webpack.demo.js

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

module.exports = {
  entry: './demo/src/main.js',
  output: {
    path: path.resolve(__dirname, './demo/dist'),
    publicPath: '/demo/dist/',
    filename: 'build.js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader'
        ],
      },      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          loaders: {
          }
          // other vue-loader options go here
        }
      },
      {
        test: /\.js$/,
        use:{
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            "env": {
              "test": {
                "plugins": ["istanbul"]
              }
            }
          }
        },
        exclude: /node_modules/
      },
      // {
      //   test: /\.(png|jpg|gif|svg)$/,
      //   loader: 'file-loader',
      //   options: {
      //     name: '[name].[ext]?[hash]'
      //   }
      // }
    ]
  },
  mode:'development',
  resolve: {
    alias: {
      'vue$': 'vue/dist/vue.esm.js'
    },
    extensions: ['*', '.js', '.vue', '.json']
  },
  devtool: '#eval-source-map',
  devServer: {
    // inline: false
  },
  plugins: [
    new VueLoaderPlugin()
  ]
}

if (process.env.NODE_ENV === 'production') {
  module.exports.devtool = 'none'
  module.exports.mode = 'production'
  // http://vue-loader.vuejs.org/en/workflow/production.html
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
  ])
}