title: How to integrate whatwg-fetch in Gatsby
body: <p>Does anyone know how to integrate the <code>whatwg-fetch</code> fetch polyfill in gatsby?</p>
  
  <p>What I have done so far is <code>import 'whatwg-fetch';</code> in the <code>gatsby-browser.js</code>. Now I'm not sure how to add it as a first element in the webpack's <code>entry</code> property presumably in the <code>gatsby-node.js</code>.</p>