fix: add types field for node16/nodenext module resolution (#462)

Author: LiamMartens

package.json

@@ -20,6 +20,7 @@
   "types": "dist/index.d.ts",
   "exports": {
     ".": {
+      "types": "./dist/index.d.ts",
       "import": "./dist/index.mjs",
       "require": "./dist/index.cjs"
     }