diff --git a/tools/upend_js/package.json b/tools/upend_js/package.json
index 21ccbcc..91bf124 100644
--- a/tools/upend_js/package.json
+++ b/tools/upend_js/package.json
@@ -3,7 +3,7 @@
   "version": "0.0.1",
   "description": "Client library to interact with the UpEnd system.",
   "scripts": {
-    "build": "tsc",
+    "build": "tsc --build --listFiles --verbose",
     "test": "ava",
     "lint": "eslint ."
   },