prepare for better integration and testing

package.json

@@ -6,8 +6,10 @@
   "directories": {
     "lib": "lib"
   },
+  "type": "module",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "NODE_OPTIONS=--experimental-vm-modules jest",
+    "lint": "eslint --fix . && echo 'Lint complete.'"
   },
   "repository": {
     "type": "git",
@@ -21,7 +23,7 @@
   "homepage": "https://github.com/xkjq/rts#readme",
   "devDependencies": {
     "eslint": "^6.8.0",
-    "eslint-config-google": "^0.14.0"
-  },
-  "lint": "eslint --fix . && echo 'Lint complete.'"
-}
+    "eslint-config-google": "^0.14.0",
+    "jest": "^30.4.2"
+  }
+}