included source-maps for debugging locally

webpack.config.js

@@ -4,7 +4,9 @@ const MiniCssExtractPlugin = require('mini-css-extract-plugin')
 const { CleanWebpackPlugin } = require('clean-webpack-plugin')
 const dotenv = require('dotenv')
 const webpack = require('webpack')
-var path = require('path')
+const prod =
+  (process.env.NODE_ENV ? process.env.NODE_ENV : '').trim() === 'production'
+const path = require('path')
 
 module.exports = () => {
   // call dotenv and it will return an Object with a parsed key
@@ -21,7 +23,11 @@ module.exports = () => {
       path: path.resolve(__dirname, 'dist'),
       filename: 'bundle.js',
       publicPath: '/',
+      clean: true,
     },
+    mode: prod ? 'production' : 'development',
+    // Enable sourcemaps for debugging webpack's output.
+    devtool: prod ? 'none' : 'eval-source-map',
     module: {
       rules: [
         {