title: Nuxt command line pass arguments
body: <p>I want to pass some arguments to <code>nuxt</code> command line like:</p>
  
  <pre><code>nuxt --myvar a
  </code></pre>
  
  <p>How to read this <code>myvar</code> inside <code>nuxt.config.js</code>?</p>
  
  <p>I need this because I have 3 <code>.env</code> (localhost, production and development) files, but with current <code>NODE_ENV</code> I can use only 2 (production and development).</p>