Updated babel/webpack

config/webpack.config.js

@@ -10,6 +10,7 @@ const PORT = process.env.PORT || "8888";
 
 module.exports = {
   target: 'web',
+  mode: 'development',
   entry: [
     `webpack-dev-server/client?http://${HOST}:${PORT}`,
     `webpack/hot/only-dev-server`,
@@ -27,7 +28,7 @@ module.exports = {
     noParse: [
       /mapbox-gl\/dist\/mapbox-gl.js/
     ],
-    loaders: loaders
+    rules: loaders
   },
   node: {
     fs: "empty",