webpack.config.js

//On the command line we just need to call webpack
// which will use this config to build app.jsx and dependencies into bundle.js,
// having babel convert our jsx into js through react.

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

// Will be 'production' on heroku, but missing locallaly so we'll set to 'development'
process.env.NODE_ENV = process.env.NODE_ENV || 'development';

try {
  // Load the relevant environment vars from the config folder
  envFile(path.join(__dirname, 'config/' + process.env.NODE_ENV + '.env'));
} catch (e) {
  // Will error in production, since there is no production.env
  // Use the CLI to do the following:
  //  heroku config:set <KEY>=<VALUE>
}

module.exports = {
  entry: [
    //Where script!, (or style! or css! etc.) are used, that means use a loader, (e.g. script-loader module,) to pull in these files.
    'script!jquery/dist/jquery.min.js',
    'script!foundation-sites/dist/js/foundation.min.js',
    './app/app.jsx'
  ],
  externals: {
    jquery: 'jQuery'
  },
  plugins: [
    //If webpack finds reference to $ or jQuery in our code, load in the jquery module.
    new webpack.ProvidePlugin({
        '$': 'jquery',
        'jQuery': 'jquery'
    }),
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        warnings: false
      }
    }),
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(process.env.NODE_ENV),
        API_KEY: JSON.stringify(process.env.API_KEY),
        AUTH_DOMAIN: JSON.stringify(process.env.AUTH_DOMAIN),
        DATABASE_URL: JSON.stringify(process.env.DATABASE_URL),
        STORAGE_BUCKET: JSON.stringify(process.env.STORAGE_BUCKET),
        MESSAGING_SENDER_ID: JSON.stringify(process.env.MESSAGING_SENDER_ID)
      }
    })
  ],
  output: {
    path: __dirname,
    filename: './public/bundle.js'
  },
  resolve: {
    root: __dirname,
    modulesDirectories: [
      'node_modules',
      './app/components/',
      './app/api/'
    ],
    alias: {
      //The resolve.alias settings means we can just require <name> rather than './component/<name>'
      app: 'app', // This one lets you import anything as 'app/<folder>/<file>'
      applicationStyles: 'app/styles/app.scss',
      actions: 'app/actions/actions.jsx',
      reducers: 'app/reducers/reducers.jsx',
      configureStore: 'app/store/configureStore.jsx'
    },
    extensions: ['', '.js', '.jsx']
  },
  module: {
    loaders: [
      {
        loader: 'babel-loader',
        query: {
          presets: ['react', 'es2015', 'stage-0']
        },
        //loaders.test is a regex to see which files this loader should apply to.
        test: /\.jsx?$/,
        exclude: /(node_modules|bower_components)/
      },
      {
        test: /\.scss$/,
        loaders: ["style-loader", "css-loader", "sass-loader"]
      }
    ]
  },
  sassLoader: {
    includePaths: [
      path.resolve(__dirname, './node_modules/foundation-sites/scss')
    ]
  },
  //'eval-source-map' lets us debug the code as written, rather than in bundle.js.
  // Only applies during development, since it is a devtool setting.
  devtool: process.env.NODE_ENV === 'production' ? undefined : 'cheap-module-eval-source-map'
}