webpack.config.js

const webpack = require('webpack')

module.exports = function (env) {
  const entryPath = '/src/index.js'
  let uglifyPlugin = []

  uglifyPlugin.push(new webpack.optimize.UglifyJsPlugin())

  return {
    context: __dirname,
    entry: __dirname + entryPath,
    output: {
      path: __dirname + '/dist',
      filename: 'index.js',
      library: 'VueInitialsImg',
      libraryTarget: 'umd'
    },
    devServer: {
      contentBase: __dirname + '/test'
    },
    module: {
      rules: [{
          test: /\.vue$/,
          exclude: /node_modules/,
          use: [{
              loader: 'vue-loader',
              options: {
                postcss: [require('postcss-cssnext')()]
              }
            },
          ]
        },
        {
          test: /\.js$/,
          exclude: /node_modules/,
          use: [
            'babel-loader',
            'eslint-loader'
          ]
        }
      ]
    },
    plugins: [
      ...uglifyPlugin,
      //  define the vue enviroment.
      new webpack.DefinePlugin({
        'process.env': {
          NODE_ENV: JSON.stringify(env)
        }
      })
    ]
  }
}