and of course add types reference

Author: Eran Levin

package.json

@@ -47,5 +47,6 @@
     "xo": "^0.23.0"
   },
   "main": "./src/index.js",
-  "browser": "./src/browser.js"
+  "browser": "./src/browser.js",
+  "types": "./src/index.d.ts"
 }