webpack.config.js

const path = require('path')
const VueLoaderPlugin = require('vue-loader/lib/plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  entry: './src/main.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js'
  },
  resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias: {
      'vue$': 'vue/dist/vue.esm.js',
      '@': path.resolve('src'),
    }
  },
  devServer: {
    contentBase: path.join(__dirname, 'dist'),
    compress: true,
    port: 3000
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      },
      {
        test: /\.vue$/,
        loader: 'vue-loader'
      },
      {
        test: /\.s?css$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'sass-loader'
        ]
      },
      {
        test: /\.pug$/,
        loader: 'pug-plain-loader'
      }
    ]
  },
  plugins: [
    new VueLoaderPlugin(),
    new HtmlWebpackPlugin({
      template: "./src/index.html",
      filename: "./index.html"
    })
  ],
}

if (process.env.NODE_ENV === 'production') {
  module.exports.entry = './src/SimpleModal.vue'
  module.exports.output.path = path.resolve(__dirname, 'build')
  module.exports.output.libraryTarget = 'commonjs2'
}

// test specific setups
if (process.env.NODE_ENV === 'test') {
  module.exports.externals = [require('webpack-node-externals')()]
  module.exports.devtool = 'eval'
  module.exports.mode = 'development'
}