webpack.prod.conf.js

process.env.NODE_ENV = 'production'

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

function resolve (dir) {
  return path.join(__dirname, '..', dir)
}

function cssLoaders (options) {
  options = options || {}

  var cssLoader = {
    loader: 'css-loader',
    options: {
      minimize: process.env.NODE_ENV === 'production',
      sourceMap: options.sourceMap
    }
  }

  // generate loader string to be used with extract text plugin
  function generateLoaders (loader, loaderOptions) {
    var loaders = [cssLoader]
    if (loader) {
      loaders.push({
        loader: loader + '-loader',
        options: Object.assign({}, loaderOptions, {
          sourceMap: options.sourceMap
        })
      })
    }

    // Extract CSS when that option is specified
    // (which is the case during production build)
    if (options.extract) {
      return ExtractTextPlugin.extract({
        use: loaders,
        fallback: 'vue-style-loader'
      })
    } else {
      return ['vue-style-loader'].concat(loaders)
    }
  }

  // http://vuejs.github.io/vue-loader/en/configurations/extract-css.html
  return {
    css: generateLoaders(),
    postcss: generateLoaders(),
    less: generateLoaders('less'),
    sass: generateLoaders('sass', { indentedSyntax: true }),
    scss: generateLoaders('sass'),
    stylus: generateLoaders('stylus'),
    styl: generateLoaders('stylus')
  }
}

const plugins = [
  // http://vuejs.github.io/vue-loader/en/workflow/production.html
  new webpack.DefinePlugin({
    'process.env': { NODE_ENV: '"production"' }
  }),
];

if (!process.env.VUE_CLI_MODERN_BUILD) {
  plugins.push(new webpack.optimize.UglifyJsPlugin({
    compress: {
      warnings: false
    },
    sourceMap: true
  }));