clean up

webpack.config.js

@@ -1,6 +1,7 @@
 const HtmlWebPackPlugin = require('html-webpack-plugin');
 
 module.exports = {
+  mode: 'development',
   resolve: {
     extensions: ['.js', '.jsx']
   },

webpack.config.prod.js

@@ -3,10 +3,8 @@ const webpack = require('webpack');
 const path = require('path');
 const WorkboxWebpackPlugin = require('workbox-webpack-plugin');
 
-module.exports = env => {
-  const mode = env.mode ? env.mode : "production";
-  return {
-    mode,
+module.exports = {
+  mode: 'production',
   entry: {
     main: './src/index.js'
   },
@@ -71,5 +69,4 @@ module.exports = env => {
       }
     ]
   }
-  };
 };