Reactが動作するサンプルプロジェクトのwebpack.config.js

webpack.config.js

const webpack = require('webpack');
const path = require('path');

// 環境を記述 development or production
const env = 'development';

const config = {
  entry: './entry.jsx',
  output: {
    path: path.join(__dirname, '/dist'),
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.jsx$/,
        exclude: /node_modules/,
        loader: 'babel-loader'
      },
    ]
  },
  resolve: {
    extensions: ['.js', '.json', '.jsx', 'css']
  },
  plugins: [
    new webpack.EnvironmentPlugin({
      NODE_ENV: env
    }),
  ],
  devtool: 'source-map'
};

// Production ビルドの場合は圧縮する
if (env === 'production') {
  config.plugins.push(
    new webpack.optimize.UglifyJsPlugin()
  );
}

module.exports = config;