webpack.config.babel.js

import webpack from 'webpack';
import ExtractTextPlugin from 'extract-text-webpack-plugin';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import CopyWebpackPlugin from 'copy-webpack-plugin';
import OfflinePlugin from 'offline-plugin';
import path from 'path';
import dotenvWebpack from 'webpack-dotenv-plugin';
import dotenv from 'dotenv';

dotenv.config();

const CSS_MAPS = process.env.NODE_ENV !== 'production';

module.exports = {
  context: path.resolve(__dirname, 'src'),
  entry: './index.js',

  output: {
    path: path.resolve(__dirname, 'build'),
    publicPath: '/',
    filename: 'bundle.js'
  },

  resolve: {
    extensions: ['.jsx', '.js', '.json', '.less'],
    modules: [
      path.resolve(__dirname, 'src/lib'),
      path.resolve(__dirname, 'node_modules'),
      'node_modules'
    ],
    alias: {
      components: path.resolve(__dirname, 'src/components'), // used for tests
      containers: path.resolve(__dirname, 'src/containers'), // used for tests
      style: path.resolve(__dirname, 'src/style'),
      'react': 'preact-compat',
      'react-dom': 'preact-compat'
    }
  },

  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: path.resolve(__dirname, 'src'),
        enforce: 'pre',
        use: 'source-map-loader'
      },
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: 'babel-loader'
      },
      {
        test: /\.p?css$/,
        exclude: [
          path.resolve(__dirname, 'src/components'),
          path.resolve(__dirname, 'src/containers'),
        ],
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            {
              loader: 'css-loader',
              options: {sourceMap: CSS_MAPS, importLoaders: 1}
            },
            {
              loader: `postcss-loader`,
              options: {
                sourceMap: CSS_MAPS
              }
            }
          ]
        })
      },
      {
        test: /\.json$/,
        use: 'json-loader'
      },
      {
        test: /\.(xml|html|txt|md)$/,
        use: 'raw-loader'
      },
      {
        test: /\.(svg|woff2?|ttf|eot|jpe?g|png|gif)(\?.*)?$/i,
        use: process.env.NODE_ENV === 'production' ? 'file-loader' : 'url-loader'
      }
    ]
  },
  plugins: ([
    new webpack.NoEmitOnErrorsPlugin(),
    new ExtractTextPlugin({
      filename: 'style.css',
      allChunks: true,
      disable: process.env.NODE_ENV !== 'production'
    }),

    new HtmlWebpackPlugin({
      template: './index.ejs',
      minify: {collapseWhitespace: true}
    }),
    new CopyWebpackPlugin([
      {from: './manifest.json', to: './'},
      {from: './favicon.ico', to: './'}
    ]),
    // Makes some environment variables available to the JS code, for example:
    // if (process.env.NODE_ENV === 'development') { ... }.
    new dotenvWebpack({
      path: './.env', // Path to .env file (this is the default)
      sample: './.env.example'
    })
  ]).concat(process.env.NODE_ENV === 'production' ? [
    new webpack.optimize.UglifyJsPlugin({
      output: {
        comments: false
      },
      compress: {
        unsafe_comps: true,
        properties: true,
        keep_fargs: false,
        pure_getters: true,
        collapse_vars: true,
        unsafe: true,
        warnings: false,
        screw_ie8: true,
        sequences: true,
        dead_code: true,
        drop_debugger: true,
        comparisons: true,
        conditionals: true,
        evaluate: true,
        booleans: true,
        loops: true,
        unused: true,
        hoist_funs: true,
        if_return: true,
        join_vars: true,
        cascade: true,
        drop_console: true
      }
    }),

    new OfflinePlugin({
      relativePaths: false,
      AppCache: false,
      excludes: ['_redirects'],
      ServiceWorker: {
        events: true
      },
      cacheMaps: [
        {
          match: /.*/,
          to: '/',
          requestTypes: ['navigate']
        }
      ],
      publicPath: '/'
    })
  ] : []),

  stats: {colors: true},

  node: {
    global: true,
    process: false,
    Buffer: false,
    __filename: false,
    __dirname: false,
    setImmediate: false
  },

  devtool: process.env.NODE_ENV === 'production' ? 'source-map' : 'cheap-module-eval-source-map',

  devServer: {
    port: process.env.PORT || 8090,
    host: 'localhost',
    publicPath: '/',
    contentBase: './src',
    historyApiFallback: true,
    open: true,
    proxy: {
      // OPTIONAL: proxy configuration:
      // '/optional-prefix/**': { // path pattern to rewrite
      //   target: 'http://target-host.com',
      //   pathRewrite: path => path.replace(/^\/[^\/]+\//, '')   // strip
      // first path segment }
    }
  }
}