title: Why JSON.stringify('production')?
body: <p>In the <a href="https://webpack.js.org/guides/production/#specify-the-environment" rel="noreferrer">Webpack Production Documentation</a>, one recommendation is to instantiate the object with a configuration variable for process.env.NODE_ENV, with the following recommended code:</p>
  
  <pre><code>+     new webpack.DefinePlugin({
  +       'process.env.NODE_ENV': JSON.stringify('production')
  +     })
  </code></pre>
  
  <p>Why <code>JSON.stringify('production')</code> and not just merely <code>'production'</code>?</p>