Moment is a proper dependency.

bikeshop_project/package.json

@@ -10,6 +10,9 @@
 },
   "author": "",
   "license": "ISC",
+  "dependencies": {
+    "moment": "^2.13.0"
+  },
   "devDependencies": {
     "babel": "^6.5.2",
     "babel-core": "^6.9.1",
@@ -23,7 +26,6 @@
     "i": "^0.3.5",
     "isomorphic-fetch": "^2.2.1",
     "material-ui": "^0.15.0",
-    "moment": "^2.13.0",
     "node-sass": "^3.4.2",
     "normalize.css": "^4.1.1",
     "postcss-loader": "^0.9.1",