webpack.config.js

const path = require('path')
const webpack = require('webpack')
const merge = require('webpack-merge')
const validate = require('webpack-validator')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const BrowserSyncPlugin = require('browser-sync-webpack-plugin')

const ROOT_PATH = path.resolve(__dirname)
const SRC_PATH = path.resolve(ROOT_PATH, 'src')
const BUILD_PATH = path.resolve(ROOT_PATH, 'public')

const common = {
  entry: [
    'whatwg-fetch',
    SRC_PATH
  ],
  output: {
    filename: 'bundle.js',
    path: BUILD_PATH,
    publicPath: '/'
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.resolve(SRC_PATH, 'index.html'),
      inject: 'body',
      filename: 'index.html'
    }),
    new webpack.DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development')
      }
    })
  ],
  module: {
    loaders: [{
      test: /\.js$/,
      include: [SRC_PATH],
      loader: 'babel'
    }, {
      test: /\.(png|jpe?g|gif|svg|mp4)$/,
      loader: 'file'
    }, {
      test: /\.(sass|s?css)$/,
      loaders: [
        'style',
        'css',
        'postcss',
        'sass'
      ]
    }, {
      test: /\.(graphql|gql)$/,
      exclude: /node_modules/,
      loader: 'graphql-tag/loader'
    }]
  },
  postcss: () => {
    return [
      require('autoprefixer')
    ]
  }
}

const development = {
  entry: [
    'react-hot-loader/patch',
    'webpack-dev-server/client?http://localhost:8080',
    'webpack/hot/only-dev-server'
  ],
  output: {
    devtoolModuleFilenameTemplate: '[absolute-resource-path]'
  },
  devServer: {
    historyApiFallback: true,
    hot: true,
    stats: { colors: true, chunks: false }
  },
  devtool: 'eval',
  plugins: [
    new webpack.HotModuleReplacementPlugin({ multiStep: true }),
    new BrowserSyncPlugin({ proxy: 'http://localhost:8080/' }, { reload: false })
  ],
  module: {
    loaders: [{
      test: /\.html$/,
      loader: 'raw'
    }]
  }
}

const production = {
  plugins: [
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({ compress: { warnings: false } })
  ]
}

module.exports = validate(merge.smart(
  process.env.npm_lifecycle_event === 'build'
  ? production
  : development,
  common
))