Add missing null-loader, upgrade @types/node.

package.json

@@ -36,6 +36,7 @@
     "loglevel": "^1.6.1",
     "ngtemplate-loader": "^2.0.1",
     "node-sass": "^4.7.2",
+    "null-loader": "^0.1.1",
     "raw-loader": "^0.5.1",
     "sass-loader": "^7.0.2",
     "script-ext-html-webpack-plugin": "^2.0.1",
@@ -64,7 +65,7 @@
     "@swimlane/ngx-charts": "^8.0.2",
     "@types/d3": "^5.0.0",
     "@types/geojson": "^7946.0.3",
-    "@types/node": "^10.3.1",
+    "@types/node": "^10.3.2",
     "@types/underscore": "^1.8.8",
     "angular2-text-mask": "^9.0.0",
     "base64util": "^2.0.0-f",