Migrate ESLint configuration

ESLint 9.x introduced a new format for the configuration file. The old
configuration file has been migrated to the new format using the guide
and provided CLI[^1].

[^1]: https://eslint.org/docs/latest/use/configure/migration-guide#migrate-your-config-file

eslint.config.mjs

@@ -0,0 +1,40 @@
+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,
+      },
+
+      parser: tsParser,
+      ecmaVersion: "latest",
+      sourceType: "module",
+    },
+
+    rules: {},
+  },
+];