feature(eslint-config): add types (#1162)

fixes #1157

.changeset/hot-singers-smell.md

@@ -0,0 +1,5 @@
+---
+'@hono/eslint-config': patch
+---
+
+Add type declaration

packages/eslint-config/index.js

@@ -4,6 +4,9 @@ import importX from 'eslint-plugin-import-x'
 import nodePlugin from 'eslint-plugin-n'
 import tseslint from 'typescript-eslint'
 
+/**
+ * @type {import("eslint").Linter.Config[]}
+ */
 export default [
   js.configs.recommended,
   nodePlugin.configs['flat/recommended'],