fix: allow importing with exports-aware Typescript

Author: charlag

package.json

@@ -16,6 +16,7 @@
   "main": "dist/index.cjs",
   "module": "dist/index.mjs",
   "exports": {
+    "types": "./dist/lib/index.d.ts",
     "import": "./dist/index.mjs",
     "require": "./dist/index.cjs"
   },