Upgrade to ESLint 9

.eslint.ts

@@ -0,0 +1,51 @@
+import type { FlatESLintConfig } from '@aet/eslint-define-config';
+import js from '@eslint/js';
+import * as tsParser from '@typescript-eslint/parser';
+import importPlugin from 'eslint-plugin-import-x';
+import unicorn from 'eslint-plugin-unicorn';
+import tsEslint from 'typescript-eslint';
+
+import { importRules } from './src/presets/typescript';
+
+export default [
+  js.configs.recommended, //
+  ...tsEslint.configs.recommendedTypeChecked,
+  unicorn.configs['flat/recommended'],
+  importPlugin.flatConfigs.recommended,
+  importPlugin.flatConfigs.react,
+  importPlugin.flatConfigs.typescript,
+  {
+    files: ['**/*.{js,mjs,cjs,jsx,mjsx,ts,tsx,mtsx}'],
+    languageOptions: {
+      parserOptions: {
+        parser: tsParser,
+        projectService: true,
+        ecmaVersion: 'latest',
+        // https://github.com/unjs/jiti/issues/167 import.meta.dirname
+        tsconfigRootDir: __dirname,
+        sourceType: 'module',
+      },
+    },
+    settings: {
+      'import-x/parsers': {
+        '@typescript-eslint/parser': ['.ts', '.tsx', '.mts', '.cts'],
+      },
+      'import-x/resolver': {
+        typescript: true,
+        node: true,
+      },
+    },
+    ignores: ['eslint.config.cjs'],
+    rules: {
+      ...importRules,
+    },
+  },
+  {
+    rules: {
+      'unicorn/prevent-abbreviations': 'off',
+      'unicorn/import-style': 'off',
+      'unicorn/switch-case-braces': ['error', 'avoid'],
+      'unicorn/no-null': 'off',
+    },
+  },
+] as FlatESLintConfig[];