webpack.config.js

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

module.exports = {
  devtool: 'inline-source-map',
  mode: process.env.NODE_ENV || 'development',

  entry: fs.readdirSync(__dirname).reduce((entries, dir) => {
    const fullDir = path.join(__dirname, dir)
    const entry = path.join(fullDir, 'app.js')
    if (fs.statSync(fullDir).isDirectory() && fs.existsSync(entry)) {
      entries[dir] = ['es6-promise/auto', entry]
    }

    return entries
  }, {}),

  output: {
    path: path.join(__dirname, '__build__'),
    filename: '[name].js',
    chunkFilename: '[id].chunk.js',
    publicPath: '/__build__/'
  },

  module: {
    rules: [
      { test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader' },
      { test: /\.vue$/, loader: 'vue-loader' }
    ]
  },

  resolve: {
    alias: {
      vue: 'vue/dist/vue.esm.js',
      vuex: 'vuex/dist/vuex.esm.js',
      'vue-warehouse': path.join(__dirname, '..', 'src'),
      'vue-warehouse/sync': path.join(__dirname, '..', 'src', 'sync')
    }
  },

  // Expose __dirname to allow automatically setting basename.
  context: __dirname,
  node: {
    __dirname: true
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        default: false,
        commons: {
          test: /[\\/]node_modules[\\/]/,
          name: 'shared',
          filename: 'shared.js',
          chunks: 'all'
        }
      }
    }
  },

  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(
        process.env.NODE_ENV || 'development'
      )
    })
  ]
}