webpack.config.js

const webpack = require('webpack');
const path = require('path');
const HtmlWebPackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: {
    app: './app/src/app.js',
  },
  devtool: 'inline-source-map',
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'app.js',
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [{ loader: 'style-loader' }, { loader: 'css-loader' }],
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.html$/,
        use: [
          {
            loader: 'html-loader',
          },
        ],
      },
      {
        test: /\.s[ac]ss$/i,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
    ],
  },
  devServer: {
    hot: true,
    port: 4200,
  },
  plugins: [
    new HtmlWebPackPlugin({
      inject: true,
      template: 'app/templates/index.html',
    }),
    new webpack.HotModuleReplacementPlugin(),
  ],
};