webpack.config.js

var path = require('path')
var webpack = require('webpack')

// webpack.config.js
const VueLoaderPlugin = require('vue-loader/lib/plugin')

module.exports = {
  mode: 'development',
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, './dist'),
    publicPath: 'dist/',
    filename: 'vue-tree.js',
    library: 'vue-tree',
    libraryTarget: 'umd',
    umdNamedDefine: true
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          loaders: {
          }
          // other vue-loader options go here
        }
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.css$/,
        use: [{
          loader: "style-loader" // creates style nodes from JS strings
        }, {
          loader: "css-loader" // translates CSS into CommonJS
        }]
      },
      {
        test: /\.styl(us)?$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'stylus-loader'
        ]
      }, 
      {
        test: /\.(png|jpg|gif|svg|woff|woff2|eot|ttf)$/,
        loader: 'file-loader',
        options: {
          name: '[name].[ext]'
        }
      },
    ]
  },
  resolve: {
    alias: {
      'vue$': 'vue/dist/vue.esm.js'
    }
  },
  devServer: {
    historyApiFallback: true,
    noInfo: true,
    host: '0.0.0.0', // can be overwritten by process.env.HOST
    port: 8000, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
    watchOptions: {
      poll: 1000,
    }
  },
  performance: {
    hints: false
  },
  devtool: '#eval-source-map',
  plugins: [
    new VueLoaderPlugin()
  ],
}

if (process.env.NODE_ENV === 'production') {
  module.exports.entry = './src/index.js';
  module.exports.mode = 'production'
  module.exports.devtool = '#source-map'
  // http://vue-loader.vuejs.org/en/workflow/production.html
  module.exports.optimization = { minimize: true }
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: true
    })
  ])
}