Webpack config for es6 and rails, with linter

.eslintrc

{
  "parser": "babel-eslint",
  "plugins": [
    "react"
  ],
  "env": {
    "browser": true,
    "node": true
  },
  "rules": {
    "new-cap": 0,
    "no-debugger": 0,
    "strict": [2, "never"],
    "quotes": [2, "single"],
    "react/jsx-boolean-value": 1,
    "react/jsx-quotes": 1,
    "react/jsx-no-undef": 1,
    "react/no-did-mount-set-state": 1,
    "react/no-did-update-set-state": 1,
    "react/no-multi-comp": 1,
    "react/prop-types": 1,
    "react/self-closing-comp": 1,
    "react/wrap-multilines": 1
  },
  "globals": {
    "FIREBASE": true
  }
}

webpack.config.js

/**
 * @see http://webpack.github.io/docs/configuration.html
 * for webpack configuration options
 */
var path = require('path');
var node_modules_dir = path.join(__dirname, 'node_modules');
var javascripts_path = path.join(__dirname, 'app', 'assets', 'javascripts');

module.exports = {
  devtool: 'inline-source-map',
  entry: path.join(javascripts_path, '_application.js'),
  output: {
    filename: '[name].bundle.js',
    path: javascripts_path
  },
  module: {
    preLoaders: [{
      test: /\.js$/,
      loader: 'eslint-loader',
      include: javascripts_path,
      exclude: [node_modules_dir]
    }],
    loaders: [{
      test: /\.js$/,
      loaders: ['babel?stage=0&optional=runtime'],
      include: javascripts_path,
      exclude: [node_modules_dir]
    }]
  }
};