chore: update to ESLint 9

.github/renovate.json5

@@ -34,7 +34,7 @@
     {
       groupName: 'lint',
       matchPackageNames: ['simple-git-hooks', 'lint-staged'],
-      matchPackagePrefixes: ['@typescript-eslint', 'eslint', 'prettier'],
+      matchPackagePrefixes: ['typescript-eslint', 'eslint', 'prettier'],
     },
   ],
   ignoreDeps: [

eslint.config.js

@@ -0,0 +1,168 @@
+import importX from 'eslint-plugin-import-x'
+import tseslint from 'typescript-eslint'
+import vitest from 'eslint-plugin-vitest'
+import { builtinModules } from 'node:module'
+
+const DOMGlobals = ['window', 'document']
+const NodeGlobals = ['module', 'require']
+
+const banConstEnum = {
+  selector: 'TSEnumDeclaration[const=true]',
+  message:
+    'Please use non-const enums. This project automatically inlines enums.',
+}
+
+export default tseslint.config(
+  {
+    files: ['**/*.js', '**/*.ts', '**/*.tsx'],
+    extends: [tseslint.configs.base],
+    plugins: {
+      'import-x': importX,
+    },
+    rules: {
+      'no-debugger': 'error',
+      'no-console': ['error', { allow: ['warn', 'error', 'info'] }],
+      // most of the codebase are expected to be env agnostic
+      'no-restricted-globals': ['error', ...DOMGlobals, ...NodeGlobals],
+
+      'no-restricted-syntax': [
+        'error',
+        banConstEnum,
+        {
+          selector: 'ObjectPattern > RestElement',
+          message:
+            'Our output target is ES2016, and object rest spread results in ' +
+            'verbose helpers and should be avoided.',
+        },
+        {
+          selector: 'ObjectExpression > SpreadElement',
+          message:
+            'esbuild transpiles object spread into very verbose inline helpers.\n' +
+            'Please use the `extend` helper from @vue/shared instead.',
+        },
+        {
+          selector: 'AwaitExpression',
+          message:
+            'Our output target is ES2016, so async/await syntax should be avoided.',
+        },
+      ],
+      'sort-imports': ['error', { ignoreDeclarationSort: true }],
+
+      'import-x/no-nodejs-modules': [
+        'error',
+        { allow: builtinModules.map(mod => `node:${mod}`) },
+      ],
+      // This rule enforces the preference for using '@ts-expect-error' comments in TypeScript
+      // code to indicate intentional type errors, improving code clarity and maintainability.
+      '@typescript-eslint/prefer-ts-expect-error': 'error',
+      // Enforce the use of 'import type' for importing types
+      '@typescript-eslint/consistent-type-imports': [
+        'error',
+        {
+          fixStyle: 'inline-type-imports',
+          disallowTypeAnnotations: false,
+        },
+      ],
+      // Enforce the use of top-level import type qualifier when an import only has specifiers with inline type qualifiers
+      '@typescript-eslint/no-import-type-side-effects': 'error',
+    },
+  },
+
+  // tests, no restrictions (runs in Node / Vitest with jsdom)
+  {
+    files: ['**/__tests__/**', 'packages/dts-test/**'],
+    plugins: { vitest },
+    languageOptions: {
+      globals: {
+        ...vitest.environments.env.globals,
+      },
+    },
+    rules: {
+      'no-console': 'off',
+      'no-restricted-globals': 'off',
+      'no-restricted-syntax': 'off',
+      'vitest/no-disabled-tests': 'error',
+      'vitest/no-focused-tests': 'error',
+    },
+  },
+
+  // shared, may be used in any env
+  {
+    files: ['packages/shared/**', 'eslint.config.js'],
+    rules: {
+      'no-restricted-globals': 'off',
+    },
+  },
+
+  // Packages targeting DOM
+  {
+    files: ['packages/{vue,vue-compat,runtime-dom}/**'],
+    rules: {
+      'no-restricted-globals': ['error', ...NodeGlobals],
+    },
+  },
+
+  // Packages targeting Node
+  {
+    files: ['packages/{compiler-sfc,compiler-ssr,server-renderer}/**'],
+    rules: {
+      'no-restricted-globals': ['error', ...DOMGlobals],
+      'no-restricted-syntax': ['error', banConstEnum],
+    },
+  },
+
+  // Private package, browser only + no syntax restrictions
+  {
+    files: ['packages/template-explorer/**', 'packages/sfc-playground/**'],
+    rules: {
+      'no-restricted-globals': ['error', ...NodeGlobals],
+      'no-restricted-syntax': ['error', banConstEnum],
+      'no-console': 'off',
+    },
+  },
+
+  // JavaScript files
+  {
+    files: ['*.js'],
+    rules: {
+      // We only do `no-unused-vars` checks for js files, TS files are checked by TypeScript itself.
+      'no-unused-vars': ['error', { vars: 'all', args: 'none' }],
+    },
+  },
+
+  // Node scripts
+  {
+    files: [
+      'eslint.config.js',
+      'rollup.config.js',
+      'scripts/**',
+      './*.{js,ts}',
+      'packages/*/*.js',
+      'packages/vue/*/*.js',
+    ],
+    rules: {
+      'no-restricted-globals': 'off',
+      'no-restricted-syntax': ['error', banConstEnum],
+      'no-console': 'off',
+    },
+  },
+
+  // Import nodejs modules in compiler-sfc
+  {
+    files: ['packages/compiler-sfc/src/**'],
+    rules: {
+      'import-x/no-nodejs-modules': ['error', { allow: builtinModules }],
+    },
+  },
+
+  {
+    ignores: [
+      '**/dist/',
+      '**/temp/',
+      '**/coverage/',
+      '.idea/',
+      'explorations/',
+      'dts-build/packages',
+    ],
+  },
+)

package.json

@@ -13,7 +13,7 @@
     "size-esm-runtime": "node scripts/build.js vue -f esm-bundler-runtime",
     "size-esm": "node scripts/build.js runtime-dom runtime-core reactivity shared -f esm-bundler",
     "check": "tsc --incremental --noEmit",
-    "lint": "eslint --cache --ext .js,.ts,.tsx . --ignore-path .gitignore",
+    "lint": "eslint --cache .",
     "format": "prettier --write --cache .",
     "format-check": "prettier --check --cache .",
     "test": "vitest",
@@ -72,18 +72,15 @@
     "@types/minimist": "^1.2.5",
     "@types/node": "^20.12.5",
     "@types/semver": "^7.5.8",
-    "@typescript-eslint/eslint-plugin": "^7.4.0",
-    "@typescript-eslint/parser": "^7.4.0",
     "@vitest/coverage-istanbul": "^1.4.0",
     "@vue/consolidate": "1.0.0",
     "conventional-changelog-cli": "^4.1.0",
     "enquirer": "^2.4.1",
     "esbuild": "^0.20.2",
     "esbuild-plugin-polyfill-node": "^0.3.0",
-    "eslint": "^8.57.0",
-    "eslint-define-config": "^2.1.0",
-    "eslint-plugin-import": "npm:eslint-plugin-i@^2.29.1",
-    "eslint-plugin-jest": "^27.9.0",
+    "eslint": "^9.0.0",
+    "eslint-plugin-import-x": "^0.5.0",
+    "eslint-plugin-vitest": "^0.5.3",
     "estree-walker": "^2.0.2",
     "execa": "^8.0.1",
     "jsdom": "^24.0.0",
@@ -112,7 +109,19 @@
     "tslib": "^2.6.2",
     "tsx": "^4.7.2",
     "typescript": "~5.4.5",
+    "typescript-eslint": "^7.6.0",
     "vite": "^5.2.7",
     "vitest": "^1.4.0"
+  },
+  "pnpm": {
+    "peerDependencyRules": {
+      "allowedVersions": {
+        "typescript-eslint>eslint": "^9.0.0",
+        "@typescript-eslint/eslint-plugin>eslint": "^9.0.0",
+        "@typescript-eslint/parser>eslint": "^9.0.0",
+        "@typescript-eslint/type-utils>eslint": "^9.0.0",
+        "@typescript-eslint/utils>eslint": "^9.0.0"
+      }
+    }
   }
 }

packages/compiler-core/__tests__/parse.spec.ts

@@ -16,8 +16,6 @@ import {
 import { baseParse } from '../src/parser'
 import type { Program } from '@babel/types'
 
-/* eslint jest/no-disabled-tests: "off" */
-
 describe('compiler: parse', () => {
   describe('Text', () => {
     test('simple text', () => {

packages/runtime-core/src/components/Suspense.ts

@@ -814,7 +814,6 @@ function hydrateSuspense(
     suspense.resolve(false, true)
   }
   return result
-  /* eslint-enable no-restricted-globals */
 }
 
 function normalizeSuspenseChildren(vnode: VNode) {