webpack.config.js

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

module.exports = {
  entry: {
    background: ['babel-polyfill', './src/background.js'],
    main: './src/medium-unlocker.js',
  },
  output: {
    filename: '[name].bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
            options: {
              modules: true,
              importLoaders: 1,
              localIdentName: '[name]_[local]_[hash:base64]',
              sourceMap: true,
              minimize: true,
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new CopyWebpackPlugin(
      [
        {from: 'static', to: 'static'},
        {from: 'src/html', to: 'html'},
        {from: 'manifest.json', to: 'manifest.json'},
      ],
      {debug: true, context: '.'}
    ),
  ],
};