webpack.config.common.js

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

module.exports = {
  entry: ['@babel/polyfill', './src/index.js'],
  output: {
    path: `${__dirname}/dist`,
    publicPath: '/',
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
      {
        test: /\.s?css/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.(gif|png|jpe?g|woff|woff2|eot|ttf|svg)$/i,
        use: [
          'file-loader',
        ],
      },
    ],
  },
  resolve: {
    extensions: ['*', '.js', '.jsx', '.css', '.scss'],
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: './index.html',
    }),
  ],
};