These are optional modules

--- a/package.json
+++ b/package.json
@@ -39,10 +39,6 @@
     "grunt-cli": "^1.2.0",
     "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-nodeunit": "^1.0.0",
-    "grunt-contrib-watch": "^1.0.0",
-    "grunt-eslint": "^19.0.0",
-    "grunt-karma": "^2.0.0",
-    "grunt-ts": "^6.0.0-beta.3",
     "grunt-webpack": "^1.0.18",
     "istanbul-instrumenter-loader": "^1.0.0",
     "jasmine-core": "^2.4.1",