chore: upgrade to eslint 9

eslint.config.js

@@ -0,0 +1,156 @@
+// @ts-check
+import { builtinModules } from 'node:module'
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import nodePlugin from 'eslint-plugin-n'
+import * as regexpPlugin from 'eslint-plugin-regexp'
+import importPlugin from 'eslint-plugin-import-x'
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  nodePlugin.configs['flat/recommended'],
+  regexpPlugin.configs['flat/recommended'],
+  { ignores: ['**/dist', '**/playground-temp', '**/temp'] },
+  {
+    plugins: {
+      import: importPlugin,
+    },
+    rules: {
+      eqeqeq: ['warn', 'always', { null: 'never' }],
+      'no-empty': ['warn', { allowEmptyCatch: true }],
+      'no-useless-escape': 'off',
+      'prefer-const': ['warn', { destructuring: 'all' }],
+
+      'n/no-process-exit': 'off',
+      'n/no-missing-import': [
+        'error',
+        {
+          allowModules: ['types', 'estree', 'less', 'sass', 'stylus'],
+          tryExtensions: ['.ts', '.js', '.jsx', '.tsx', '.d.ts'],
+        },
+      ],
+      'n/no-missing-require': [
+        'error',
+        {
+          // for try-catching yarn pnp
+          allowModules: ['pnpapi', 'vite'],
+          tryExtensions: ['.ts', '.js', '.jsx', '.tsx', '.d.ts'],
+        },
+      ],
+      'n/no-extraneous-import': [
+        'error',
+        { allowModules: ['vite', 'less', 'sass', 'vitest', 'unbuild'] },
+      ],
+      'n/no-extraneous-require': ['error', { allowModules: ['vite'] }],
+      'n/no-deprecated-api': 'off',
+      'n/no-unpublished-import': 'off',
+      'n/no-unpublished-require': 'off',
+      'n/no-unsupported-features/es-syntax': 'off',
+
+      '@typescript-eslint/ban-ts-comment': 'off', // TODO: we should turn this on in a new PR
+      '@typescript-eslint/explicit-module-boundary-types': [
+        'error',
+        { allowArgumentsExplicitlyTypedAsAny: true },
+      ],
+      '@typescript-eslint/no-empty-function': [
+        'error',
+        { allow: ['arrowFunctions'] },
+      ],
+      '@typescript-eslint/no-empty-object-type': 'off',
+      '@typescript-eslint/no-explicit-any': 'off', // maybe we should turn this on in a new PR
+      '@typescript-eslint/no-inferrable-types': 'off',
+      '@typescript-eslint/no-unused-vars': 'off', // maybe we should turn this on in a new PR
+      '@typescript-eslint/no-require-imports': 'off',
+      '@typescript-eslint/consistent-type-imports': [
+        'error',
+        { prefer: 'type-imports' },
+      ],
+
+      'import/no-nodejs-modules': [
+        'error',
+        { allow: builtinModules.map((mod) => `node:${mod}`) },
+      ],
+      'import/no-duplicates': 'error',
+      'import/order': 'error',
+      'sort-imports': [
+        'error',
+        {
+          ignoreCase: false,
+          ignoreDeclarationSort: true,
+          ignoreMemberSort: false,
+          memberSyntaxSortOrder: ['none', 'all', 'multiple', 'single'],
+          allowSeparatedGroups: false,
+        },
+      ],
+
+      'regexp/no-contradiction-with-assertion': 'error',
+    },
+  },
+  {
+    files: ['packages/**'],
+    ignores: ['**/__tests__/**'],
+    rules: {
+      'no-restricted-globals': ['error', 'require', '__dirname', '__filename'],
+    },
+  },
+  {
+    files: ['*.spec.ts'],
+    rules: {
+      'n/no-extraneous-import': 'off',
+    },
+  },
+  {
+    files: ['**/build.config.ts'],
+    rules: {
+      'no-undef': 'off',
+      'n/no-missing-import': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+    },
+  },
+  {
+    files: ['playground/**'],
+    rules: {
+      'n/no-extraneous-import': 'off',
+      'n/no-extraneous-require': 'off',
+      'n/no-missing-import': 'off',
+      'n/no-missing-require': 'off',
+      // engine field doesn't exist in playgrounds
+      'n/no-unsupported-features/es-builtins': [
+        'error',
+        {
+          version: '^18.0.0 || >=20.0.0',
+        },
+      ],
+      'n/no-unsupported-features/node-builtins': [
+        'error',
+        {
+          version: '^18.0.0 || >=20.0.0',
+        },
+      ],
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+    },
+  },
+  {
+    files: ['playground/**'],
+    ignores: ['**/__tests__/**'],
+    rules: {
+      'no-undef': 'off',
+      'no-empty': 'off',
+      'no-constant-condition': 'off',
+      '@typescript-eslint/no-empty-function': 'off',
+    },
+  },
+  {
+    files: ['*.js', '*.mjs', '*.cjs'],
+    rules: {
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+    },
+  },
+  {
+    files: ['*.d.ts'],
+    rules: {
+      '@typescript-eslint/triple-slash-reference': 'off',
+    },
+  },
+)

package.json

@@ -37,20 +37,18 @@
   },
   "devDependencies": {
     "@babel/types": "^7.24.7",
+    "@eslint/js": "^9.9.0",
     "@types/babel__core": "^7.20.5",
     "@types/convert-source-map": "^2.0.3",
     "@types/debug": "^4.1.12",
     "@types/fs-extra": "^11.0.4",
     "@types/node": "^20.14.2",
     "@types/resolve": "^1.20.6",
-    "@typescript-eslint/eslint-plugin": "^8.0.0",
-    "@typescript-eslint/parser": "^8.0.0",
     "@vitejs/release-scripts": "^1.3.2",
     "conventional-changelog-cli": "^5.0.0",
-    "eslint": "^8.57.0",
-    "eslint-define-config": "^2.1.0",
-    "eslint-plugin-import": "^2.29.1",
-    "eslint-plugin-n": "^14.0.0",
+    "eslint": "^9.9.0",
+    "eslint-plugin-import-x": "^3.1.0",
+    "eslint-plugin-n": "^17.10.2",
     "eslint-plugin-regexp": "^2.6.0",
     "execa": "^9.2.0",
     "fast-glob": "^3.3.2",
@@ -66,6 +64,7 @@
     "simple-git-hooks": "^2.11.1",
     "tsx": "^4.15.5",
     "typescript": "^5.4.5",
+    "typescript-eslint": "^8.1.0",
     "unbuild": "2.0.0",
     "vite": "catalog:",
     "vitest": "^2.0.0",

packages/plugin-vue/src/handleHotUpdate.ts

@@ -18,7 +18,7 @@ import {
   resolveScript,
   setResolvedScript,
 } from './script'
-import type { ResolvedOptions } from '.'
+import type { ResolvedOptions } from './index'
 
 const debug = _debug('vite:hmr')
 

packages/plugin-vue/src/main.ts

@@ -24,7 +24,7 @@ import { transformTemplateInMain } from './template'
 import { isEqualBlock, isOnlyTemplateChanged } from './handleHotUpdate'
 import { createRollupError } from './utils/error'
 import { EXPORT_HELPER_ID } from './helper'
-import type { ResolvedOptions } from '.'
+import type { ResolvedOptions } from './index'
 
 // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
 export async function transformMain(