npm run devbuild

build.js :

require("./check-versions")()

process.env.NODE_ENV = "production"

var ora = require("ora")
var rm = require("rimraf")
var path = require("path")
var chalk = require("chalk")
var webpack = require("webpack")
var config = require("../config/webpack")
var webpackConfig = require("./webpack.prod.conf")

var spinner = ora("building for production...")
spinner.start()

rm(path.join(config.build.assetsRoot, config.build.assetsSubDirectory), err => {
  if (err) throw err
  webpack(webpackConfig, function (err, stats) {
    spinner.stop()
    if (err) throw err
    process.stdout.write(stats.toString({
      colors: true,
      modules: false,
      children: false,
      chunks: false,
      chunkModules: false
    }) + "\n\n")

    if (stats.hasErrors()) {
      console.log(chalk.red("  Build failed with errors.\n"))
      process.exit(1)
    }

    console.log(chalk.cyan("  Build complete.\n"))
    console.log(chalk.yellow(
      "  Tip: built files are meant to be served over an HTTP server.\n" +
      "  Opening index.html over file:// won\"t work.\n"
    ))
  })
})

webpack.prod.conf.js :

var path = require("path")
var utils = require("./utils")
var webpack = require("webpack")
var config = require("../config/webpack")
var merge = require("webpack-merge")
var baseWebpackConfig = require("./webpack.base.conf")
var CopyWebpackPlugin = require("copy-webpack-plugin")
var HtmlWebpackPlugin = require("html-webpack-plugin")
var ExtractTextPlugin = require("extract-text-webpack-plugin")
var OptimizeCSSPlugin = require("optimize-css-assets-webpack-plugin")

var env = process.env.NODE_ENV === "testing"
  ? require("../config/webpack/test.env")
  : config.build.env

var webpackConfig = merge(baseWebpackConfig, {
  module: {
    rules: utils.styleLoaders({
      sourceMap: config.build.productionSourceMap,
      extract: true
    })
  },
  devtool: config.build.productionSourceMap ? "-sharpsource-map" : false,
  output: {
    path: config.build.assetsRoot,
    filename: utils.assetsPath("js/[name].[chunkhash].js"),
    chunkFilename: utils.assetsPath("js/[id].[chunkhash].js")
  },
  plugins: [
    // http://vuejs.github.io/vue-loader/en/workflow/production.html
    new webpack.DefinePlugin({
      "process.env": env
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      },
      sourceMap: true
    }),
    // extract css into its own file
    new ExtractTextPlugin({
      filename: utils.assetsPath("css/[name].[contenthash].css")
    }),
    // Compress extracted CSS. We are using this plugin so that possible
    // duplicated CSS from different components can be deduped.
    new OptimizeCSSPlugin({
      cssProcessorOptions: {
        safe: true
      }
    }),
    // generate dist index.html with correct asset hash for caching.
    // you can customize output by editing /index.html
    // see https://github.com/ampedandwired/html-webpack-plugin
    new HtmlWebpackPlugin({
      filename: process.env.NODE_ENV === "testing"
        ? "index.html"
        : config.build.index,
      template: "index.html",
      inject: true,
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
        // more options:
        // https://github.com/kangax/html-minifier-sharpoptions-quick-reference
      },
      // necessary to consistently work with multiple chunks via CommonsChunkPlugin
      chunksSortMode: "dependency"
    }),
    // keep module.id stable when vender modules does not change
    new webpack.HashedModuleIdsPlugin(),
    // split vendor js into its own file
    new webpack.optimize.CommonsChunkPlugin({
      name: "vendor",
      minChunks: function (module, count) {
        // any required modules inside node_modules are extracted to vendor
        return (
          module.resource &&
          /\.js$/.test(module.resource) &&
          module.resource.indexOf(
            path.join(__dirname, "../node_modules")
          ) === 0
        )
      }
    }),
    // extract webpack runtime and module manifest to its own file in order to
    // prevent vendor hash from being updated whenever app bundle is updated
    new webpack.optimize.CommonsChunkPlugin({
      name: "manifest",
      chunks: ["vendor"]
    }),
    // copy custom static assets
    new CopyWebpackPlugin([
      {
        from: path.resolve(__dirname, "../static"),
        to: config.build.assetsSubDirectory,
        ignore: [".*"]
      }
    ])
  ]
})

if (config.build.productionGzip) {
  var CompressionWebpackPlugin = require("compression-webpack-plugin")

  webpackConfig.plugins.push(
    new CompressionWebpackPlugin({
      asset: "[path].gz[query]",
      algorithm: "gzip",
      test: new RegExp(
        "\\.(" +
        config.build.productionGzipExtensions.join("|") +
        ")$"
      ),
      threshold: 10240,
      minRatio: 0.8
    })
  )
}

if (config.build.bundleAnalyzerReport) {
  var BundleAnalyzerPlugin = require("webpack-bundle-analyzer").BundleAnalyzerPlugin
  webpackConfig.plugins.push(new BundleAnalyzerPlugin())
}

module.exports = webpackConfig