Update package.json

alleviates issue found with builds using TypeScript akin to microsoft/TypeScript#52363

Author: cpayton-abtech

package.json

@@ -5,7 +5,8 @@
   "exports": {
     ".": {
       "require": "./dist/index.cjs.js",
-      "import": "./dist/index.es.js"
+      "import": "./dist/index.es.js",
+      "types": "./types/index.d.ts"
     }
   },
   "main": "dist/index.cjs",