webpack.config.js

const merge = require('webpack-merge');
const path = require('path');
const webpack = require('webpack');
const precss = require('precss');
const autoprefixer = require('autoprefixer');

const ENV = require('./env');
const PATHS = {
  src: path.join(__dirname, 'src'),
  build: path.join(__dirname, 'www'),
};

const cssLoaders = [
  'style-loader',
  'css-loader?url=false',
  'postcss-loader',
];

const definePlugin = new webpack.DefinePlugin({
  'process.env': {
    NODE_ENV: JSON.stringify(process.env.NODE_ENV),
  },
});

process.env.BABEL_ENV = ENV;

const common = {
  entry: PATHS.src,
  output: {
    path: PATHS.build,
    filename: 'bundle.js',
  },
  resolve: {
    alias: {
      actions: `${__dirname}/src/actions/`,
      components: `${__dirname}/src/components/`,
      containers: `${__dirname}/src/containers/`,
      reducers: `${__dirname}/src/reducers/`,
      stores: `${__dirname}/src/stores/`,
      utils: `${__dirname}/src/utils/`,
    },
  },
  postcss() {
    return [autoprefixer, precss];
  },
  module: {
    loaders: [
      {
        test: /\.css$/,
        loader: cssLoaders.join('!'),
        includes: [PATHS.src, PATHS.node_modules],
      },
      {
        test: /\.jsx?$/,
        loader: 'babel?cacheDirectory',
        include: PATHS.src,
      },
      {
        include: /\.json$/,
        loaders: ['json-loader'],
      },
    ],
  },
  plugins: [definePlugin],
};

if (ENV === 'development') {
  module.exports = merge(common, {
    devServer: {
      contentBase: PATHS.build,

      // Enable history API fallback so HTML5 History API based
      // routing works. This is a good default that will come
      // in handy in more complicated setups.
      historyApiFallback: true,
      hot: true,
      inline: true,
      progress: true,

      // Display only errors to reduce the amount of output.
      stats: 'errors-only',

      // Parse host and port from env so this is easy to customize.
      host: process.env.HOST,
      port: process.env.PORT,
    },
    plugins: [
      new webpack.HotModuleReplacementPlugin(),
    ],
  });
} else {
  // config can be added here for minifying / etc
  module.exports = merge(common, {});
}