cleanup

testutils/package.json

@@ -25,10 +25,10 @@
     "url": "https://github.com/jupyterlab/jupyterlab.git"
   },
   "scripts": {
-    "build": "tsc -b src",
+    "build": "tsc",
     "clean": "rimraf lib",
     "prepublishOnly": "npm run build",
-    "watch": "tsc -b src --watch"
+    "watch": "tsc --watch"
   },
   "dependencies": {
     "@jupyterlab/apputils": "^0.19.1-alpha.0",