title: If I use a typescript tuple in my react-app i get a eslint error on line 1 in vscode?
body: <p>The error is <code>Parsing error: Cannot read property 'map' of undefined</code></p>
  <p>I set up a new file just to reproduce the error:</p>
  <pre><code>export default () =&gt; {
    let something: [string, boolean]
    something = ['something', true];
  }
  </code></pre>
  <p>am i missing something? all other types seem to work fine.</p>