webpack.config.js

const merge = require('webpack-merge');
const TARGET = process.env.npm_lifecycle_event;
const webpack = require('webpack');

const path = require('path');

const PATHS = {
  app: path.join(__dirname, 'app'),
  build: path.join(__dirname, 'build')
};


const common = {
  entry: {
    app: PATHS.app
  },
  output: {
     path: PATHS.build,
     filename: "bundle.js"
 },
 module: {
   loaders: [{
     test: /\.less$/,
     loader: 'style!css!less',
     include: PATHS.app
   },
   {
     test: /\.json$/,
     loader: 'json',
     include: PATHS.app
   },
   {
     test: /\.js$/,
     loader: 'babel',
     include: PATHS.app
   }
 ]
 },
 watch: true
};

if(TARGET === 'start' || !TARGET) {
  module.exports = merge(common, {
    devtool: 'eval-source-map',
    devServer: {
    contentBase: PATHS.build,
    historyApiFallback: true,
    hot: true,
    inline: true,
    progress: true,
    stats: 'errors-only',
    host: process.env.HOST,
    port: process.env.PORT
  },
  plugins: [
      new webpack.HotModuleReplacementPlugin()
    ]
  });
}

if(TARGET === 'build') {
  module.exports = merge(common, {});
}