Add a types entry for TypeScript.

Author: dmitrizagidulin

package.json

@@ -9,6 +9,7 @@
     "require": "./dist/cjs/index.cjs",
     "import": "./lib/index.js"
   },
+  "types": "types/index.d.ts",
   "browser": {
     "./lib/agentCompatibility.js": "./lib/agentCompatibility-browser.js",
     "./tests/utils.cjs": "./tests/utils-browser.cjs"