webpack.config.production.js

const webpack = require('webpack');
// Module to provide plugins by default, in this case BrowserSyncPlugin
// or CleanWebpackPlugin (valid for jQuery too, see previous version)
const path = require('path');
// Module path require to define entry and out point, and the public folder
const HtmlWebpackPlugin = require('html-webpack-plugin')
// Plugin to inject an HTML template in develop and production mode
const ExtractTextPlugin = require('extract-text-webpack-plugin');
// Plugin to create a bundle css apart of javascript


module.exports = {
  // Development Mode [is] optimized for speed and developer experience
  mode: 'production',

  // Entry point to compile and create bundle
  entry: `${path.resolve(__dirname, 'src')}/js/index.js`,

  // Outpoint to compile in bundle.js all the files
  output: {
    path: path.join(__dirname, 'dist'),
    // Path to output
    filename: 'static/bundle.[hash].js',
    // This is the result, bundle.[hash].js
    // [hash] is a portion of the filename that will be replaced every time
    // you bundle => helps with caching
    publicPath: '/',
    // Where the files are available in the server
  },

  module: {
    rules: [
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: ['css-loader', 'postcss-loader'],
        }),
      },
      {
        test: /\.scss$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: ['css-loader', 'postcss-loader', 'sass-loader'],
        }),
      },
      {
        test: /\.js$/,
        include: path.resolve(__dirname, 'src'),
        exclude: /(node_modules)/,
        loader: 'babel-loader',
      },
      {
        test: /\.(png|jpe?g|gif|svg)(\?[\s\S]+)?$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[hash].[ext]',
              outputPath: 'images/',
              useRelativePath: process.env.NODE_ENV === "production"
            }
          }
        ]
      },
    ],
  },

  plugins: [
    new HtmlWebpackPlugin({
      template: './public/index.html',
      favicon: './public/favicon.ico'
    }),
    new ExtractTextPlugin({
      filename: 'styles/styles.[hash].css',
      allChunks: true,
      disable: process.env.NODE_ENV !== 'production'
    })
  ]
}