webpack.config.js

var webpack = require('webpack');
var path = require('path');
var envFile = require('node-env-file');

process.env.NODE_ENV = process.env.NODE_ENV || 'development';

try {
  envFile(path.join(__dirname, 'config/' + process.env.NODE_ENV + '.env'));
} catch (e) {

}

module.exports = {

  entry: {
    app: './src/Root.js'
  },
  output: {
    filename: 'public/build/bundle.js',
    sourceMapFilename: 'public/build/bundle.map'
  },
  devtool: '#source-map',
  module: {
    loaders: [
      {
        test: /\.js?$/,
        exclude: /(node_modules)/,
        loader: 'babel',
        query: {
          presets: ['react', 'es2015']
        }
      }
    ]
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(process.env.NODE_ENV),
        API_KEY: JSON.stringify(process.env.API_KEY),
        AUTH_DOMAIN: JSON.stringify(process.env.AUTH_DOMAIN),
        DATABASE_URL: JSON.stringify(process.env.DATABASE_URL),
        STORAGE_BUCKET: JSON.stringify(process.env.STORAGE_BUCKET),
        SENDER_ID: JSON.stringify(process.env.SENDER_ID)
      }
    })
  ]


}