title: Property 'keys' does not exist on type 'any[]'
body: <p>Next example in VS2017 reported error: Property 'keys' does not exist on type 'any []'</p>
  
  <pre><code>[].keys()
  </code></pre>
  
  <p>Why error?</p>
  
  <p>Version of Visual Studio 2017  - 15.6.4</p>
  
  <p>Version of TypeScript tools - 15.6.20202.3</p>
  
  <p>Version of TypeScript - 2.8</p>