title: Heroku won't install my dev dependencies with NPM_CONFIG_PRODUCTION=false
body: <p>It refuses to do it although it set </p>
  
  <pre><code>NPM_CONFIG_PRODUCTION=false
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Ph7MH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ph7MH.png" alt="Config variables section of the dashboard"></a></p>
  
  <p>Do I have to do an extra action in the dashboard?</p>