Upgrade eslint config

.eslintrc.json

@@ -1,39 +0,0 @@
-{
-  "env": {
-    "node": true,
-    "es2021": true,
-    "jest": true
-  },
-  "extends": [
-    "eslint:recommended",
-    "plugin:@typescript-eslint/recommended",
-    "prettier"
-  ],
-  "parser": "@typescript-eslint/parser",
-  "parserOptions": {
-    "ecmaVersion": "latest",
-    "sourceType": "module"
-  },
-  "plugins": [
-    "@typescript-eslint"
-  ],
-  "rules": {
-    "@typescript-eslint/no-var-requires": "off",
-    "no-case-declarations": "off",
-    "linebreak-style": [
-      "error",
-      "unix"
-    ],
-    "quotes": [
-      "error",
-      "single",
-      {
-        "avoidEscape": true
-      }
-    ],
-    "semi": [
-      "error",
-      "never"
-    ]
-  }
-}

eslint.config.mjs

@@ -0,0 +1,51 @@
+import typescriptEslint from '@typescript-eslint/eslint-plugin'
+import globals from 'globals'
+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'
+
+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 [
+  ...compat.extends('eslint:recommended', 'plugin:@typescript-eslint/recommended', 'prettier'),
+  {
+    plugins: {
+      '@typescript-eslint': typescriptEslint
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.jest
+      },
+
+      parser: tsParser,
+      ecmaVersion: 'latest',
+      sourceType: 'module'
+    },
+
+    rules: {
+      '@typescript-eslint/no-var-requires': 'off',
+      'no-case-declarations': 'off',
+      'linebreak-style': ['error', 'unix'],
+
+      quotes: [
+        'error',
+        'single',
+        {
+          avoidEscape: true
+        }
+      ],
+
+      semi: ['error', 'never']
+    }
+  }
+]