Webpack + ES6 + JSX using Babel 6

.babelrc

{
    "presets": ["es2015", "react"],
    "ignore": ["node_modules"]
}

package.json

{
  "name": "some-project",
  "version": "1.0.0",
  "dependencies": {
  },
  "devDependencies": {
    "babel-core": "^6.2.1",
    "babel-loader": "^6.2.0",
    "babel-preset-es2015": "^6.1.18",
    "babel-preset-react": "^6.1.18",
    "grunt-webpack": "^1.0.11"
  }
}

webpack.config.js

module.exports = {
    entry: './app.js',
    output: {
        path: './',
        filename: 'app.min.js'
    },
    module: {
        loaders: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                loader: "babel-loader"
            }
        ]
    }
};