chore: adds "exports.types" option to package.json

package.json

@@ -7,7 +7,8 @@
   "main": "./dist/cjs/index.cjs",
   "exports": {
     "import": "./src/index.js",
-    "require": "./dist/cjs/index.cjs"
+    "require": "./dist/cjs/index.cjs",
+    "types": "./src/index.d.ts"
   },
   "engines": {
     "node": ">=12"