deps: update eslint to v9

html-to-react/.eslintrc.cjs

@@ -1,30 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
- *
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-module.exports = {
-    "parser": "@typescript-eslint/parser",
-    "parserOptions": {
-        "project": [
-            "./tsconfig.test.json"
-        ]
-    },
-    "plugins": [
-        "@typescript-eslint",
-        "prettier"
-    ],
-    "extends": [
-        "eslint:recommended",
-        "plugin:@typescript-eslint/eslint-recommended",
-        "plugin:@typescript-eslint/recommended-requiring-type-checking",
-        "plugin:@typescript-eslint/recommended",
-        "prettier"
-    ],
-    "rules": {
-        "prettier/prettier": ["error",
-            require('./.prettierrc.json')
-        ],
-    }
-}

html-to-react/eslint.config.mjs

@@ -0,0 +1,52 @@
+import { defineConfig } from 'eslint/config'
+import typescriptEslint from '@typescript-eslint/eslint-plugin'
+import prettier from 'eslint-plugin-prettier'
+import tsParser from '@typescript-eslint/parser'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import js from '@eslint/js'
+import { FlatCompat } from '@eslint/eslintrc'
+import prettierConfig from './.prettierrc.json' with { type: 'json' }
+import vitest from '@vitest/eslint-plugin'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all
+})
+
+export default defineConfig([
+  {
+    extends: compat.extends(
+      'eslint:recommended',
+      'plugin:@typescript-eslint/eslint-recommended',
+      'plugin:@typescript-eslint/recommended-requiring-type-checking',
+      'plugin:@typescript-eslint/recommended',
+      'prettier'
+    ),
+
+    plugins: {
+      '@typescript-eslint': typescriptEslint,
+      prettier,
+      vitest
+    },
+
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 5,
+      sourceType: 'script',
+
+      parserOptions: {
+        project: ['./tsconfig.test.json']
+      }
+    },
+
+    rules: {
+      'prettier/prettier': ['error', prettierConfig],
+
+      ...vitest.configs.recommended.rules
+    }
+  }
+])

html-to-react/package.json

@@ -50,15 +50,15 @@
   "devDependencies": {
     "@types/react": "18.3.11",
     "@types/react-dom": "18.3.1",
-    "@typescript-eslint/eslint-plugin": "8.14.0",
-    "@typescript-eslint/parser": "8.14.0",
-    "eslint": "8.57.1",
-    "eslint-config-prettier": "9.1.0",
-    "eslint-plugin-prettier": "5.2.3",
+    "@vitest/eslint-plugin": "1.1.43",
+    "eslint": "9.25.1",
+    "eslint-config-prettier": "10.1.2",
+    "eslint-plugin-prettier": "5.2.6",
     "prettier": "3.3.3",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "typescript": "5.6.3",
+    "typescript-eslint": "8.31.0",
     "vitest": "3.1.2"
   },
   "dependencies": {