Multi Environment Webpack Config

webpack.config.base.js

import webpack from 'webpack'
import path from 'path'
import _debug from 'debug'
import ExtractTextPlugin from 'extract-text-webpack-plugin'

const ENVIRONMENT = process.env.NODE_ENV

const debug = _debug('app:webpack:base')
debug('Create configuration.')

const webpackConfig = {
  entry: {
    app: ['./client']
  },
  output: {
    publicPath: '/dist/',
    filename: '[name].bundle.js',
    path: path.join(__dirname, 'static', 'dist')
  },
  resolve: {
    modulesDirectories: ['src', 'assets', 'node_modules'],
    extensions: ['', '.js', '.jsx', 'scss']
  },
  module: {
    preLoaders: [
      {
        test: /\.(js|jsx)$/,
        loader: 'eslint',
        exclude: /node_modules/
      }
    ],
    loaders: [
      { test: /\.css$/, loader: ExtractTextPlugin.extract('style-loader', 'css-loader', 'autoprefixer-loader') },
      { test: /\.scss$/, loader: ExtractTextPlugin.extract('sass-loader', 'css-loader', 'autoprefixer-loader') },
      { test: /\.json$/, loader: 'json-loader' },
      { test: /\.(png|jpg|jpeg|gif|svg)$/, loader: 'url-loader?name=img/img-[hash:6].[ext]&limit=5000' },
      /* eslint-disable */
      { test: /\.woff(\?.*)?$/,  loader: 'url?prefix=fonts/&name=[path][name].[ext]&limit=10000&mimetype=application/font-woff' },
      { test: /\.woff2(\?.*)?$/, loader: 'url?prefix=fonts/&name=[path][name].[ext]&limit=10000&mimetype=application/font-woff2' },
      { test: /\.ttf(\?.*)?$/,   loader: 'url?prefix=fonts/&name=[path][name].[ext]&limit=10000&mimetype=application/octet-stream' },
      { test: /\.eot(\?.*)?$/,   loader: 'file?prefix=fonts/&name=[path][name].[ext]' },
      { test: /\.svg(\?.*)?$/,   loader: 'url?prefix=fonts/&name=[path][name].[ext]&limit=10000&mimetype=image/svg+xml' }
      /* eslint-enable */
    ]
  },
  plugins: [
    new webpack.DefinePlugin({
      NODE_ENV: ENVIRONMENT,
      __DEV__: ENVIRONMENT !== 'production',
      __PRODUCTION__: ENVIRONMENT === 'production'
    }),
    new webpack.optimize.OccurenceOrderPlugin(),
    new ExtractTextPlugin('[name].css', { allChunks: true })
  ]
}

export default webpackConfig

webpack.config.dev.js

import webpack from 'webpack'
import config from './webpack.config.base'
import _debug from 'debug'

const debug = _debug('app:webpack:development')
debug('Create environment configuration.')

const webpackConfig = {
  ...config,
  devtool: 'cheap-module-eval-source-map',
  entry: {
    app: [
      ...config.entry.app,
      'webpack-hot-middleware/client'
    ]
  },
  output: {
    ...config.output,
    filename: `index.js`,
    publicPath: `/`
  },
  module: {
    ...config.module,
    loaders: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel',
        query: {
          plugins: ['transform-runtime', 'add-module-exports', 'transform-decorators-legacy'],
          presets: ['es2015', 'react', 'stage-0'],
          env: {
            development: {
              plugins: [
                ['react-transform', {
                  // omit HMR plugin by default and _only_ load in hot mode
                  transforms: [{
                    transform: 'react-transform-hmr',
                    imports: ['react'],
                    locals: ['module']
                  }, {
                    transform: 'react-transform-catch-errors',
                    imports: ['react', 'redbox-react']
                  }]
                }]
              ]
            }
          }
        }
      },
      ...config.module.loaders
    ]
  },
  plugins: [
    ...config.plugins,
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoErrorsPlugin()
  ]
}

export default webpackConfig

webpack.config.prod.js

import webpack from 'webpack'
import config from './webpack.config.base'
import _debug from 'debug'

const debug = _debug('app:webpack:production')
debug('Create environment configuration.')

const webpackConfig = {
  ...config,
  devtool: 'source-map',
  output: {
    ...config.output,
    filename: `[name].bundle.js`
  },
  module: {
    ...config.module,
    loaders: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: 'babel'
      },
      ...config.module.loaders
    ]
  },
  plugins: [
    ...config.plugins,
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        warnings: false
      }
    })
  ]
}

export default webpackConfig