fix: types for projects with module resolution "bundler" (#38)

Author: noook

package.json

@@ -6,6 +6,7 @@
   "main": "index.js",
   "types": "./index.d.ts",
   "exports": {
+    "types": "./index.d.ts",
     "import": "./index.mjs",
     "require": "./index.js"
   },