title: Vue + SSR webpackJsonp is not defined
body: <p>I am working on a Laravel Project wich uses VueJS.
  before I was developing only in pre-rendering way. now project almost done.
  but I wanted to support SEO, so starting to change to SSR.
  I have done V8js PHP extension.
  but the problem is in webpack.mix.js</p>
  
  <pre><code>const { mix } = require('laravel-mix');
  let webpack = require('webpack');
  mix.setPublicPath('public');
  
  mix
  .js('./src/Packages/Front/Resource/assets/js/client.js', 'public/js')
  .js('./src/Packages/Front/Resource/assets/js/server.js', 'public/js')
  </code></pre>
  
  <p>in this code, SSR no error.</p>
  
  <p>but if i add .extract(['jQuery' ]) after the mix.js() error will be come up like this.</p>
  
  <pre><code>V8Js::compileString():1: ReferenceError: webpackJsonp is not defined
  </code></pre>
  
  <p>of course, i added in this order the files</p>
  
  <pre><code>&lt;script src="{{ mix('/js/manifest.js','uyghur') }}" type="text/javascript"&gt;&lt;/script&gt;
  
   &lt;script src="{{ mix('/js/vendor.js','uyghur') }}" type="text/javascript"&gt;&lt;/script&gt;
   &lt;script src="{{ mix('/js/client.js','uyghur') }}" type="text/javascript"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>dose anyone know what exactly this error?</p>
  
  <p>it is taking my lots of time. already takes 3 days.
  I am stuck here.</p>