diff --git a/Makefile b/Makefile
index 7f700a5..2a250a7 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,7 @@ lib/maxmind :
 .PHONY : fmt
 fmt :
 	bun x prettier --write .
+	bun x eslint --fix .
 	@ git diff-index --quiet HEAD
 
 .PHONY : test
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..8ef5a3f
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,76 @@
+// @ts-check
+
+import fs from 'node:fs';
+
+import eslint from '@eslint/js';
+import prettierConfig from 'eslint-config-prettier';
+import importPlugin from 'eslint-plugin-import';
+import jest from 'eslint-plugin-jest';
+import react from 'eslint-plugin-react';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  {
+    ignores: ['eslint.config.js'].concat(
+      fs.readFileSync('.gitignore', 'utf8').split('\n').filter(Boolean),
+    ),
+  },
+
+  eslint.configs.recommended,
+  ...tseslint.configs.strictTypeChecked,
+  {
+    languageOptions: {
+      parserOptions: {
+        project: true,
+        ecmaFeatures: { jsx: true },
+      },
+    },
+  },
+  prettierConfig,
+
+  {
+    linterOptions: {
+      reportUnusedDisableDirectives: 'error',
+    },
+    plugins: {
+      import: importPlugin,
+      react,
+    },
+  },
+
+  {
+    settings: {
+      'import/core-modules': ['bun:test'],
+    },
+
+    rules: {
+      'import/order': [
+        'error',
+        { alphabetize: { order: 'asc' }, 'newlines-between': 'always' },
+      ],
+      'no-unused-vars': [
+        'error',
+        { varsIgnorePattern: '[iI]gnored', argsIgnorePattern: '^_' },
+      ],
+      curly: 'error',
+      'default-case': 'error',
+    },
+  },
+  {
+    files: ['**/*.ts', '**/*.tsx', '**/*.mts'],
+    rules: {
+      'no-unused-vars': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        { varsIgnorePattern: '[iI]gnored', argsIgnorePattern: '^_' },
+      ],
+      'no-void': ['error', { allowAsStatement: true }],
+    },
+  },
+  {
+    files: ['**/*.spec.ts', '**/*.spec.tsx'],
+    plugins: { jest },
+    settings: { jest: { version: 29 } },
+    ...jest.configs['flat/recommended'],
+  },
+);
diff --git a/package.json b/package.json
index e1f8d11..70b1439 100644
--- a/package.json
+++ b/package.json
@@ -13,8 +13,16 @@
     "mmdb-lib": "^2.1.1"
   },
   "devDependencies": {
+    "@eslint/js": "^9.4.0",
     "@types/bun": "latest",
+    "@types/eslint__js": "^8.42.3",
+    "eslint": "^9.4.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-import": "^2.29.1",
+    "eslint-plugin-jest": "^28.6.0",
+    "eslint-plugin-react": "^7.34.2",
     "prettier": "^3.3.1",
+    "typescript-eslint": "^7.12.0",
     "webpack-cli": "^5.1.4"
   },
   "peerDependencies": {