webpack.config.js

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

module.exports = {
  mode: 'development',
  entry: {
    app: './src/index.js',
  },
  devtool: 'inline-source-map',
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        }
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: 'postcss-loader',
            options: {
              ident: 'postcss',
              plugins: [
                require('autoprefixer'),
              ],
            },
          },
        ],
      },
      {
        test: /\.(gif|png|jpe?g|svg)$/i,
        use: [
          'file-loader',
          {
            loader: 'image-webpack-loader',
            options: {
              bypassOnDebug: true, // webpack@1.x
              disable: true, // webpack@2.x and newer
            },
          },
        ],
      }
    ]
  },
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'lib'),
  },
  devServer: {
    contentBase: path.join(__dirname, 'lib'),
    compress: true,
    port: 9000
  }
};