webpack.config.js

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

module.exports = {
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: '/node_modules/',
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.html$/,
        use: {
          loader: 'html-loader',
        },
      },
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader',
      },
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
        loader: 'url-loader',
        options: {
          limit: 10000,
        },
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.jsx'],
  },
  devServer: {
    historyApiFallback: true,
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: './src/index.html',
      filename: './index.html',
    }),
    new CopyWebpackPlugin([
      {
        from: './node_modules/bootstrap/dist/css/bootstrap.min.css',
        to: 'css',
        flatten: true,
      },
    ]),
  ],
};