webpack.config.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
// var ExtractTextPlugin = require('extract-text-webpack-plugin');
// const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  entry: ['./src/app/index.js', './src/styles/main.scss'],
  target: 'web',
  module: {
    rules: [
      {
        test: /\.(js)$/,
        exclude: /node_modules/,
        use: ['babel-loader'],
      },
      // Extracts the compiled CSS from the SASS files defined in the entry
      {
        test: /\.scss$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'file-loader',
            options: { name: 'main.css' },
          },
          'sass-loader',
        ],
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      title: 'webpack Boilerplate',
      template: path.resolve(__dirname, './src/template.html'), // template file
      filename: 'index.html', // output file
    }),
    new CleanWebpackPlugin(),
    new webpack.HotModuleReplacementPlugin(),
  ],
  resolve: {
    extensions: ['*', '.js'],
  },
  devtool: 'source-map',
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'bundle.js',
  },
  devServer: {
    contentBase: path.resolve(__dirname, './src'),
    watchContentBase: true,
    hot: true,
  },
};