Configuration of vue-cli for prerendering pages

vue.config.js

const path = require('path')
const webpack = require('webpack')
const PrerenderSPAPlugin = require('prerender-spa-plugin')
const Renderer = PrerenderSPAPlugin.PuppeteerRenderer

module.exports = {
  runtimeCompiler: true,
  configureWebpack: {
    resolve: {
      extensions: ['.js'],
      alias: {
        'jquery': 'jquery/dist/jquery.slim.js',
      }
    },
    plugins: [
      new webpack.ProvidePlugin({
        '$': 'jquery',
        jQuery: 'jquery',
        Popper: ['popper.js', 'default'],
        'Util': "exports-loader?Util!bootstrap/js/dist/util"
      }),
    ]
  },
  chainWebpack: (config) => {
    const svgRule = config.module.rule('svg');
    svgRule.uses.clear();
    svgRule
      .use('vue-svg-loader')
      .loader('vue-svg-loader');
    if (process.env.NODE_ENV !== 'production') {
      return;
    }
    config
      .plugin('html')
      .tap(args => {
        args[0].template =  path.join(__dirname, './public', 'index.html');
        args[0].filename =  'app.html';
          return args;
        });
  }
};

if (process.env.NODE_ENV === 'production') {
  module.exports.configureWebpack.plugins = (module.exports.plugins || []).concat([
    new PrerenderSPAPlugin({
      staticDir: path.join(__dirname, '../firebase/public'),
      outputDir: path.join(__dirname, '../firebase/public'),
      indexPath: path.join(__dirname, '../firebase/public', 'app.html'),
      assetsPublicPath: '/',
      routes: ['/', '/ru', '/en'],
      renderer: new Renderer({
        headless: true,
        renderAfterTime: 4000,
      }),
      postProcess: function(renderedRoute) {
        renderedRoute.route = renderedRoute.originalRoute
        renderedRoute.html = renderedRoute.html
          .replace(`id="app"`, `id="app" data-server-rendered="true"`)
          .replace(/<script (.*?)>/g, '<script $1 defer>')
        if (renderedRoute.route.endsWith('.html')) {
          renderedRoute.outputPath = path.join(__dirname, '../firebase/public', renderedRoute.route)
        }
        return renderedRoute;
      }
    }),
  ])
}