webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const path = require('path');

const outputDir = path.join(__dirname, 'build/');
const isProd = process.env.NODE_ENV === 'production';

module.exports = {
  entry: './src/Index.bs.js',
  mode: isProd ? 'production' : 'development',
  output: {
    path: outputDir,
    filename: 'Index.js'
  },
  module: {
    rules: [{
      test: /\.(css|sass|scss)$/,
      exclude: /node_modules/,
      use: [
        {
          loader: MiniCssExtractPlugin.loader,
          options: { hmr: !isProd },
        },
        {
          loader: 'css-loader',
          options: { importLoaders: 1 }
        },
        'sass-loader'
      ]
    }],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.html',
      inject: false
    }),
    new MiniCssExtractPlugin({ filename: 'css/app.css' })
  ],
  devServer: {
    compress: true,
    contentBase: outputDir,
    port: process.env.PORT || 8000,
    historyApiFallback: true
  }
};