleTester.run('no-unused-vars', rule, {

tests/lib/rules/jsx-uses-vars.js

@@ -10,8 +10,8 @@
 // -----------------------------------------------------------------------------
 
 const eslint = require('eslint');
-const ruleNoUnusedVars = require('eslint/lib/rules/no-unused-vars');
-const rulePreferConst = require('eslint/lib/rules/prefer-const');
+const ruleNoUnusedVars = require('../../helpers/getESLintCoreRule')('no-unused-vars');
+const rulePreferConst = require('../../helpers/getESLintCoreRule')('prefer-const');
 
 const RuleTester = eslint.RuleTester;
 
@@ -30,7 +30,7 @@ const parserOptions = {
 // -----------------------------------------------------------------------------
 
 const ruleTester = new RuleTester({parserOptions});
-const linter = ruleTester.linter || eslint.linter;
+const linter = ruleTester.linter || eslint.linter || eslint.Linter;
 linter.defineRule('jsx-uses-vars', require('../../../lib/rules/jsx-uses-vars'));
 
 ruleTester.run('no-unused-vars', ruleNoUnusedVars, {